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{{alert|This page is an edit and testing page use by the wiki authors.  It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.|alert-danger}}
 
{{alert|This page is an edit and testing page use by the wiki authors.  It is not a content page for the Manual. Information on this page may not be accurate and should not be used as guidance in managing stormwater.|alert-danger}}
  
[[Coir and applications of coir in stormwater management]]
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[[Main page test]]
  
=Coir=
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== ==
This page provides information on coir. While providing extensive information on coir, there is a section focused specifically on stormwater applications for coir.
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[[Table of Contents test page]]
  
==Overview and description==
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[[File:Coir fiber.jpg|300px|thumb|alt=image of coir fiber|<font size=3>A close-up view of coir fibre, by [https://commons.wikimedia.org/wiki/User:Fotokannan Fotokannan], licensed under CC CC BY-NC-SA</font size>]]
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Coconut (''Cocus nucifera'' L.) pith or coir, the mesocarp of the fruit, is a waste product that has potential benefits in growth media. Coir dust is peat-like and consists of short fibres (< 2 cm). Coir has a large surface area per unit volume, is hydrophilic, and therefore has the ability to absorb water.  
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==section==
 
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<div class="mw-collapsible mw-collapsed" style="width:100%">
There are three basic types of coir material.
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*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Best_Management_practices Best management practices]
#Coco pith is a rich, brown color and has a high water retention capacity.
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:*<span title="This category contains four subcategories: Erosion control practices, sediment control practices, construction tables, and fact sheets"> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Construction_practices '''Construction practices''']</span>
#Coco fibers are stringy bundles that does not readily retain water and will break down over time.
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<div class="mw-collapsible-content">'''
#Coco chips are small chunks of coir that combine the properties of the peat and fiber. Coco chips retain water well and also allow for air pockets.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Construction_practices/Erosion_prevention_practices Erosion prevention practices]
 
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Construction_practices/Fact_or_summary_sheet Fact sheets and summary sheets]
Coir production involves separating the husk from the shelled nut and soaking the husk in water. The fibers are then separated from the pith and the resulting material is screened to create a uniform particle size. A dust is created during this process and the dust may be air dried and packaged.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Construction_practices/Sediment_control_practices Sediment control practices]
 
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</div>
Coir benefits may include but are not limited to the following.
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*:<span title="This page provides links to pages providing cost-benefit information for stormwater best management practices"> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Cost_benefit '''Cost benefit information''']</span>
*Coir has a neutral pH
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:*<span title="This page (Category) contains a mixture of subcategories and pages that provide general and technical guidance and information on stormwater best management practices. This does not include specifications and detail (e.g. design, construction, O&M)."> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Guidance_and_information '''Guidance and information''']</span>
*Coir improves water holding capacity of soil
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<div class="mw-collapsible-content">'''
*Coir may improve drainage in fine-textured soils by creating pore spaces as it degrades
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Guidance_and_information/BMP_overview Overviews of bmps]
*Coir increases the organic matter content of soil, which can improve soil structure and aggregation
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Guidance_and_information/BMP_types_and_terminology BMP types and terminology]
*Coir production is sustainable and therefore does not contribute to greenhouse gas emissions.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Guidance_and_information/Pollutant_removal_and_credits Pollutant removal and credits for bmps]
 
+
</div>
 
+
:*<span title="Nonstructural stormwater practices are typically not permanent, physical devices or structures but implementation of these practices reduces pollutant loading. Subcategories in this category include better site design, deicing, education, pollution prevention, and street sweeping."> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Nonstructural_practices '''Nonstructural practices''']</span>
[[Chemical and physical properties of coir]]
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<div class="mw-collapsible-content">'''
 
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Nonstructural_practices/Better_site_design Better site design]
 
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Nonstructural_practices/Deicing Deicing]
 
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Nonstructural_practices/Education Education]
<!--
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Nonstructural_practices/Harvest_and_reuse Harvest and reuse]
==Applications for biochar in stormwater management==
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Nonstructural_practices/Pollution_prevention Pollution prevention]
Biochar has several potential applications for stormwater management. Below is a brief review of what we know about biochar.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Nonstructural_practices/Street_sweeping Street sweeping
*Biochar increases water holding capacity of soil, improves aggregation in fine-textured soils, increases saturated hydraulic conductivity in fine- and medium-textured soils, and decreases hydraulic conductivity in very coarse-textured soils.
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</div>
*Improve the fertility of nutrient-poor soils. In nutrient-poor soils, biochar appears to consistently improve nutrient cycling and availability for plants. Results for other soils are mixed and depend on the biochar and soil characteristics.
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:*<span title="Pretreatment practices remove trash, debris, organic materials, coarse sediments, and associated pollutants from runoff prior to entering structural stormwater BMPs. This category includes subcategories on different pretreatment practices, including filtration, settling, screening, and hydrodynamic separation practices."> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Pretreatment_practices '''Pretreatment practices''']</span>
*Biochar generally improves retention of metals and PAHs.
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<div class="mw-collapsible-content">'''
*Results for bacteria and pathogens are mixed, but some studies indicate increased retention, primarily associated with straining resulting from increased surface area and micropore structure in biochar-amended soils.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Pretreatment_practices/Hydrodynamic_separation_devices Hydrodynamic separators]
*Biochar is likely to have limited effects on phosphorus retention unless specifically amended to retain phosphorus.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Pretreatment_practices/Other_pretreatment_practices Other pretreatment practices]
 
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Pretreatment_practices/Screening_and_straining_devices Screening and straining practices]
Possible implications for stormwater management include the following.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Pretreatment_practices/Filtration_devices Filtration practices]
#'''Engineered media'''. Biochar incorporated into engineered media can increase water retention and infiltration. Low-nutrient biochars (e.g. wood-based versus manure- or sludge-based) produced at relatively low temperatures (less than 600<sup>o</sup>C) can improve phosphorus retention. Biochar may enhance nutrient cycling and improve fertility in media with relatively low nutrient concentrations (e.g. media mixes having lower fractions of compost).
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Pretreatment_practices/Settling_devices Settling devices]
#'''Contaminant hotspots'''. Biochar can be incorporated into treatment practices in areas with high or potentially high concentrations of metals and organic pollutants.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Pretreatment_practices/Tables Tabled information]
#'''Turf amendment/soil compaction'''. Biochar can added to turf or compacted media to improve hydraulic performance and nutrient cycling.
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</div>
#'''Filtration practices'''. Biochar can be used alone or mixed with other components for stormwater filtration applications, including but not limited to the following:
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:*<span title="This category provides links to information on how to design, construct/build, operate and maintain, and assess the performance of bmps. Numerous tables and images in this manual provide specifications and details."> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Specifications_and_details '''Specifications and details''']</span>
##Filtration media in new treatment systems, especially roof downspout units and aboveground vaults;
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<div class="mw-collapsible-content">'''
##Supplemental or replacement media in existing treatment systems such as sand filters;
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Specifications_and_details/Assessing_performance Assessing performance]
##Direct media addition to a stormwater storage vault ;
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Specifications_and_details/Construction_specifications Construction specifications and recommendations]
##Direct application in bioretention or swale systems;
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Specifications_and_details/Design_criteria Design criteria and recommendations]
##Filtration socks and slings;
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Specifications_and_details/Images_and_CADD Images and CADD]
##Hanging filters in catch basins.
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::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Specifications_and_details/Operation_and_maintenance Operation and maintenance]
#'''Underground infiltration basins and trenches'''. Many underground infiltration practices are constructed in very coarse textured soils that may have limited ability to retain pollutants. Biochar can reduce infiltration rates and adsorb pollutants in these systems.
 
#'''Climate-related effects'''. While not specifically a stormwater objective, biochar incorporated into stormwater practices can sequester carbon and reduce nitrous oxide emissions.
 
 
 
{{:Potential biochar stormwater applications}}
 
 
 
Further reading
 
*[https://pprc.org/wp-content/uploads/2014/08/Emerging-Stormwater-BMPs_Biochar-as-Filtration-Media_2014.pdf Emerging Best Management Practices in Stormwater: Biochar as Filtration Media] - Pacific Northwest Pollution Prevention Resource Center
 
*[Ihttps://www.deeproot.com/blog/blog-entries/improving-stormwater-control-measure-performance-with-biochar Improving Stormwater Control Measure Performance with Biochar] - Deeproot
 
*[http://onlinepubs.trb.org/onlinepubs/IDEA/FinalReports/Highway/NCHRP182_Final_Report.pdf Reducing Stormwater Runoff and Pollutant Loading with Biochar Addition to Highway Greenways] - Final Report for NCHRP IDEA Project 182
 
*Mohanty et al. (2018)
 
 
 
==Effects of feedstock and production temperature==
 
Although the basic structure of all biochars is similar, the physical-chemical properties of biochar varies with the source material and with the temperature used in production.
 
 
 
===Effect of feedstock (source material)===
 
Since a wide variety of organic material can be used to produce biochar, it is not feasible to discuss each material separately. We provide the following general conclusions. Literature used to develop these conclusions is provided at the end of this section.
 
*Compared to wood derived biochar, non-wood feedstock such as grass, sludge, and manure yields biochar with fewer aromatic but more aliphatic groups and higher ash content. Greater concentrations of aliphatic compounds are associated with more reactive biochar.
 
*Manure- and sludge-based biochar contains higher concentration of nutrients than wood-based biochar and are therefore more likely to be a source of nutrient leaching.
 
*Manure- and sludge-based biochar attenuate metals more than wood based biochars
 
*Biochar parameters most affected by feedstock properties are total organic carbon, fixed carbon, and mineral elements of biochar. Feedstocks such as sawdust, wheat straw, and peanut shell have higher carbon concentrations than feedstocks such as manure, sludges, and waste paper.
 
*Capacity for carbon sequestration is primarily affected by feedstock, with higher carbon compounds having greater sequestration capacity.
 
*High ash biochars, such as manures and coffee husk, exhibit higher cation exchange capacity, which may increase nutrient capture, although high initial nutrient concentrations may offset this and even contribute to nutrient loss.
 
 
 
The [https://biochar-international.org/wp-content/uploads/2019/11/IBI_Biochar_Standards_V2.1_Final1.pdf International Biochar Initiative (see Appendix 6)] proves a classification system for biochar feedstocks, shown below.
 
