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<table class="sortable"> | <table class="sortable"> | ||
<tr><th>Pollutant</th> | <tr><th>Pollutant</th> | ||
− | <th>Bioretention | + | <th>Bioretention cleansing mechanism</th> |
</tr> | </tr> | ||
<tr> | <tr> |
Summary of bioretention water quality cleansing mechanisms for common stormwater pollutants.
Link to this table
Pollutant | Bioretention cleansing mechanism |
---|---|
Total suspended solids | Sedimentation and filtration (e.g. Davis et al 2009) |
Metals | Filtration of particulate metals, sorption of dissolved metals into mulch layer (e.g. Davis et al, 2009), plant uptake (e.g. Toronto and Region Conservation, 2009) |
Nitrogen | Sorption; uptake by microbes and plant material, uptake into recalcitrant soil organic matter (e.g. Henderson, 2008) |
Phosphorus | Sorption, precipitation, plant uptake, uptake into recalcitrant soil organic matter (e.g. Henderson, 2008) |
Pathogens | Filtration, UV light, competition for limited nutrients, predation by protozoa and bacterial predators (e.g. Zhang et al 2010) |
Hydrocarbons | Filtration and sorption to organic matter and humic acids, then degraded by soil microbes (e.g. Hong et al 2006) |