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{{alert|''Reference to specific commercial products, processes, or services by trade name, trademark, service mark, manufacturer, or otherwise does not constitute or imply endorsement, recommendation, or favoring by the Minnesota Pollution Control Agency. ''|alert-info}} | {{alert|''Reference to specific commercial products, processes, or services by trade name, trademark, service mark, manufacturer, or otherwise does not constitute or imply endorsement, recommendation, or favoring by the Minnesota Pollution Control Agency. ''|alert-info}} | ||
− | + | Contech's StormFilter using PhosphoSorb Media is an engineered media filtration system designed to filter pollutants from stormwater runoff. It is classified as a <span title="A manufactured treatment device (mtd) is a pre-fabricated stormwater treatment structure utilizing settling (sedimentation), filtration, absorptive/adsorptive materials, vortex separation, vegetative components, and/or other appropriate technology to remove pollutants from stormwater runoff. MTDs are typically proprietary devices."> '''manufactured treatment device'''</span> (mtd). | |
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− | Contech's StormFilter using PhosphoSorb Media is an engineered | ||
This page provides information on pollutant removal credits for StormFilter using PhosphoSorb Media, links to supporting information, and links to information on system design, inspection, operation, and maintenance. | This page provides information on pollutant removal credits for StormFilter using PhosphoSorb Media, links to supporting information, and links to information on system design, inspection, operation, and maintenance. | ||
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***Comply with [https://www.conteches.com/Portals/0/Documents/Design%20Guides/StormFilter-Config-Guide.pdf?ver=2018-05-16-083627-317 appropriate configurations] and [https://stormwater.pca.state.mn.us/index.php?title=Contech_StormFilter_using_PhosphoSorb_Media#Use_conditions Use conditions] | ***Comply with [https://www.conteches.com/Portals/0/Documents/Design%20Guides/StormFilter-Config-Guide.pdf?ver=2018-05-16-083627-317 appropriate configurations] and [https://stormwater.pca.state.mn.us/index.php?title=Contech_StormFilter_using_PhosphoSorb_Media#Use_conditions Use conditions] | ||
*TP: Tier 2 | *TP: Tier 2 | ||
− | **Credit: | + | **Credit: 60 percent removal |
**Conditions for receiving credit | **Conditions for receiving credit | ||
***Must meet Tier 1 conditions. | ***Must meet Tier 1 conditions. | ||
− | ***DP should be 25 percent or less of TP. For a discussion of conditions where DP is likely to exceed 25 of TP, [https://stormwater.pca.state.mn.us/index.php?title=TP_and_TSS_credits_and_guidance_for_manufactured_treatment_devices_(mtds)#Applicability_of_Tier_2_TP_credits link here]. TP removal should be adjusted when DP fractions exceed 25%, as described at the link provided above. | + | ***DP should be 25 percent or less of TP. For a discussion of conditions where DP is likely to exceed 25% of TP, [https://stormwater.pca.state.mn.us/index.php?title=TP_and_TSS_credits_and_guidance_for_manufactured_treatment_devices_(mtds)#Applicability_of_Tier_2_TP_credits link here]. TP removal should be adjusted when DP fractions exceed 25%, as described at the link provided above. |
***Inspect manufactured treatment device monthly during the frost free season for the first year of operation after construction. Conduct inspections following manufacturer’s instructions/recommendations. Use maintenance indicators provided by manufacturers to determine if maintenance is needed. Maintenance procedures should follow manufacturer’s guidelines. Determine future inspection and maintenance schedules from findings during the first year of operation. | ***Inspect manufactured treatment device monthly during the frost free season for the first year of operation after construction. Conduct inspections following manufacturer’s instructions/recommendations. Use maintenance indicators provided by manufacturers to determine if maintenance is needed. Maintenance procedures should follow manufacturer’s guidelines. Determine future inspection and maintenance schedules from findings during the first year of operation. | ||
− | * | + | **Recommended Tier 3 value = 70%. |
− | ** | + | ***The practice contains perlite, which contains aluminum oxides that can sorb dissolved phosphorus. |