*Unprocessed Feedstock Types
 
**Rice hulls & straw
 
**Maize cobs & stover
 
**Non-maize cereal straws
 
**Sugar cane bagasse & trash
 
**Switch grass, Miscanthus & bamboo
 
**Oil crop residues e.g., sugar beet, rapeseed
 
**Leguminous crop residues e.g., soy, clover
 
**Hemp residues
 
**Softwoods (coniferous)
 
**Hardwoods (broadleaf)
 
*Processed Feedstock Types
 
**Cattle manure
 
**Pig manure
 
**Poultry litter
 
**Sheep manure
 
**Horse manure
 
**Paper mill sludge
 
**Sewage sludge
 
**Distillers grain
 
**Anaerobic digester sludge
 
**Biomass fraction of MSW – woody material
 
**Biomass fraction of MSW – yard trimmings
 
**Biomass fraction of MSW – food waste
 
**Food industry waste
 
 
 
'''Literature'''
 
*Zhaoa et al. (2013) examined cow manure, pig manure, shrimp hull, bone dregs, wastewater sludge, waste paper, sawdust, grass, wheat straw, peanut shell, Chlorella, and water weeds
 
*Rimena et al., (2017) examined wood-based biochars (eucalyptus sawdust, pine bark), sugarcane bagasse, chicken manure, and coffee husk
 
*Jindo et al. (2014) examined rice husk, rice straw, apple tree wood chips, and oak tree wood chips
 
*Mohanty et al. (2018) provide an extensive discussion and literature review of different feedstocks and associated biochar properties
 
*Gai et al. (2014) studied twelve biochars produced from wheat straw, corn straw, and peanut shell
 
*[https://biochar-international.org/biochar-feedstocks/ International Biochar Initiative] provide a general discussion of feedstocks
 
*Conz et al. (2017) studied poultry litter, sugarcane straw, rice hull and sawdust
 
*[https://extension.tennessee.edu/publications/Documents/W829.pdf Jahromi and Fulcher] studied biosolids and green waste, corn straw and rice straw, gasifed rice hulls, hardwood, pelleted agricultural or forestry residues, switchgrass, and timber harvest residues
 
*Zhao et (2019) studied sewage sludge, agriculture biomass waste, and wood biomass waste
 
 
 
===Effect of production temperature===
 
Changes in the properties of biochar result from loss of volatile organic matter as temperature increases. This leads to a gradual loss in the number of functional groups on the biochar and increased aromaticity as temperature increases.
 
 
 
In general, the following conclusions are applicable for biochar used in stormwater applications.
 
*If retention of nutrients and most pollutants is desired, biochars produced at temperatures less than 600<sup>o</sup>C should be selected
 
*If the goal is to improve soil physical or hydraulic properties biochars produced at temperatures greater than 600<sup>o</sup>C should be selected
 
 
 
The following information comes from a literature review of the effects of production temperature on biochar
 
*Biochar yield and contents of N, hydrogen and oxygen decrease as pyrolysis temperature increases from 400˚C to 700˚C
 
*pH and contents of ash and carbon increase with greater pyrolysis temperature.
 
*Particle size and porosity increase with greater pyrolysis temperature.
 
*Hydrophobicity increases with greater pyrolysis temperature.
 
 
 
'''Literature'''
 
*Mohanty et al., (2018)
 
*Zhaoa et al., (2013)
 
*Klasson, (2017)
 
*Zhao et al., (2017)
 
*Jindo et al., (2014)
 
*Wang et al., (2018)
 
*Rimena et al., (2017)
 
*Lyu et al. (2016)
 
*Gai et al.. (2014)
 
*Conz et al. (2017)
 
 
 
==Properties of biochar==
 
This section includes a discussion of chemical and physical properties of biochar, and potential contaminants in biochar, .
 
 
 
===Chemical-physical properties of biochar===
 
The properties of biochar vary depending on the feedstock and production temperature, as discussed above. Consequently there is considerable variability in the chemical and physical properties of different biochars. The table below summarizes data from our literature review. Some conclusions from the literature are summarized below.
 
*'''Biochar has a large surface area.'''
 
*'''Cation exchange capacity (CEC) decreases as pyrolysis temperature increases'''. This is due to the loss of volatile organic content and associated functional groups as temperature increases. As CEC decreases, the ability of biochar to retain negatively charged chemicals, such as phosphate, decreases.
 
*'''Non-wood vegetative feedstocks have a greater CEC than wood feedstocks.''' This is due to a greater percentage of aliphatic compounds and associated functional groups. Non-wood feedstocks primarily consist of grasses.
 
*'''Sludges and manure-based biochars have high nutrient content and are thus not satisfactory for managing stormwater'''
 
 
 
{{:Chemical and physical properties of biochar}}
 
 
 
===Potential contaminants in biochar===
 
Potential contaminants associated with biochar are a function of the source material and production temperature. Of greatest concern are metals and polycyclic aromatic hydrocarbons (PAHs). Oleszcuk et al. (2013) examined metal and PAH concentrations in four biochars (elephant grass, coconut shell, wicker, and wheat straw). Metal concentrations (mg/kg) in the biochars are summarized below. Tier 1 Soil Reference Values (SRVs) are included in parentheses.
 
*Cd: 0.04-0.87 (25)
 
*Cu: nd-3.81 (100)
 
*Ni: nd-9.95 (560)
 
*Pb: 20.6-23.7 (300)
 
*Zn: 30.2-102.0 (8700)
 
*Cr: nd-18.0 (44,000 for CrIII; 87 for CrVI)
 
 
 
Concentrations in biochar are well below Tier 1 SRVs.
 
 
 
In the study by Oleszcuk et al. (2013), total PAHs ranged from 1124.2 ng/g to 28339.1 ng/g. The dominant group of PAHs were 3-ring compounds which comprised 64.6% to 82.6% of total PAHs content. The primary compounds included, in order of abundance, phenanthrene, fluorene, anthracene, and pyrene. No 6-ring PAHs were observed. Concentrations of PAHs and other organic contaminants, such as dioxins, decreases with increasing pyrolysis temperature (Lyu et al., 2016).
 
 
 
In general, biochars mixed with soil do not inhibit germination or root growth. Biochar may enhance soil fertility by providing nutrients or more commonly by slowing the release of nutrients from materials such as compost. was observed. Toxic effects have been observed for some invertebrates, indicating that in sensitive environments, biochar testing is advisable (Oleszcuk et al., 2013; Getz et al., 2018; Flesch et al., 2019; Wang et al., 2017) .
 
 
 
==Effects of biochar on physical and chemical properties of soil and bioretention media==
 
In this section we provide information on effects of biochar on pollutant attenuation and the physical properties of soil and bioretention media.
 
 
 
===Effect of biochar on retention and fate of phosphorus===
 
<div style="float:right">
 
<table class="infobox" style="border:3px; border-style:solid; border-color:#FF0000; text-align: right; width: 300px; font-size: 100%">
 
<tr>
 
<td>'''Biochar is not likely to provide significant phosphorus retention in bioretention practices unless impregnated with cations (e.g. magnesium) during production at relatively low temperatures (e.g. less than 600<sup>o</sup>C.)'''
 
</td>
 
</tr>
 
</table>
 
 
</div>
 
</div>
 
+
:*<span title="This page (Category) provides links to pages and subcategories that provide information on structural best management practices, including bioretention, tree trenches, swales, media filters, infiltration practices, permeable pavement, green roof, harvest/reuse, and manufactured treatment practices."> [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Structural_practices '''Structural practices''']</span>
Biochar may have several properties for managing stormwater, such as increased water and pollutant retention, improving soil physical properties, and attenuating bacteria and pathogens. Biochar has been examined as a potential amendment to engineered media in bioretention or other stormwater control practices. With respect to phosphorus, information from the literature is mixed. Below are summaries from several studies.
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<div class="mw-collapsible-content">'''
*Mohanty et al. (2018) observed that biochar does not absorb phosphate efficiently. Phosphorus retention can be enhanced by impregnating biochar with cations such as magnesium and zinc.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Bioretention Bioretention]
*Reddy et al. (2014) found that biochar reduced influent phosphate concentrations by 47% in column experiments. Influent concentrations were 0.57 and 0.82 mg/L for unwashed and washed biochar, respectively. These concentrations are on the high end of concentrations found in urban stormwater.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Constructed_wetland Constructed wetland]'''
*Yaoa et al. (2011) observed retention in biochar-(sugar beet source)amended soils that were fertilized. Adsorption was dominated by magnesium oxides and maximum adsorption occurred at pH values less than 4.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Dry_swale Dry swale]
*Zhaoa et al. (2013) studied different feedstocks and observed high phosphorus concentrations in animal-based feedstocks and wastewater sludge (0.065 - 0.44%) compared to other feedstocks (0.007 - 0.07%)
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Green_roof Green roof]
*Iqbal et al. (2015) examined leaching of phosphorus from compost (80% yard and 20% food waste) and co-composted biochar (100% fir-forest slash). They found biochar amendments did not significantly reduce the leaching of phosphorus compared to the compost only treatment. Phosphorus leached from biochar, but because phosphorus concentrations in biochar are low, this leaching contributed little total phosphorus. Leached phosphorus was primarily in the form of orthphosphate.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Infiltration_(trench/basin) Infiltration trench/basin]
*Han et al. (2018) found that addition of biochar to soil led to increased desorption of phosphorus during winter freeze-thaw cycles.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Iron_enhanced_sand_filter Sand filter]
*Soinne et al. (2014) observed no effect of biochar on phosphorus retention in a sandy and two clay soils.
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Permeable_pavement Permeable pavement]
 
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Proprietary_devices Proprietary devices]
===Effect of biochar on retention and fate of other pollutants===
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Sand_filter,_iron_enhanced_sand_filter,_media_filter Iron enhanced sand filter]
*'''Nitrogen'''. Biochar effects on nitrogen retention depend on the properties of the biochar and stormwater runoff. Biochars produced at relatively low temperatures (less than 600<sup>o</sup>C) provide some retention of organic nitrogen and ammonium nitrogen in stormwater runoff. Mechanisms for nitrogen retention include adsorption of ammounium and nitrogen immobilization. Leaching of nitrogen may decrease due to increased water holding capacity (Iqbal et al., 2015; Gai et al., 2014; Zheng et al., 2013; Ding et al., 2010).
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Step_pool Step pool swale]
*'''Metals'''. Biochar enhance retention of metals in stormwater runoff. (Reddy et al., 2014; Domingues et al., 2017; Iqbal et al., 2015)
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Stormwater_wetland Stormwater wetland]
*'''Organics'''. Biochar significantly retains polynuclear aromatic hydrocrabons in stormwater runoff (Reddy et al., 2014;  Domingues et al., 2017; Ulrich et al., 2017; Iqbal et al., 2015)
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Tree_trench_and_box Tree trench/box]
*'''Bacteria and viruses'''. Biochar effects on bacteria and virus retention are a function of the particle size of the biochar. Fine-grained biochars enhance removal of bacteria in stormwater runoff through straining of microorganisms (Reddy et al., 2014; Sasidharan et al., 2016; Yang et al., 2019).
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Wet_pond Wet pond]
*'''Dissolved organic carbon'''. Biochar shows limited retention of dissolved carbon in stormwater runoff (Iqbal et al., 2015).
+
::*[https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Best_management_practices/Structural_practices/Wet_swale Wet swale]
*'''Greenhouse gas emissions'''. Biochar effectively sequesters carbon and reduces loss of greenhouse gases when incorporated into soil or media, particularly soil with high organic matter content (Zhaoa et al., 2013; Mohanty et al., 2018; 37. Agyarko-Mintah et al., 2017).
 
