Difference between revisions of "BMP pollutant removal for phosphorus"
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<td rowspan="3">Filtration</td> | <td rowspan="3">Filtration</td> | ||
<td>Sand filter</td> | <td>Sand filter</td> | ||
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<td>50</td> | <td>50</td> | ||
| + | <td>55</td> | ||
<td>0</td> | <td>0</td> | ||
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<td>Dry swale</td> | <td>Dry swale</td> | ||
<td>0</td> | <td>0</td> | ||
| − | <td> | + | <td>35</td> |
<td>0</td> | <td>0</td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Wet swale</td> | <td>Wet swale</td> | ||
| − | <td> | + | <td>0</td> |
| − | <td> | + | <td></td> |
| − | <td> | + | <td>0</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
Revision as of 22:09, 16 June 2014
This table shows comparison of phosphorus removal for different BMPs.a,e,f Values represent the percent of incoming pollutant that is removed. Source: MPCA Minnesota Stormwater Manual.
Link to this table
| BMP group | BMP design variation | Average TP removal rate (%)b | Maximum TP removal rate (%)c | Average soluble P removal rate (%)d,f,g |
|---|---|---|---|---|
| Bioretentionf | Underdrain | see Phosphorus credits for bioretention systems with an underdrain | see Phosphorus credits for bioretention systems with an underdrain | see Phosphorus credits for bioretention systems with an underdrain |
| Infiltrationh | 100 | 100 | 100 | |
| Filtration | Sand filter | 50 | 55 | 0 |
| Dry swale | 0 | 35 | 0 | |
| Wet swale | 0 | 0 | ||
| Infiltrationf | Infiltration trenchh | 100 | 100 | 100 |
| Infiltration basinh | 100 | 100 | 100 | |
| Stormwater ponds | Wet pond | 50 | 65 | 0 |
| Multiple pond | 60 | 75 | 0 | |
| Stormwater wetlands | Shallow wetland | 40 | 55 | 0 |
| Pond/wetland | 55 | 75 | 0 |
aRemoval rates show in table are a composite of five sources:
- Caraco (Center for Watershed protection, 2001)
- Maryland Department of the Environment](2000)
- Winer (Center for Watershed Protection, 2000)
- P8 modeling (William Walker)
b Average removal efficiency expected under MPCA Sizing Rules 1 and 3
c Upper limit on phosphorus removal with increased sizing and design features, based on national review
d Average rate of soluble phosphorus removal in the literature
e See section on calculating credits for each BMP in this Manual.
f Note that the performance numbers apply only to that portion of total flow actually being treated; it does not include any runoff that bypasses the BMP
gNote that soluble P can transfer from surface water to groundwater, but this column refers only to surface water
hNote that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff or runoff diverted via underdrain does not receive this level of treatment.