+ | ***Total phosphorus removal by the device in TAPE studies was greater than for other mtds and showed removal of dissolved P (SRP), although DP concentrations were low (typically less than 0.05 mg/L). TP removal may have been influenced by very high TSS influent concentrations (>300 mg/L). | ||
+ | ***In a study conducted at [https://swbmpvwrrc.wp.prod.es.cloud.vt.edu/wp-content/uploads/2017/10/Filter_Application_StormFilter-w-Phosphosorb-media_Item-4.pdf Mitchell Community College in North Carolina] (2012), median and mean removal of DP was 69 and 74 percent, respectively. Sample size was 5. | ||
+ | ***In a laboratory study by Lenart et al., the media achieved DP removal of 70% for 1000 pore volumes and 55% for 2000 pore volumes. Influent consisted of 0.5 mg/l Potassium Dihydrogen Phosphate | ||
+ | ***In a study conducted by [https://ascelibrary.org/doi/abs/10.1061/(ASCE)IR.1943-4774.0000291 Ma et al.] (2011) and published in the Journal of Irrigation and Drainage Engineering, adsorption isotherms for the engineered media (later incorporated into the Phosphosorb device) indicated significant removal of dissolved phosphorus. Removal rates were approximately 50% up to 500 pore volumes and 70% after 2000 pore volumes. Influent concentration was 0.5 mg/L DP. | ||
+ | ***Conclusion: Studies suggest Phosphorsorb can achieve long-term DP removal of 30 to 50%. | ||
+ | ***Currently mtd TP removal values in the Manual are based on the assumption that particulate P accounts for 75% of TP. Assuming a 30% removal value and a DP fraction of 25%, and with a TP removal of 60% for this device based only on PP removal, the TP removal is 70% (60 + 10). | ||
**Conditions for receiving credit | **Conditions for receiving credit | ||
***Must meet Tier 1 and Tier 2 conditions | ***Must meet Tier 1 and Tier 2 conditions | ||
+ | ***Tier 2 and Tier 3 credits assume PP:TP ratio of 0.75:1 and no dissolved phosphorus removal | ||
For more information on credits, see [[TP and TSS credits and guidance for manufactured treatment devices (mtds)]] | For more information on credits, see [[TP and TSS credits and guidance for manufactured treatment devices (mtds)]] | ||
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#Systems are designed to treat a specified water quality volume or annual average runoff volume. The annual average runoff treated can be determined using [https://stormwater.pca.state.mn.us/index.php?title=TP_and_TSS_credits_and_guidance_for_manufactured_treatment_devices_(mtds)#Calculating_annual_volume_treated methods that are specified here]. | #Systems are designed to treat a specified water quality volume or annual average runoff volume. The annual average runoff treated can be determined using [https://stormwater.pca.state.mn.us/index.php?title=TP_and_TSS_credits_and_guidance_for_manufactured_treatment_devices_(mtds)#Calculating_annual_volume_treated methods that are specified here]. | ||
#Each site plan must undergo Contech StormFilter review before approval of the unit for site installation. | #Each site plan must undergo Contech StormFilter review before approval of the unit for site installation. | ||
− | #StormFilter media shall conform to the specifications described in | + | #StormFilter media shall conform to the specifications described in Specifications and shall be sourced from Contech Engineered Solutions, LLC with no substitutions. |
#Follow maintenance procedures given in the most recent version of the [https://www.conteches.com/Portals/0/Documents/Maintenance%20Guides/StormFilter-Maintenance-Guide.pdf?ver=2018-05-31-143302-143 StormFilter Operation and Maintenance Manual]. | #Follow maintenance procedures given in the most recent version of the [https://www.conteches.com/Portals/0/Documents/Maintenance%20Guides/StormFilter-Maintenance-Guide.pdf?ver=2018-05-31-143302-143 StormFilter Operation and Maintenance Manual]. | ||
#Install the StormFilter in such a manner that flows exceeding the maximum StormFilter operating rate are conveyed around the StormFilter media and will not resuspend captured sediment. | #Install the StormFilter in such a manner that flows exceeding the maximum StormFilter operating rate are conveyed around the StormFilter media and will not resuspend captured sediment. | ||
#Discharges from the StormFilter units shall not cause or contribute to water quality standards violations in receiving waters. | #Discharges from the StormFilter units shall not cause or contribute to water quality standards violations in receiving waters. | ||