 
 
===Effect of biochar on soil physical and hydraulic properties===
 
Because of a large surface area and internal porosity, biochar can affect soil physical properties (Mohanty et al., 2018; Herrera Environmental Consultants, 2015; Iqbal et al., 2015; Imhoff, 2019; Jien and Wang, 2013). These effects are most pronounced in soils with low organic matter concentration.
 
 
 
*'''Porosity and surface area'''. Biochar significantly increases the porosity of most soils.
 
*'''Water holding capcity'''. Biochar significantly increases the water holding capacity of soil.
 
*'''Hydraulic conductivity'''. Biochar increases the hydraulic conductivity of fine- and medium-grained soils and may decrease the hydraulic conductivity of coarse-grained soils.
 
*'''Structure'''. Biochar enhances aggregation in soils, thus enhancing soil structure and potentially increasing soil macroporosity.
 
 
 
===Effects of biochar on soil fertility, plant growth, and microbial function===
 
<div style="float:right">
 
<table class="infobox" style="border:3px; border-style:solid; border-color:#FF0000; text-align: right; width: 300px; font-size: 100%">
 
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<td>'''Effects of biochar on soil fertility, plant growth, and microbial function are affected by several factors, including feedstock, production method, soil, application rate, and biochar age. Biochar has few negative effects on fertility, plant growth and microbial function and in many cases has the potential to greatly improve soil physical, chemical and biological conditions.'''
 
</td>
 
</tr>
 
</table>
 
 
</div>
 
</div>
  
DeLuca et al. (2015) provide an extensive discussion of biochar effects on nutrient cycling, fertility, and microbial function in soil. Their paper is based on an extensive review of the literature at the time of their publication. The following discussion is primarily based on information contained in this document. A list of suggested articles is provided at the end of this section.
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Image:Topics image map.png|500px|thumb|alt=imagemap for stormwater BMPs|'''Stormwater Topics found in this stormwater wiki'''. Mouse hover over an '''i''' box to read a description of the practice, or click on an '''i''' box to go to a page on the practice.
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circle 130 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Best_Management_practices Best management practices treat or reduce stormwater volume through infiltration, filtration, sedimentation, chemical interaction, and prevention. Examples include bioretention (raingardens), swales, ponds, street sweeping, and pretreatment filtering and settling.]
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circle 400 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Specifications_and_details Specifications and details include guidance and images, including details, on how to design, construct, maintain, and assess stormwater best management practices]
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circle 700 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Regulatory/Construction_(CSW) Information on the construction stormwater permit, technical information on construction stormwater best management practices, and links to photos, images, and tables]
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circle 1000 195 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Regulatory/Municipal_(MS4) Information on the municipal (MS4) stormwater permit, technical information on post-construction stormwater best management practices, and links to photos, images, and tables]
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circle 1250 190 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Regulatory/Municipal_(MS4)/TMDLs Links to information on total maximum daily loads, including regulatory guidance and information, examples, and tools]
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circle 1550 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Pollutants Information on pollutants includes pollutant-specific information on phosphorus, solids, bacteria and pathogens, and chloride; information on pollutant removal; and information on pollutants in stormwater runoff]
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circle 130 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Technical_and_specific_topic_information/soils_and_media Information on soils and engineered media used in stormwater applications, including soil processes and properties, measuring and assessing soils, media mixes, media applications and performance, and amendements such as iron and biochar]
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circle 400 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Technical_and_specific_topic_information/infiltration Information on infiltration of stormwater runoff, including best management practices, constraints on infiltration, evaluating the potential for infiltration, effects on groundwater, and case studies]
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circle 700 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Technical_and_specific_topic_information/vegetation Information on applications of vegetation in stormwater management, including planning for vegetation at a site, establishment and maintenance, and plant lists and selection]
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circle 1000 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Management/Green_infrastructure Information on green infrastructure and green stormwater infrastructure, including definitions, example and best management practices, operatyion and maintenance, planning, multiple benefits, and case studies]
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circle 1250 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Management/MIDS Minimal Impact Design Standards, including definitions, documents, processes, performance goals, and calculator information, including examples, applications, and supporting information for the calculator]
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circle 1550 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Management/Winter_management Winter management as it applies to stormwater management, including deicing, chloride, best management practice design and performance, and snow management]
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circle 130 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Models,_modeling,_and_monitoring Models, monitoring, and monitoring guidance, including information on specific models, links, and case studies/applications]
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circle 400 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Case_studies_and_examples Case studies and examples for a wide range of stormwater topics]
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circle 700 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Images The stormwater wiki has about 2000 images, including photos, schematics, graphs, and more]
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circle 1000 700 30 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Tables There are more than 600 tables with information on a wide variety of stormwater topics]
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circle 1250 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Reference Reference information, including a wide range of topics such as crediting, assessing performance, case studies, glossaries, definitions, links, and more]
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circle 1550 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Links Though links are embedded throughout the stormwater wiki, this categorization may help you find information quicker]
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Biochars derived from nutrient rich sources such as manure and sludge may directly provide nutrients. Most biochars, however, have limited direct contribution to the nutrient pool with the exception of potassium and ammonium. Biochar may accelerate nutrient cycling over long time scales by serving as a short-term source of highly available nutrients, which become
 
incorporated into living biomass and labile soil organic pools. Thus biochar, while typically providing modest inputs of nutrients, enhances the bioavailability of nutrients in soil.
 
  
Because biochar typically enhances soil physical properties, including increasing water holding capacity, improving gas exchange, increasing surface area and availability of microsites for microbes, and in some cases increasing cation exchange capacity, biochar enhances microbial activity in soil. In addition, carbon in biochar provides a sorptive surface that can retain nutrients and thus minimize leaching and volatilization of nutrients.
 
  
Several studies suggest biochar amendments in soil result in increased microbial biomass, while other studies show no effect. Mixed results have also been observed for the effects of biochar on microbial community composition.
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<imagemap>
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Image:Topics image map.png|800px|thumb|alt=imagemap for stormwater BMPs|'''Stormwater Topics found in this stormwater wiki'''. Mouse hover over an '''i''' box to read a description of the practice, or click on an '''i''' box to go to a page on the practice.
 +
circle 130 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Best_Management_practices Best management practices treat or reduce stormwater volume through infiltration, filtration, sedimentation, chemical interaction, and prevention. Examples include bioretention (raingardens), swales, ponds, street sweeping, and pretreatment filtering and settling.]
 +
circle 400 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Best_management_practices/Specifications_and_details Specifications and details include guidance and images, including details, on how to design, construct, maintain, and assess stormwater best management practices]
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circle 700 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Regulatory/Construction_(CSW) Information on the construction stormwater permit, technical information on construction stormwater best management practices, and links to photos, images, and tables]
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circle 1000 195 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Regulatory/Municipal_(MS4) Information on the municipal (MS4) stormwater permit, technical information on post-construction stormwater best management practices, and links to photos, images, and tables]
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circle 1250 190 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_3_-_Regulatory/Municipal_(MS4)/TMDLs Links to information on total maximum daily loads, including regulatory guidance and information, examples, and tools]
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circle 1550 170 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Pollutants Information on pollutants includes pollutant-specific information on phosphorus, solids, bacteria and pathogens, and chloride; information on pollutant removal; and information on pollutants in stormwater runoff]
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circle 130 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Technical_and_specific_topic_information/soils_and_media Information on soils and engineered media used in stormwater applications, including soil processes and properties, measuring and assessing soils, media mixes, media applications and performance, and amendements such as iron and biochar]
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circle 400 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Technical_and_specific_topic_information/infiltration Information on infiltration of stormwater runoff, including best management practices, constraints on infiltration, evaluating the potential for infiltration, effects on groundwater, and case studies]
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circle 700 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Technical_and_specific_topic_information/vegetation Information on applications of vegetation in stormwater management, including planning for vegetation at a site, establishment and maintenance, and plant lists and selection]
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circle 1000 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Management/Green_infrastructure Information on green infrastructure and green stormwater infrastructure, including definitions, example and best management practices, operatyion and maintenance, planning, multiple benefits, and case studies]
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circle 1250 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Management/MIDS Minimal Impact Design Standards, including definitions, documents, processes, performance goals, and calculator information, including examples, applications, and supporting information for the calculator]
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circle 1550 450 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_Management/Winter_management Winter management as it applies to stormwater management, including deicing, chloride, best management practice design and performance, and snow management]
 +
circle 130 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Models,_modeling,_and_monitoring Models, monitoring, and monitoring guidance, including information on specific models, links, and case studies/applications]
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circle 400 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_1_-_Case_studies_and_examples Case studies and examples for a wide range of stormwater topics]
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circle 700 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Images The stormwater wiki has about 2000 images, including photos, schematics, graphs, and more]
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circle 1000 700 30 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Tables There are more than 600 tables with information on a wide variety of stormwater topics]
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circle 1250 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Reference Reference information, including a wide range of topics such as crediting, assessing performance, case studies, glossaries, definitions, links, and more]
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circle 1550 700 50 [https://stormwater.pca.state.mn.us/index.php?title=Category:Level_2_-_General_information,_reference,_tables,_images,_and_archives/Links Though links are embedded throughout the stormwater wiki, this categorization may help you find information quicker]
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</imagemap>
  
Specific conclusions from the DeLuca et al. (2015) paper include the following.
 
*Biochar increases nitrogen mineralization is soils with low mineralization potential (e.g. forest soils). Wood-based biochars appear to have the greatest effect on mineralization.
 
*Aged biochar shows greater accumulation of inorganic nitrogen, suggesting reduced nitrogen availability and cycling over time. Additions of fresh biochar are recommended if continued enhanced nutrient cycling is desired.
 
*Low-temperature biochars have greater nitrogen immobilization due to more bioavailable carbon, but immobilization to these biochars is likely to be short-term.
 
*Biochar effects on nitrogen fixation are mixed, but studies of compost-biochar mixes show a decrease in nitrogen fixation while wood-based biochars show increased fixation.
 
*Phosphorus in wood-based biochars is largely immediately soluble and readily released to soil, where it becomes available to plants. However, the overall phosphorus concentration in wood-based biochars is much lower than in manure- or sludge-based biochars.
 
*Application of biochar at varying rates result in an increase in available soil phosphorus, but there is little evidence this translates into increased plant uptake. This may be due to presence of abundant sites for adsorption in fresh biochars. Phosphorus decreases over time as biochar ages.
 
*Laboratory studies have shown that biochar addition induces an increase in phosphatase activity which would increase the release of P from soil organic matter and organic residues.
 
*Biochar effects on phosphorus are likely to be greatest in acidic soils, where addition of biochar raises pH and increases the potential adsorption to alkaline metals (calcium, potassium, magnesium).
 
*Biochar effects on sulfur are uncertain, but are likely to be similar to those for phosphorus. Any enhanced adsorption or mobilization, particularly in aged biochar, will most likely be attributable to enhanced water holding capacity and surface area.
 
  
'''Recommended reading'''
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[[Category:Level 2 - General information, reference, tables, images, and archives/Reference]]
*Anderson, C. R., Condron, L. M., Clough, T. J., Fiers, M., Stewart, A., Hill, R. A. and Sherlock, R. R. (2011) ‘Biochar induced soil microbial community change: Implications for biogeochemical cycling of carbon, nitrogen and phosphorus’,  Pedobiologia, vol 54, pp309–320.
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*Borchard, N., Wolf, A., Laabs, V., Aeckersberg, R., Scherer, H. W., Moeller, A. and Amelung, W. (2012a) ‘Physical activation of biochar and its meaning for soil fertility and nutrient leaching – a greenhouse experiment’, Soil Use and Management, vol 28, pp177–184
 
*Chan, K. Y. and Xu, Z. (2009) ‘Biochar: nutrient properties and their enhancement’, in J. Lehmann and S. Joseph (eds) Biochar for Environmental Management, Earthscan, London, pp 67–84
 
*Clough, T. J. and Condron, L. M. (2010) ‘Biochar and the nitrogen cycle: introduction’, Journal of Environmental Quality, vol 39, pp1218–1223
 
*Crutchfield, E. F., Merhaut, D. J., Mcgiffen, M. E. and Allen, E. B. (2010) ‘Effects of biochar on nutrient leaching and plant growth’, Hortscience, vol 45, S163–S163.
 
*Jeffery, S., Verheijen, F. G. A., Van Der Velde, M. and Bastos, A. C. (2011) ‘A quantitative review of the effects of biochar application to soils on crop productivity using meta-analysis’, Agriculture Ecosystems and Environment, vol 144, pp175–187
 
*Jones, D. L., Rousk, J., Edwards-Jones, G., DeLuca, T. H. and Murphy, D. V. (2012) ‘Biochar-mediated changes in soil quality and plant growth in a three year field trial’, Soil Biology and Biochemistry, vol 45, pp113–124
 
*Joseph, S. D., Downie, A., Munroe, P., Crosky, A. and Lehmann, J. (2007) ‘Biochar for carbon sequesteration, reduction of greenhouse gas emissions and enhancement of soil fertility; a review of the materials science’ Proceedings from  Australian Combustion Symposium, University of Sydney, Australia, pp1–4
 
*Laird, D., Fleming, P., Wang, B., Horton, R. and Karlen, D. (2010) ‘Biochar impact on nutrient leaching from a Midwestern agricultural soil’, Geoderma, vol 158, pp436–442
 
*Lehmann, J., Rillig, M. C., Thies, J., Masiello, C. A., Hockaday, W. C. and Crowley, D. (2011) ‘Biochar effects of soil biota – A review’, Soil Biology and Biochemistry, vol 43, pp1812–1836
 
*Nelson, N. O., Agudelo, S. C., Yuan, W. and Gan, J. (2011) ‘Nitrogen and phosphorus availability in biochar-amended soils’, Soil Science, vol 176, pp218–226
 
*Pietikäinen, J., Kiikkila, O. and Fritze, H. (2000) ‘Charcoal as a habitat for microbes and its effect on the microbial community of the underlying humus’, Oikos, vol 89, pp231–242
 
*Quilliam, R. S., Marsden, K. A., Gertler, C., Rousk, J., DeLuca, T. H. and Jones, D. L. (2012) ‘Nutrient dynamics, microbial growth and weed emergence in biochar amended soil are influenced by time since application and reapplication rate’,  Agriculture, Ecosystems, and Environment, vol 158, pp192–199
 
*Schultz, H. and Glaser, B. (2012) ‘Effects of biochar compared to organic and inorganic fertilizers on soil quality and plant growth in a greenhouse experiment’, Journal of Soil Science and Plant Nutrition, vol 175, pp410–422
 
*Yoo, G. and Kang, H. (2010) ‘Effects of biochar addition on greenhouse gas emissions and microbial responses in a short-term laboratory experiment’, Journal of Environmental Quality, vol 41, pp1193–1202
 
  
==Standards, classification, testing, and distributors==
 
Because of the large number of potential feedstocks, production conditions (primarily temperature), and applications for biochar, biochar classification is an active area of research. The information in this section largely comes from the [https://biochar-international.org/ International Biochar Initiative], but some additinal references include the following.
 
  
*Arbestain et al. (2015): A biochar classification system and associated test methods
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*Klassen (2017): Biochar characterization and a method for estimating biochar quality from proximate analysis results
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*Leng et al. (2019): Biochar stability assessment methods: A review
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Image:Stormwater BMPs.png|500px|thumb|alt=imagemap for stormwater BMPs|<font size=3>Stormwater Best Management Practices. Mouse hover over an '''i''' box to read a description of the practice, or click on an '''i''' box to go to a page on the practice.</font size>
*[https://biochar-us.org/go-deeper United States Biochar Initiative]
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circle 30 125 30 [[Infiltration|Infiltration basins, infiltration trenches, dry wells, and underground infiltration systems capture and temporarily store stormwater before allowing it to infiltrate into the soil. As the stormwater penetrates the underlying soil, chemical, biological and physical processes remove pollutants and delay peak stormwater flows.]]
*Budai et al. (2013): Biochar Carbon Stability Test Method: An Assessment of methods to determine biochar carbon stability
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circle 270 125 30 [[Bioretention|Bioretention (rain garden) is a terrestrial-based (up-land as opposed to wetland) water quality and water quantity control process. Bioretention employs a simplistic, site-integrated design that provides opportunity for runoff infiltration, filtration, storage, and water uptake by vegetation.]]
 
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circle 600 125 30 [[Trees|Tree trenches and tree boxes (collectively called tree BMP(s)), the most commonly implemented tree BMPs, can be incorporated anywhere in the stormwater treatment train but are most often located in upland areas of the treatment train. The strategic distribution of tree BMPs help control runoff close to the source where it is generated. Tree BMPs can mimic certain physical, chemical, and biological processes that occur in the natural environment.]]
===Biochar standards===
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circle 690 150 30 [[Permeable pavement|Permeable pavements allow stormwater runoff to filter through surface voids into an underlying stone reservoir for temporary storage and/or infiltration. The most commonly used permeable pavement surfaces are pervious concrete, porous asphalt, and permeable interlocking concrete pavers (PICP). Permeable pavements have been used for areas with light traffic at commercial and residential sites to replace traditional impervious surfaces in low-speed roads, alleys, parking lots, driveways, sidewalks, plazas, and patios.]]
The Internation Biochar Initiative (IBI) developed Standardized Product Definition and Product Testing Guidelines for Biochar That Is Used in Soil, also referred to The Biochar Standards. These standards provide guidelines and is not a formal set of industry specifications. The goal of The Biochar Standards is to "universally and consistently define what biochar is, and to confirm that a product intended for sale or use as biochar possesses the necessary characteristics for safe use. The IBI Biochar Standards also provide common reporting requirements for biochar that will aid researchers in their ongoing efforts to link specific functions of biochar to its beneficial soil and crop impacts." The IBI also provides a certification program. Information on the standards and certification are found on [https://biochar-international.org/characterizationstandard/ International Biochar Institute's website] or at the [https://www.biochar-international.org/wp-content/uploads/2018/04/IBI_Biochar_Standards_V2.1_Final.pdf IBI's Standardized Product Definition and Product Testing Guidelines for Biochar That Is Used in Soil].
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circle 920 125 30 [[Stormwater and rainwater harvest and use/reuse|A stormwater harvesting and use system is a constructed system that captures and retains stormwater for beneficial use at a different time or place than when or where the stormwater was generated. A stormwater harvesting and use system potentially has four components: collection system (which could include the catchment area and stormwater infrastructure such as curb, gutters, and stormsewers), storage unit (such as a cistern or pond) treatment system: pre and post (that removes solids, pollutants and microorganisms, including any necessary control systems), if needed, and the distribution system (such as pumps, pipes, and control systems).]]
 
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circle 1130 125 30 [[Green roofs|Green roofs consist of a series of layers that create an environment suitable for plant growth without damaging the underlying roof system. Green roofs create green space for public benefit, energy efficiency, and stormwater retention/ detention. Green roofs occur at the beginning of stormwater treatment trains. Green roofs provide filtering of suspended solids and pollutants associated with those solids, although total suspended solid (TSS) concentrations from traditional roofs are generally low. Green roofs provide both volume and rate control, thus decreasing the stormwater volume being delivered to downstream Best Management Practices (BMPs).]]
The IBI also provides [https://biochar-international.org/biochar-classification-tool/ a biochar classification tool]. Currently, four biochar properties are classified:
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circle 30 325 30 [[Dry swale (Grass swale)|Dry swales, sometimes called grass swales, are similar to bioretention cells but are configured as shallow, linear channels. They typically have vegetative cover such as turf or native perennial grasses. Dry swales may be constructed as filtration or infiltration practices, depending on soils. If soils are highly permeable (A or B soils), runoff infiltrates into underlying soils. In less permeable soils, runoff is treated by engineered soil media and flows into an underdrain, which conveys treated runoff back to the conveyance system further downstream. Check dams incorporated into the swale design allow water to pool up and infiltrate into the underlying soil or engineered media, thus increasing the volume of water treated.]]
*Carbon storage value
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circle 270 325 30 [[Wet swale (wetland channel)|Wet swales occur when the water table is located very close to the surface or water does not readily drain out of the swale. A wet swale acts as a very long and linear shallow biofiltration or linear wetland treatment system. Wet swales do not provide volume reduction and have limited treatment capability. Incorporation of check dams into the design allows treatment of a portion or all of the water quality volume within a series of cells created by the check dams. Wet swales planted with emergent wetland plant species provide improved pollutant removal. Wet swales may be used as pretreatment practices. Wet swales are commonly used for drainage areas less than 5 acres in size.]]
*Fertilizer value (P, K, S, and Mg only)
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circle 600 325 30 [[High-gradient stormwater step-pool swale|Stormwater step pools address higher energy flows due to more dramatic slopes than dry or wet swales. Using a series of pools, riffle grade control, native vegetation and a sand seepage filter bed, flow velocities are reduced, treated, and, where applicable, infiltrated. The physical characteristics of the stormwater step pools are similar to Rosgen A or B stream classification types, where “bedform occurs as a step/pool, cascading channel which often stores large amounts of sediment in the pools associated with debris dams”. Stormwater step pools are designed with a wide variety of native plant species depending on the hydraulic conditions and expected post-flow soil moisture at any given point within the stormwater step pool.]]
*Liming value
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circle 820 325 30 [[Vegetated filter strips|Vegetated filter strips are designed to remove solids from stormwater runoff. The vegetation can consist of natural and established vegetation communities and can range from turf grass to woody species with native grasses and shrubs. Because of the range of suitable vegetation communities, vegetated filter strips can be easily incorporated into landscaping plans; in doing so, they can accent adjacent natural areas or provide visual buffers within developed areas. They are best suited for treating runoff from roads, parking lots and roof downspouts. Their primary function is to slow runoff velocities and allow sediment in the runoff to settle or be filtered by the vegetation. By slowing runoff velocities, they help to attenuate flow and create a longer time of concentration. Filter strips do not significantly reduce runoff volume, but there are minor losses due to infiltration and depression storage. Filter strips are most effective if they receive sheet flow and the flow remains uniformly distributed across the filter strip.]]
*Particle size distribution
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circle 1040 325 30 [[Iron enhanced sand filter (Minnesota Filter)|Iron-enhanced sand filters are filtration Best Management Practices (BMPs) that incorporate filtration media mixed with iron. The iron removes several dissolved constituents, including phosphate, from stormwater. Iron-enhanced sand filters may be particularly useful for achieving low phosphorus levels needed to improve nutrient impaired waters. Iron-enhanced sand filters could potentially include a wide range of filtration BMPs with the addition of iron; however, iron is not appropriate for all filtration practices due to the potential for iron loss or plugging in low oxygen or persistently inundated filtration practices.]]
 