− | *When applicable, adhere to use conditions provided in Washington State Department of Ecology's report (Ecology's Conditions of Use) [https:// | + | *When applicable, adhere to use conditions provided in Washington State Department of Ecology's report (Ecology's Conditions of Use) [https://fortress.wa.gov/ecy/ezshare/wq/tape/use_designations/STORMFILTERphosphosorbCONTECHguld.pdf GENERAL USE LEVEL DESIGNATION FOR BASIC (TSS) AND PHOSPHORUS TREATMENT For CONTECH Engineered Solutions Stormwater Management StormFilter® with PhosphoSorb® media]. Note that some information in this report is specific to Washington State and not applicable to Minnesota. |
===Data analysis=== | ===Data analysis=== | ||
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Meet the conditions specified for [https://stormwater.pca.state.mn.us/index.php?title=Contech_StormFilter_using_PhosphoSorb_Media#TP_and_TSS_credits the appropriate TP and/or TSS credit]. | Meet the conditions specified for [https://stormwater.pca.state.mn.us/index.php?title=Contech_StormFilter_using_PhosphoSorb_Media#TP_and_TSS_credits the appropriate TP and/or TSS credit]. | ||
− | Meet the | + | Meet the conditions specified in [https://www.conteches.com/Portals/0/Documents/Maintenance%20Guides/StormFilter-Maintenance-Guide.pdf?ver=2018-05-31-143302-143 StormFilter Inspection and Maintenance Procedures], unless conditions for [https://stormwater.pca.state.mn.us/index.php?title=Contech_StormFilter_using_PhosphoSorb_Media#TP_and_TSS_credits the appropriate TP and/or TSS credit] are more stringent. |
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==Links== | ==Links== | ||
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*Ma, J., J. H. Lenhart, K. Tracy. 2011. Orthophosphate Adsorption Equilibrium and Breakthrough on Filtration Media for Storm-Water Runoff Treatment. Journal of Irrigation and Drainage Engineering 137(4):244-250. DOI:10.1061/(ASCE)IR.1943-4774.0000291. | *Ma, J., J. H. Lenhart, K. Tracy. 2011. Orthophosphate Adsorption Equilibrium and Breakthrough on Filtration Media for Storm-Water Runoff Treatment. Journal of Irrigation and Drainage Engineering 137(4):244-250. DOI:10.1061/(ASCE)IR.1943-4774.0000291. | ||
− | [[Category: | + | [[Category:Level 3 - Best management practices/Structural practices/Proprietary devices]] |
Contech's StormFilter using PhosphoSorb Media is an engineered media filtration system designed to filter pollutants from stormwater runoff. It is classified as a manufactured treatment device (mtd).
This page provides information on pollutant removal credits for StormFilter using PhosphoSorb Media, links to supporting information, and links to information on system design, inspection, operation, and maintenance.
When conditions described in this section are met, applicable Contech StormFilter using PhosphoSorb Media systems are approved for the following removals for total suspended solids (TSS) and total phosphorus (TP).
For more information on credits, see TP and TSS credits and guidance for manufactured treatment devices (mtds)
For a discussion of StormFilter configurations, link here.
To receive the full credit, StormFilter systems must comply with the following conditions.
Credits apply only to the water being treated by a device. The applicable treatment volume must be determined using one of the methods described here.
The Tier 1 credit equals the TAPE-approved credits. Tier 2 credit was determined by analyzing water quality data collected at ZigZag, Oregon. The site consisted of transportation land use with 0.063 acres of impervious draining to the device. The system contained one 18-inch StormFilter cartridge with PhosphoSorb media operating at a specific flow rate 1.67 gpm/ft2 or 12.5 gpm per 18-inch tall cartridge.
MPCA compiled data from Appendix D of the report The Stormwater Management StormFilter® PhosphoSorb® at a Specific Flow Rate of 1.67 gpm/ft2 General Use Level Designation Technical Evaluation Report. Below are summary statistics for the device.
TAPE means and medians represent values meeting TAPE criteria for TP (inflow concentrations of 0.1 to 0.5 mg/L) and TSS (inflow concentrations greater than 20 mg/L). Of the 22 samples, TAPE medians and means represent 16 samples for TP and 17 samples for TSS.
The Tier 3 credit of 70% is based on the following.
Meet the conditions specified for the appropriate TP and/or TSS credit.
Meet the conditions specified in StormFilter Inspection and Maintenance Procedures, unless conditions for the appropriate TP and/or TSS credit are more stringent.
This page was last edited on 15 February 2023, at 16:47.