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circle 1130 325 30 [[Filtration|Sand (media) filters have widespread applicability and are suitable for all land uses, as long as the contributing drainage areas are limited (e.g., typically less than 5 acres). Sand filters are not as aesthetically appealing as bioretention, which makes them more appropriate for commercial or light industrial land uses or in locations that will not receive significant public exposure. Sand filters are particularly well suited for sites with high percentages of impervious cover (e.g., greater than 50 percent). Sand filters can be installed underground to prevent the consumption of valuable land space (often an important retrofit or redevelopment consideration).]]
===Distributors===
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circle 170 525 30 [[Stormwater ponds|Stormwater ponds are typically installed as an end-of-pipe BMP at the downstream end of the treatment train. Stormwater pond size and outflow regulation requirements can be significantly reduced with the use of additional upstream BMPs. However, due to their size and versatility, stormwater ponds are often the only management practice employed at a site and therefore must be designed to provide adequate water quality and water quantity treatment for all regulated storms.]]
{{alert|The Minnesota Pollution Control Agency does not endorse specific distributors of biochar or biochar products|alert-warning}}
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circle 265 525 30 [[Stormwater wetlands|Stormwater wetlands are similar in design to stormwater ponds and mainly differ by their variety of water depths and associated vegetative complex. They require slightly more surface area than stormwater ponds for the same contributing drainage area. Stormwater wetlands are constructed stormwater management practices, not natural wetlands. Like ponds, they can contain a permanent pool and temporary storage for water quality control and runoff quantity control. Wetlands are widely applicable stormwater treatment practices that provide both water quality treatment and water quantity control. Stormwater wetlands are best suited for drainage areas of at least 10 acres. When designed and maintained properly, stormwater wetlands can be an important aesthetic feature of a site.]]
 
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circle 600 525 30 [[Pretreatment|Pretreatment practices are installed immediately preceding one or more structural stormwater BMPs. Pretreatment reduces maintenance and prolongs the lifespan of structural stormwater BMPs by removing trash, debris, organic materials, coarse sediments, and associated pollutants prior to entering structural stormwater BMPs. Implementing pretreatment devices also improves aesthetics by capturing debris in focused or hidden areas.]]
A list of biochar distributors is provided on the [https://biochar-us.org/manufacturers-retailers United States Biochar Initiative website (USBI)]. Note the USBI neither provides endorsements nor accepts liability for any particular product or technology listed.
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circle 820 510 30 [[Sediment control practices|Sediment control practices are designed to prevent or minimize loss of eroded soil at a site. Typical sediment control practices focus on 1) physical filtration of sediment by trapping soil particles as water passes through a silt fence, drop inlet screen, fiber roll, etc., 2)settling processes, that allow sediment to fall out of flows that are slowed and temporarily impounded in ponds, traps, or in small pools created by berms, silt fencing, inlet protection dikes, check dams, etc.]]
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circle 1040 500 30 [[Erosion prevention practices|Erosion prevention practices include 1) planning approaches that minimize the size of the bare soil area and the length of time disturbed areas are exposed to the elements – especially for long, steep slopes and easily erodible soils, 2) diverting or otherwise controlling the location and volume of run-on flows to the site from adjacent areas, 3)keeping concentrated flows in ditches stabilized with vegetation, rock, or other material, and 4)covering bare soil with vegetation, mulch, erosion control blankets, turf reinforcement mats, gravel, rock, plastic sheeting, soil binder chemicals, etc.]]
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circle 1235 525 30 [[Pollution prevention|Pollution prevention (P2) is a “front-end” method to decrease costs, risks, and environmental concerns. In contrast to managing pollution after it is created, P2 reduces or eliminates waste and pollution at its source. P2 includes a variety of residential, municipal, and industrial practices.]]
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</imagemap>
  
===Test methods===
 
There is no universally accepted standard for biochar testing. The Internation Biochar Initiative (IBI) developed [https://biochar-international.org/wp-content/uploads/2019/11/IBI_Biochar_Standards_V2.1_Final1.pdf Standardized Product Definition and Product Testing Guidelines for Biochar That Is Used in Soil]. The goals of this document are to provide "stakeholders and 5 commercial entities with standards to identify certain qualities and characteristics of biochar materials according to relevant, reliable, and measurable characteristics." The document provides information and test parameters and test nethods for three categories.
 
*Test Category A – Basic Utility Properties (required)
 
*Test Category B – Toxicant Assessment (required)
 
*Test Category C – Advanced Analysis and Soil Enhancement Properties
 
  
The IBI document also provides information on sampling procedures, laboratory standards, timing and frequency of testing, feedstcok and production parameters, frequency of testing, reporting, and additional information for specific types of biochar. The document also [https://biochar-international.org/wp-content/uploads/2019/11/IBI_Biochar_Standards_V2.1_Final1.pdf provides a discussion of H:C ratios], which are used to indicate the stability of a particular biochar.
+
<imagemap>
 
+
Image:Updated MPCA_Small_Site_Graphic.JPG|Image map test
==Effects of aging==
+
circle 55 152 15 [[Protection of existing trees on construction sites]]
Biochar undergoes transformations in soil after application, primarily through oxidation processes, typically mediated by microbes. Several researchers have studied effects of aging on biochar properties. Although researchers observe similar changes in the chemical and physical structure of biochar with aging, observed effects vary. It is therefore difficult to draw general conclusions about likely changes in the effects of biochar aging on fate of pollutants and soil hydraulic properties.
+
circle 55 291 15 [[Construction stormwater best management practice - stockpile management|Stockpile management]]
 
+
circle 55 378 15 [[Construction stormwater best management practice - construction materials management requirements|Construction materials management]]
Below is a summary of some research findings.
+
circle 55 447 15 [[Construction stormwater best management practice - construction materials management requirements|Construction materials management]]
*Mia et al. (2019) observed an increase in carboxylic and phenolic groups, a reduction of oxonium groups and the transformation of pyridine to pyridone with oxidation. This led to increased adsorption of ammonium and reduced adsorption of phosphate. Addition of biochar derived organic matter improved phosphate retention.
+
circle 55 564 15 [[Sediment control practices - Perimeter controls for disturbed areas]]
*Paetsch et al. (2018) studied effects of fresh and aged biochar on water availability and microbial parameters of a grassland soil. They observed improved water retention and microbial function with aged biochar. This was attributed to increased soil mineralization in soils with aged biochar.
+
circle 55 714 15 [[Sediment control practices - Storm drain inlet protection]]
*Paetsch et al. (2018) observed increased C:N ratios as biochar aged.
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circle 55 813 15 [[Construction stormwater best management practice – Concrete, paint, stucco and other washout guidance]]
*Dong et al. (2017) observed increased specific surface area, increased carbon content, smaller average pore size, but no change in chemical structure of aged biochar versus fresh biochar.
+
circle 383 817 15 [[Sediment control practices - Vehicle tracking BMPs]]
*Quan et al. (2020) and Spokas (2013) observed biologically-mediated changes in aged biochar. Mineralization resulted in decreased carbon content in aged biochar.
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circle 388 527 18 [[Protection of existing trees on construction sites]]
*Hale et al. (2012) determined that aged biochar retained its ability to adsorb PAHs.
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circle 395 634 18 [[Sediment control practices - Storm drain inlet protection]]
*Cao et al. found that aged biochar had decreased carbon and nitrogen contents; reduced pH values, reduced porosity and specific surface area, and increased oxygen-containing functional groups on the surface. In general, the surface characteristics of the aged biochar varied with soil type.
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circle 545 579 18 [[Construction stormwater best management practice – Concrete, paint, stucco and other washout guidance]]
 
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circle 624 433 18 [[Construction stormwater best management practice - construction materials management requirements|Construction materials management]]
==Storage, handling, and field application==
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circle 667 753 18 [[Sediment control practices - Vehicle tracking BMPs]]
The following guidelines for field application of biochar are presented by Major (2010).
+
circle 784 677 18 [[Construction stormwater best management practice – Stormwater Pollution Prevention Plan]]
*Biochar dust particles can form explosive mixtures with air in confined spaces, and there is a danger of spontaneous heating and ignition when biochar is tightly packed. This occurs because fresh biochar quickly sorbs oxygen and moisture, and these sorption processes are exothermic, thus potentially leading to high temperature and ignition of the material.
+
circle 838 805 15 [[Sediment control practices - Perimeter controls for disturbed areas]]
*Volatile compounds present in certain biochar materials may also represent a fire hazard, but the amount of such compounds found in biochar can be managed by managing the pyrolysis temperature and heating rate. Certain chemicals can be added to biochar to decrease its flammability (e.g. boric acid, ferrous sulfate). The best way to prevent fire is to store and transport biochar in an atmosphere which excludes oxygen. Formulated biochar products such as mixtures with composts, manures, or the production of biochar-mineral complexes will potentially yield products which are much less flammable.
+
circle 939 358 18 [[Construction stormwater best management practice - construction materials management requirements|Construction materials management]]
*For fine-grained biochars, wind losses can be significant (up to 30% loss has been reported). Biochar can be moistened, although this will add to the weight of the material and increase transportation costs. If wind loss is a concern, apply biochar when winds are mild and/or during a light rain. Pelleted biochars or mixing with other materials may reduce wind loss.
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circle 1004 421 18 [[Construction stormwater best management practice - stockpile management|Stockpile Management]]
*To avoid water erosion, incorporate biochar into the soil.
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circle 1035 660 15 [[Protection of existing trees on construction sites]]
*Application rates vary depending on the biochar and the intended use of the biochar.
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*Biochar is relatively stable and recalcitrant. In some cases, biochar may improve soil conditions with time. Consequently, biochar application frequency is likely to be on the order of years.
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circle 1182 557 15 [[Construction stormwater best management practice – Site stabilization]]
*Biochar can be readily mixed with other materials, such as compost.
+
circle 1132 711 15 [[Construction stormwater best management practice – Site stabilization]]
*The depth of biochar application varies with the intended purpose.
+
circle 1297 450 18 [[Protection of existing trees on construction sites]]
**For fertility applications, locate biochar near the soil surface in the active rooting zone.
+
rect 449 170 507 185 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_5_Stormwater_Pollution_Prevention_Plan_(SWPPP)_Content#5.24 The SWPPP must describe methods to minimize soil compaction and preserve topsoil. Minimizing soil compaction is not required where the function of a specific area dictates compaction.]
**For moisture management, locate biochar throughout the root zone.
+
rect 409 327 459 342 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_8_Erosion_Prevention_Practices#8.4 Permittees must stabilize all exposed soil areas, including stockpiles. Stabilization must be initiated immediately to limit soil erosion when construction activity has ceased on any portion of the site and will not resume for a period exceeding 14 calendar days. Stabilization must be completed no later than 14 calendar days after the construction activity has ceased. Stabilization is not required on certain temporary stockpiles but must provide sediment controls at the base of the stockpile.]
**For carbon sequestration, locate biochar deeper in the soil profile to reduce the likelihood of microbial mineralization.
+
rect 310 397 368 412 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_12_Pollution_Prevention_Management_Measures#12.2 Permittees must place building products and landscape materials under cover (e.g., plastic sheeting or temporary roofs) or protect them by similarly effective means designed to minimize contact with stormwater. Permittees are not required to cover or protect products which are either not a source of contamination to stormwater or are designed to be exposed to stormwater.]
*For stormwater applications, biochar can be broadcast and then incorporated into the soil. If fertility is the primary objective, banding may be utilized.
+
rect 107 514 165 529 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_12_Pollution_Prevention_Management_Measures#12.5 Permittees must properly store, collect and dispose solid waste in compliance with Minn. R. ch. 7035.]
*For turf applications, biochar can be mixed with soil (sand and topsoil) and other amendments such as compost.
+
rect 258 665 308 680 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_9_Sediment_Control_Practices#9.2 Permittees must establish sediment control BMPs on all downgradient perimeters of the site and downgradient areas of the site that drain to any surface water, including curb and gutter systems. Permittees must locate sediment control practices upgradient of any buffer zones. Permittees must install sediment control practices before any upgradient land-disturbing activities begin and must keep the sediment control practices in place until they establish permanent cover.]
*Application rates depend on the intended use of a biochar. Field testing is recommended prior to application. Typical rates reported in the literature are 5-50 tonnes of biochar per hectare.
+
rect 243 765 293 780 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_9_Sediment_Control_Practices#9.7 Permittees must protect all storm drain inlets using appropriate BMPs during construction until they establish permanent cover on all areas with potential for discharging to the inlet.]
 
+
rect 39 882 98 896 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_12_Pollution_Prevention_Management_Measures#12.9 Permittees must provide effective containment for all liquid and solid wastes generated by washout operations related to the construction activity. Permittees must prevent liquid and solid washout wastes from contacting the ground and must design the containment so it does not result in runoff from the washout operations or areas. ermittees must properly dispose liquid and solid wastes in compliance with MPCA rules. Permittees must install a sign indicating the location of the washout facility.]
==Sustainability==
+
rect 447 900 506 914 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_9_Sediment_Control_Practices#9.11 Permittees must install a vehicle tracking BMP to minimize the track out of sediment from the construction site or onto paved roads within the site.]
Because biochar is produced from biomass, including wastes, it is sustainable from an availability or supply standpoint. Sustainable biochar production, however, is less certain based on current economic constraints. Biochar has several potential markets and exploiting these markets is necessary for biochar production to be sustainable. Examples of specific markets include stormwater media, soil health and fertility, and carbon sequestration [Biogreen http://www.biogreen-energy.com/biochar-production/] (accessed December 10, 2019). Sustainable biochar production must also meet certain environmental and economic criteria, includign the following.
+
rect 1254 237 1309 252 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_20_SWPPP_Availability Permittees must keep the SWPPP, including all changes to it, and inspections and maintenance records at the site during normal working hours by permittees who have operational control of that portion of the site.]
*Biochar systems should be, at a minimum, carbon and energy neutral.
+
rect 1218 797 1268 812 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_8_Erosion_Prevention_Practices#8.4 Permittees must stabilize all exposed soil areas, including stockpiles. Stabilization must be initiated immediately to limit soil erosion when construction activity has permanently or temporarily ceased on any portion of the site and will not resume for a period exceeding 14 calendar days. Stabilization must be completed no later than 14 calendar days after the construction activity has ceased. Stabilization is not required on constructed base components of roads, parking lots and similar surfaces.]
*Biochar systems should prioritize the use of biomass residuals for biochar production.
+
rect 1209 863 1268 878 [https://stormwater.pca.state.mn.us/index.php?title=MN_CSW_Permit_Section_23_Discharges_to_Special_(Prohibited,_Restricted,_Other)_and_Impaired_Waters#23.9 Permittees must immediately initiate stabilization of exposed soil areas, as described in item 8.4, and complete the stabilization within seven (7) calendar days after the construction activity in that portion of the site temporarily or permanently ceases.]
*Biochar systems should be safe, clean, economical, efficient, and meet or exceed environmental standards and regulatory requirements of the regions where they are deployed.
+
</imagemap>
*Biochar systems should promote or enhance ecological conditions for biodiversity at the local and landscape level.
 
*Biochar systems should not pollute or degrade water resources.
 
*Biochar systems should not jeopardize food security by displacing or degrading land grown for food; and should seek to complement existing local agro-ecological practices.
 
 
 
For more information, see the [https://biochar-international.org/sustainability-climate-change/ International Biochar Initiative discussion] on sustainable biochar production. For a discussion of biochar sustainability, see [https://www.researchgate.net/publication/275770511_Biochar_Sustainability_and_Certification  sustainability and Certification] (Vereijen et al., 2015).
 
 
 
==References==
 
 
 
*[https://biochar.international/guides/properties-fresh-aged-biochar/ THE PROPERTIES OF FRESH & AGED BIOCHAR]
 
*[https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=3291&context=etd  characterization and engineering]
 
 
 
*Agyarko-Mintah E, Cowie A, Singh BP, Joseph S, Van Zwieten L, Cowie A, Harden S, Smillie R.. 2017. Biochar increases nitrogen retention and lowers greenhouse gas emissions when added to composting poultry litter. Waste Manag. 61:138-149. doi: 10.1016/j.wasman.2016.11.027. Epub 2016 Dec 8.
 
*Budai; A. R. Zimmerman; A.L. Cowie; J.B.W. Webber; B.P. Singh; B. Glaser; C. A. Masiello; D. Andersson; F. Shields; J. Lehmann; M. Camps Arbestain; M. Williams; S. Sohi; S. Joseph. 2013. Biochar Carbon Stability Test Method: An Assessment of methods to determine biochar carbon stability. Accessed December 12, 2019.
 
*Cao, T., Wenfu Chen, Tiexin Yang, Tianyi He, Zunqi Liu, Jun Meng. 2017. Surface Characterization of Aged Biochar Incubated in Different Types of Soil. BioResources. 12:3: 6366-6377
 
*Conz, R., T. Abbruzzini, C.A. de Andrade, D.M.B.P. Milori. 2017. Effect of Pyrolysis Temperature and Feedstock Type on Agricultural Properties and Stability of Biochars. Agricultural Sciences 8:9:914-933.
 
*DeLuca, T.H., M.D. MacKenzie, D.L. Jones. 2015. Biochar effects on soil nutrient transformations.
 
*Ding, Y., Yu-Xue Liu, Wei-Xiang Wu, De-Zhi Shi, Min Yang, and Zhe-Ke Zhong. 2010. Evaluation of Biochar Effects on Nitrogen Retention and Leaching in Multi-Layered Soil Columns. Water, Air, & Soil Pollution. Volume 213, Issue 1–4, pp 47–55.
 
*Domingues, R.R., Paulo F. Trugilho, Carlos A. Silva, Isabel Cristina N. A. de Melo, Leoà nidas C. A. Melo, Zuy M. Magriotis, Miguel A. SaÂnchez-Monedero. 2017. Properties of biochar derived from wood and high-nutrient biomasses with the aim of agronomic and environmental benefits. PLOS ONE
 
*Flesch, F., Pia Berger, Daniel Robles-Vargas , Gustavo Emilio Santos-Medrano, and Roberto Rico-Martínez. 2019. Characterization and Determination of the Toxicological Risk of Biochar Using Invertebrate Toxicity Tests in the State of Aguascalientes,México. Appl. Sci. 2019, 9, 1706; doi:10.3390/app9081706.
 
*Gai X, Wang H, Liu J, Zhai L, Liu S, et al. (2014) Effects of Feedstock and Pyrolysis Temperature on Biochar Adsorption of Ammonium and Nitrate. PLoS ONE 9(12). 19 pages. doi:10. 1371/journal.pone.0113888.
 
*Hale, S.E. Kelly Hanley, Johannes Lehmann, Andrew R. Zimmerman, and Gerard Cornelissen. 2012. Effects of Chemical, Biological, and Physical Aging As Well As Soil Addition on the Sorption of Pyrene to Activated Carbon and Biochar. Environ Sci Tech.
 
*Han, Y., Byoungkoo Choi, and Xiangwei Chen. 2018. Adsorption and Desorption of Phosphorus in Biochar-Amended Black Soil as Affected by Freeze-Thaw Cycles in Northeast China.
 
*Hardy, B., Steven Sleutel, Joseph E. Dufey, and Jean-Thomas Cornelis. 2019. The Long-Term Effect of Biochar on Soil Microbial Abundance, Activity and Community Structure Is Overwritten by Land Management. Frontiers Environ. Sci. 110:7:1-14. DOI: 10.3389/fenvs.2019.00110.
 
*Hoffman-Krull, K.H. 2019. [https://rodaleinstitute.org/blog/whats-biochar-how-to-stabilize-carbon-in-your-soil/ WHAT’S BIOCHAR? HOW TO STABILIZE CARBON IN YOUR SOIL]. Rodale Institute.
 
*Internation Biochar Initiative. Biochar Feedstocks. Accessed December 12, 2019.
 
*Iqbal, H., Manuel Garcia-Perez, Markus Flury. 2015. Effect of biochar on leaching of organic carbon, nitrogen, and phosphorus from compost in bioretention systems Science of the Total Environment 521–522 (2015) 37–45
 
*Jahromi, N.B., and A. Fulcher. What is Biochar and How Different Biochars Can Improve Your Crops. University of Tennessee Extension. Publication W829. Accessed 12/12/2019.
 
*Jien, Shih-Hao, and Chien-Sheng Wang. 2013. Effects of biochar on soil properties and erosion potential in a highly weathered soil. Catena. 110:225-233
 
*Jindo, K., H. Mizumoto3, Y. Sawada, M. A. Sanchez-Monedero1, and T. Sonoki. 2014. Physical and chemical characterization of biochars derived from different agricultural residues. Biogeosciences, 11, 6613–6621.
 
*Kasak, K., Jaak Truu, Ivika Ostonen, Jürgen Sarjas, Kristjan Oopkaup, Päärn Paiste, Margit Kõiv-Vainik, Ülo Mander, Marika Truu. 2018. Biochar enhances plant growth and nutrient removal in horizontal subsurface flow constructed wetlands Science of the Total Environment 639:67–74
 
*Klasson, T.K. 2017. Biochar characterization and a method for estimating biochar quality from proximate analysis results. Biomass and Bioenergy. 96:50-58.
 
*Laird, D., Pierce Flemming, Baiqun Wang, Robert Horton, Douglas Karlen. 2010. Biochar impact on nutrient leaching from a Midwestern agricultural soil. Agronomy Publications. Iowa State University. 9 p.
 
*Lyu H, He Y, Tang J, Hecker M, Liu Q, Jones PD, Codling G, Giesy JP. 2016. Effect of pyrolysis temperature on potential toxicity of biochar if applied to the environment. Environ Pollut. 218:1-7. doi: 10.1016/j.envpol.2016.08.014.
 
*Major, J. 2010. [https://www.biochar-international.org/wp-content/uploads/2018/04/IBI_Biochar_Application.pdf Guidelines on Practical Aspects of Biochar Application to Field Soil in Various Soil Management Systems].
 
*Mensah, A.K., and Kwame Agyei Frimpong. 2018. Biochar and/or Compost Applications Improve Soil Properties, Growth, and Yield of Maize Grown in Acidic Rainforest and Coastal Savannah Soils in Ghana. International Journal of Agronomy. Volume 2018, 8 pages. https://doi.org/10.1155/2018/6837404
 
*Mohanty, S.K., Renan Valenca, Alexander W. Berger, Iris K.M. Yu, Xinni Xiong, Trenton M. Saunders, Daniel C.W. Tsang. 2018. Plenty of room for carbon on the ground: Potential applications of biochar for stormwater treatment Science of the Total Environment, 625: 1644-1658.
 
*Mumme J, Getz J, Prasad M, Lüder U, Kern J, Mašek O, Buss W. 2018. Toxicity screening of biochar-mineral composites using germination tests. Chemosphere. 207:91-100. doi:10.1016/j.chemosphere.2018.05.042.
 
*Nabiul Afrooz, A.R.M., Ana K. Pitol, Dianna Kitt, and  Alexandria B. Boehm. 2018. Role of microbial cell properties on bacterial pathogen and coliphage removal in biochar-modified stormwater biofilters. Environ Sci: Water Res and Tech. 12:
 
*Nguyen, N.T. 2015. Adsorption Of Phosphorus From Wastewater Onto Biochar: Batch And Fixed-bed Column Studies
 
*Oleszczuk, P., Izabela Jo´sko, Marcin Ku´smierz. 2013. Biochar properties regarding to contaminants content and ecotoxicological assessment. Journal of Hazardous Materials 260 (2013) 375– 382.
 
*Quan G, Fan Q, Zimmerman AR, Sun J, Cui L, Wang H, Gao B, Yan J. 2020. Effects of laboratory biotic aging on the characteristics of biochar and its water-soluble organic products. J Hazard Mater. 2020 Jan 15;382:121071. doi: 10.1016/j.jhazmat.2019.121071
 
*Rawat, J., J. Saxena, and P. Sanwal. 2018. Biochar: A Sustainable Approach for Improving Plant Growth and Soil Properties. In: Biochar - An Imperative Amendment for Soil and the Environment. DOI: 10.5772/intechopen.82151
 
*Reddy, K.R., Tao Xie, and Sara Dastgheibi. 2014. Evaluation of Biochar as a Potential Filter Media for the Removal of Mixed Contaminants from Urban Storm Water Runoff. Journal Environ Eng. 140:12. https://doi.org/10.1061/(ASCE)EE.1943-7870.0000872
 
*Shamim Mia, Feike A. Dijkstra, and Balwant Singh. 2017.  Aging Induced Changes in Biochar’s Functionality and Adsorption Behavior for Phosphate and Ammonium. Environ. Sci. Technol. 51:8359−8367. DOI: 10.1021/acs.est.7b00647
 
*Soinne, H., Jarkko Hovi, PriitTammeorg, EilaTurtola. 2014. Effect of biochar on phosphorus sorption and clay soil aggregate stability. Geoderma. Volumes 219–220, May 2014, Pages 162-167.
 
*Spears, S. 2018. [https://regenerationinternational.org/2018/05/16/what-is-biochar/ What is Biochar?] Regeneration International.
 
*Spokas, K.A. 2013. Impact of biochar field aging on laboratory greenhouse gas production potentials. GCB Bioenergy (2013) 5, 165–176, doi: 10.1111/gcbb.12005
 
*Ulrich, B.A., Megan Loehnert  and  Christopher P. Higgins. 2017. Improved contaminant removal in vegetated stormwater biofilters amended with biochar Environmental Science: Water Research & Technology. 4:
 
*Wang, K., Na Peng, Guining Lu, Zhi Dang, 2018. Effects of Pyrolysis Temperature and Holding Time on Physicochemical Properties of Swine-Manure-Derived Biochar. Waste and Biomass Valorization. 1-12 DOI: 10.1007/s12649-018-0435-2
 
*Yang, F., Yue Zhou, Weiming Liu, Wenzhu Tang, Jun Meng, Wenfu Chen, and Xianzhen Li. 2019. Article Strain-Specific Effects of Biochar and Its Water-Soluble Compounds on Bacterial Growth. Appl. Sci. 9(16), 3209; https://doi.org/10.3390/app9163209.
 
*Yao, Y., Bin Gao, Mandu Inyang, Andrew R. Zimmerman, Xinde Cao, Pratap Pullammanappallil, Liuyan Yang. 2011 Biochar derived from anaerobically digested sugar beet tailings:Characterization and phosphate removal potential. Bioresource Technology. 102:6273-6278
 
*Yaoa, Y., Bin Gaoa, Mandu Inyanga, Andrew R. Zimmermanb, Xinde Caoc, Pratap Pullammanappallila, Liuyan Yangd. 2011. Removal of phosphate from aqueous solution by biochar derived from anaerobically digested sugar beet tailings. Journal of Hazardous Materials 190:501–507
 
*Yuan-Ying Wang, Xiang-Rong Jing, Ling-Li Li, Wu-Jun Liu, Zhong-Hua Tong, Hong Jiang. 2017. Biotoxicity Evaluations of Three Typical Biochars Using a Simulated System of Fast Pyrolytic Biochar Extracts on Organisms of Three Kingdoms. ACS Sustainable Chem. Eng. 2017, 5, 1, 481-488. https://doi.org/10.1021/acssuschemeng.6b01859
 
*Zhang, M., Muhammad Riaz, Lin Zhang, Zeinab El-desouki, and Cuncang Jiang. Biochar Induces Changes to Basic Soil Properties and Bacterial Communities of Different Soils to Varying Degrees at 25 mm Rainfall: More Effective on Acidic Soils. 2019. Frontiers Microbio. 12:10:1321. doi: 10.3389/fmicb.2019.01321
 
*Zhao, J.J. Xin-Jie Shen, Xavier Domene, Josep-Maria Alcañiz, Xing Liao and Cristina Palet. 2019. Comparison of biochars derived from different types of feedstock and their potential for heavy metal removal in multiple-metal solutions. Scientific Reports 9. Article 9869.
 
*Zhao, Shi-Xiang, Na Ta and Xu-Dong Wang  2017. Effect of Temperature on the Structural and Physicochemical Properties of Biochar with Apple Tree Branches as Feedstock Material Energies, 10:1293; doi:10.3390/en10091293
 
*Zhaoa, L., Xinde Caoa, Ondˇrej Maˇsekb, Andrew Zimmerman. 2013. Heterogeneity of biochar properties as a function of feedstock sources and production temperatures. Journal of Hazardous Materials 256– 257:1– 9
 
*Zheng, H., Zhenyu Wang, Xia Deng, Stephen Herbert, Baoshan Xing. 2013. Impacts of adding biochar on nitrogen retention and bioavailability in agricultural soil. Geoderma, Volume 206:32-39
 
 
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'''Information'''
<tr>
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<div class="mw-collapsible-content">'''
<th><center>Quick Guide for pretreatment sizing of filter strips</center></th>
+
*[https://stormwater.pca.state.mn.us/index.php?title=Information_on_soil Information on soil]
</tr>
+
*[[Compost and stormwater management]]'''</div>
<tr>
 
<td>
 
'''ENSURE YOUR UNITS ARE CONSISTENT AND CORRECT'''
 
*Determine, ''v''<sub>''S''</sub>, the settling velocity for the particle size targeted (recommend 80 microns for particle size. Determine v<sub>s</sub> from table on this page)
 
*Determine ''FR'', the target percent removal (recommend 50-70%)
 
*Determine ''A'', the area of directly connected impervious draining to the pretreatment practice
 
*Determine ''I'', the peak rain intensity (0.5 in/hr for a 1-inch event, Type 2 distribution)
 
*Calculate the area of the filter strip from LW = - ((c * I * A) / (v<sub>S</sub>) * ln(1 - FR)) where c = 0.7 for small storms
 
*Determine the length (L) and the width (W) from the above computation
 
</td>
 
</tr>
 
</table>
 
 
</div>
 
</div>
  
 +
<font size=5>Reporting phosphorus and TSS reduction credits from street sweeping</font size>
  
 +
[[File:Selbig graph.png|400px|thumb|alt=graph of P removal with street sweeping|<font size=3>Research conducted by Bill Selbig (USGS) shows that streets, when cleaned of leaf litter prior to a storm, can significantly decrease phosphorus loads in stormwater runoff ([https://www.usgs.gov/centers/umid-water/science/using-leaf-collection-and-street-cleaning-reduce-nutrients-urban?qt-science_center_objects=0#qt-science_center_objects Link to study])</font size>]]
 +
At this time, the MPCA has not developed guidance for how to credit reductions in phosphorus or total suspended solid loading associated with enhanced street sweeping. We anticipate developing this guidance in 2022. In developing  this guidance, consider the following.
 +
*Baseline: Credits toward permit compliance, such as compliance with <span title="The amount of a pollutant from both point and nonpoint sources that a waterbody can receive and still meet water quality standards"> [https://stormwater.pca.state.mn.us/index.php?title=Total_Maximum_Daily_Loads_(TMDLs) '''total maximum daily loads''']</span>, can only be applied toward enhanced street sweeping. This is sweeping that results in pollutant reductions above pollutant reductions associated with sweeping that occurred at the <span title="The year from which stormwater practices can be credited toward meeting a total maximum daily load (TMDL) wasteload allocation (WLA)"> '''[https://stormwater.pca.state.mn.us/index.php?title=Baseline_year baseline year]'''</span>.
 +
*Accounting for seasonality: The image on the right illustrates the seasonal nature of phosphorus loading in areas where leaves and other organic sources are a source of phosphorus. Most models and other methods of estimating annual loads do not consider this seasonality and most likely significantly underestimates annual phosphorus loading. Accurate representation of impacts from enhanced street sweeping will require adjusting initial (baseline) calculations of loading. The MPCA is discussing appropriate methods for accounting for this seasonality.
 +
*Downstream BMPs: Enhanced street sweeping potentially impacts loading to and performance of downstream BMPs. The MPCA is discussing if adjustments in downstream loading and/or adjustments in BMP performance are needed to accurately determine changes in phosphorus loading in areas where enhanced street sweeping is implemented.
  
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[[Ecosystem Function of vegetation in stormwater management]]
 +
==Habitat==
 +
===Pollinators & Insects===
 +
===Birds===
 +
===Mammals===
 +
===Reptiles===
 +
===Amphibians===
 +
===Humans===
 +
===Aquatic Species===
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==Nutrient Cycling==
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===Primary Producers===
 +
===Terrestrial Food Chain===
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===Aquatic Food Chain===
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===Carbon Sequestration===
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===Oxygen & air quality benefits===
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==Soil Regeneration==
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<p dir="ltr" style="background-color:#d5fdf4; font-size:30px; text-align: center;" role="presentation" class="zfr3Q CDt4Ke">
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<a href="https://stormwater.pca.state.mn.us/index.php?title=Street_Sweeping_Phosphorus_Credit_Calculator_How-to-Guide">
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Donate
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</a>
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</p>
  
  
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<p dir="ltr" style="background-color:#d5fdf4; font-size:30px; text-align: center;" role="presentation" class="zfr3Q CDt4Ke">
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<a href="https://stormwater.pca.state.mn.us/index.php?title=Street_Sweeping_Phosphorus_Credit_Calculator_How-to-Guide">
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<span role="link" class="I4aHG">
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<span style="text-decoration:underline;" class="aw5Odc" data-ri="0">Donate
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</span>
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</span>
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</a>
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</p>
  
 
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<div class="mw-collapsible mw-collapsed" style="width:100%">
[[Stormwater and soil, engineered (bioretention) media, and media amendments]]
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'''BMPs'''
 
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<div class="mw-collapsible-content">
[[File:Bioretention media.png|300 px|thumb|alt=image bioretention|<font size=3>Engineered media in a bioretention practice. Image from [https://www.flickr.com/photos/mpcaphotos/albums/72157660843839122 MPCA's Flickr website.]</font size>]]
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<div class="mw-collapsible mw-collapsed" style="width:100%">
[[File:Compost image.png|300px|thumb|alt=compost image|<font size=3>Compost is an important component of most engineered media mixes. It is also commonly used as an amendment to improve soil properties, such as infiltration rate, fertility, and structure. Image from [https://www.flickr.com/photos/mpcaphotos/albums/72157647386550552 MPCA's Flickr website.]</font size>]]
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:'''Bioretention'''
 
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<div class="mw-collapsible-content">
{{alert|Engineered media is manufactured from soil (sand, silt, clay) and other components (e.g. compost, iron, etc.), in specific proportions, for a specific application (e.g. green roof, bioretention, tree box). Because engineered media are widely used in [[Bioretention|bioretention]] practices, the term "bioretention media" is widely used. We prefer the term "engineered media" as it more accurately describes the applicability of these media.|alert-info}}
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*[[Bioretention terminology]] (including types of bioretention)
 
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*[[Overview for bioretention]]
Soil and engineered media, often referred to as bioretention media, are fundamental design characteristics of most post-construction stormwater practices. In some applications, soil or media amendments are utilized to improve soil conditions or enhance treatment effectiveness of a BMP.
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*[[Design criteria for bioretention]]
 
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*[[Construction specifications for bioretention]]
This page provides links to pages that address topics related to soil, engineered media, and soil/media amendments.
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*[[Operation and maintenance of bioretention and other stormwater infiltration practices]]
 
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*[[Operation and maintenance of bioretention and other stormwater infiltration practices - supplemental information]]
*Media
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**[[Operation and maintenance of bioretention]] - we recommend using the above two pages
**[[Overview of engineered (bioretention) media]]
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*[[Assessing the performance of bioretention]]
**[[Engineered (bioretention) media materials specifications]]
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*[[Cost-benefit considerations for bioretention]]
**[[Stormwater engineered (bioretention) media mixes]]
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*[[Calculating credits for bioretention]]
**[[Engineered (bioretention) media applications for stormwater BMPs]]
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*[[Green Infrastructure benefits of bioretention]]
**[[Phosphorus leaching, export, and retention in engineered (bioretention) stormwater media]]
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*[[Soil amendments to enhance phosphorus sorption]]
**[[Review and summary of literature pertaining to engineered (bioretention) media]]
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*[[Summary of permit requirements for bioretention]]
**[[Engineered (bioretention) media selection tool]]
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*[https://stormwater.pca.state.mn.us/index.php?title=Category:Bioretention_photo Bioretention photos]
*Amendments
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*[https://stormwater.pca.state.mn.us/index.php?title=Category:Bioretention_schematic Bioretention schematics]
**[[Compost and stormwater management]]
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*[https://stormwater.pca.state.mn.us/index.php?title=Category:Bioretention_table Bioretention tables]
**[[Stormwater media amendments materials specifications]]
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*[[Supporting material for bioretention]]
**[https://stormwater.pca.state.mn.us/index.php?title=Soil_amendments_to_enhance_phosphorus_sorption Soil amendments to enhance phosphorus sorption]
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*[[External resources for bioretention]]
*Soil
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*[[References for bioretention]]
**[[Understanding and interpreting soils and soil boring reports for infiltration BMPs]]
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*[[Requirements, recommendations and information for using bioretention with no underdrain BMPs in the MIDS calculator]]
**[[Determining soil infiltration rates]]
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*[[Requirements, recommendations and information for using bioretention with an underdrain BMPs in the MIDS calculator]]</div>
**[[Design guidelines for soil characteristics - tree trenches and tree boxes]]
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</div>
**[[Guidance for amending soils with rapid or high infiltration rates]]
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<div class="mw-collapsible mw-collapsed" style="width:100%">
**[https://stormwater.pca.state.mn.us/index.php?title=Category:Soil_properties Soil properties]
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:'''Tree trenches'''
*Vegetation
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<div class="mw-collapsible-content">
**[[Minnesota plant lists]]
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*[[Design guidelines for tree quality and planting - tree trenches and tree boxes]]
**[https://stormwater.pca.state.mn.us/index.php?title=Plants_for_swales Plants for swales]
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*[[Design guidelines for soil characteristics - tree trenches and tree boxes]]
**[https://stormwater.pca.state.mn.us/index.php?title=Plant_lists_for_trees Plant lists for trees]
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*[[Construction guidelines for tree trenches and tree boxes]]
*Links
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*[[Protection of existing trees on construction sites]]
*[[Photo gallery for Stormwater and soil, engineered (bioretention) media, and media amendments]]
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*[[Operation and maintenance (O&M) of tree trenches and tree boxes]]
*Interesting websites
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*[[Operation and maintenance of tree trenches and tree boxes - supplemental information]]
-->
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**[[Operation and maintenance of tree trenches and tree boxes]] - we recommend using one of the above two pages
 
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*[[Assessing the performance of tree trenches and tree boxes]]
<!--
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*[[Calculating credits for tree trenches and tree boxes]]
==table test==
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*[[Case studies for tree trenches and tree boxes]]
{| class="wikitable" style="float:right; margin-left: 10px; width:500px; border: 5px solid red"
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*[[Soil amendments to enhance phosphorus sorption]]
|-
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*[[Green Infrastructure benefits of tree trenches and tree boxes]]
! style="background: red; color: yellow;" | Stabilization schedule must be no less than:
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*[[Summary of permit requirements for infiltration]]
|-
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*[[Tree trench/box photo gallery]]
| 14 days for all exposed soils
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*[[Fact sheet for tree trenches and tree boxes]]
|-
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*[[Requirements, recommendations and information for using trees as a BMP in the MIDS calculator]]
| 7 days if a discharge point is within one mile of a special  or impaired water
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*[[Requirements, recommendations and information for using trees with an underdrain as a BMP in the MIDS calculator]]
|-
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</div>
| 24 hours for areas within 200 ft of a public water during fish spawning times
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<div class="mw-collapsible mw-collapsed" style="width:100%">
|-
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:'''Permeable pavement'''
| 24 hours for areas of ditches and swales within 200 ft of the property edge or surface water discharge point and 14 days for remainder
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<div class="mw-collapsible-content">
|}
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*[[Overview for permeable pavement]]
 +
*[[Types of permeable pavement]]
 +
*[[Design criteria for permeable pavement]]
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*[[Construction specifications for permeable pavement]]
 +
*[[Assessing the performance of permeable pavement]]
 +
*[[Operation and maintenance of permeable pavement]]
 +
*[[Calculating credits for permeable pavement]]
 +
*[[Case studies for permeable pavement]]
 +
*[[Green Infrastructure benefits of permeable pavement]]
 +
*[[Summary of permit requirements for infiltration]]
 +
*[[Permeable pavement photo gallery]]
 +
*[[Additional considerations for permeable pavement]]
 +
*[[Links for permeable pavement]]
 +
*[[References for permeable pavement]]
 +
*[[Requirements, recommendations and information for using permeable pavement BMPs in the MIDS calculator]]
 +
*[[Fact sheets for permeable pavement]]
 +
*[[Recent news and information for permeable pavement]]
 +
</div>
 +
<div class="mw-collapsible mw-collapsed" style="width:100%">
 +
:'''Green roof'''
 +
<div class="mw-collapsible-content">
 +
*[[Overview for green roofs]]
 +
*[[Types of green roofs]]
 +
*[[Design criteria for green roofs]]
 +
*[[Construction specifications for green roofs]]
 +
*[[Assessing the performance of green roofs]]
 +
*[[Operation and maintenance (O&M) of green roofs]]
 +
*[[Operation and maintenance of green roofs - supplemental information]]
 +
**[[Operation and maintenance of green roofs]] - we recommend using the above two pages
 +
*[[Calculating credits for green roofs]]
 +
*[[Cost-benefit considerations for green roofs]]
 +
*[[Plant lists for green roofs]]
 +
*[[Case studies for green roofs]]
 +
*[[Links for green roofs]]
 +
*[[References for green roofs]]
 +
*[[Supporting material for green roofs]]
 +
*[[Green roofs terminology and glossary]]
 +
*[[Green roof fact sheet]]
 +
*[[Requirements, recommendations and information for using green roofs as a BMP in the MIDS calculator]]</div>
 +
</div>
 +
</div>
 
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Latest revision as of 21:10, 10 April 2023

This page was last edited on 10 April 2023, at 21:10.