Difference between revisions of "Pretreatment"
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===Concentrated underground flow=== | ===Concentrated underground flow=== | ||
This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ | This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the [http://etvcanada.ca/ Environmental Technology Verification (ETV)] program. | ||
<table class = "table table-striped table-responsive"> | <table class = "table table-striped table-responsive"> | ||
<caption><strong>Inline pretreatment options</strong></caption> | <caption><strong>Inline pretreatment options</strong></caption> | ||
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<td>Baffles slow flow, encouraging larger, heavier particles to drop out of the water column. A skimmer may also trap floating debris, oils and grease. </td> | <td>Baffles slow flow, encouraging larger, heavier particles to drop out of the water column. A skimmer may also trap floating debris, oils and grease. </td> | ||
<td>-</td> | <td>-</td> | ||
<td>[http://upstreamtechnologies.us/products/safl.shtml | <td>[http://upstreamtechnologies.us/products/safl.shtml SAFL baffle]</td></tr> | ||
<tr> | <tr> | ||
<td>Hydrodynamic OGS</td> | <td>Hydrodynamic OGS</td> | ||
<td>The shape causes rapidly flowing water to form a vortex which forces the larger, heavier particles are outwards and downwards into a lower chamber. Floating debris, oils and grease are trapped behind a baffle or in small tank area, towards the top of the main vortex chamber</td> | <td>The shape causes rapidly flowing water to form a vortex which forces the larger, heavier particles are outwards and downwards into a lower chamber. Floating debris, oils and grease are trapped behind a baffle or in small tank area, towards the top of the main vortex chamber</td> | ||
<td> | <td> | ||
[http://www.conteches.com/Products/Stormwater-Management/Treatment/CDS.aspx | [http://www.conteches.com/Products/Stormwater-Management/Treatment/CDS.aspx CDS]<br> | ||
[https://www.hydro-int.com/en/products/downstream-defender | [https://www.hydro-int.com/en/products/downstream-defender Downstream defender]<br> | ||
[http://nextstorm.ca/sdd/ | [http://nextstorm.ca/sdd/ SDD] | ||
</td> | </td> | ||
<td> [http://www.imbriumsystems.com/stormwater-treatment-solutions/stormceptor-systems | <td> [http://www.imbriumsystems.com/stormwater-treatment-solutions/stormceptor-systems Stormceptor]</td></tr> | ||
<tr><td>Cartridge filters</td> | <tr><td>Cartridge filters</td> | ||
<td>Uses membrane technology adopted from water treatment plants. </td> | <td>Uses membrane technology adopted from water treatment plants. </td> | ||
<td>-</td> | <td>-</td> | ||
<td>[http://www.imbriumsystems.com/stormwater-treatment-solutions/jellyfish-filter | <td>[http://www.imbriumsystems.com/stormwater-treatment-solutions/jellyfish-filter Jellyfish]</td></tr> | ||
<tr><td>Catchbasin inserts</td> | <tr><td>Catchbasin inserts</td> | ||
<td>Great for retrofitting situations, to improve water quality</td> | <td>Great for retrofitting situations, to improve water quality</td> | ||
<td>[http://www.cbshield.com/ | <td>[http://www.cbshield.com/ CB Shield]</td> | ||
<td> [http://upstreamtechnologies.us/products/snout.shtml | <td> [http://upstreamtechnologies.us/products/snout.shtml Snout]</td></tr> | ||
</table> | </table> | ||
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This article is particularly heavy on proprietary systems and information. Please inform us of any omissions or broken links using the | This article is particularly heavy on proprietary systems and information. Please inform us of any omissions or broken links using the box below: | ||
[[category: Pretreatment]] | [[category: Pretreatment]] |
Revision as of 14:50, 8 August 2017
Overland sheet flow[edit]
The following pretreatements are recommended where sheet flow is being directed to a BMP (typically a bioretention cell) from the edge of an impermeable surface such as an asphalt parking lot or a paved plaza:
A gravel diaphragm typically requires less setback between the catchment and the BMP. Where space permits, these two designs can be used in combination to even greater effect!
Concentrated overland flow[edit]
Where a curb cut, a disconnected downspout or a swale directs surface water to a point, increasing the flow rate, one or more of the following pretreatments should be considered:
- Forebays (well suited for bioretention cells)
- Sand filters (well suited for underground infiltration)
- Screens and racks
Concentrated underground flow[edit]
This type of pretreatement is dominated by proprietary systems, some of which have undergone verification under the Environmental Technology Verification (ETV) program.
Type | Description | ETV products | Other products (not verified) |
---|---|---|---|
OGS Baffles | Baffles slow flow, encouraging larger, heavier particles to drop out of the water column. A skimmer may also trap floating debris, oils and grease. | - | SAFL baffle |
Hydrodynamic OGS | The shape causes rapidly flowing water to form a vortex which forces the larger, heavier particles are outwards and downwards into a lower chamber. Floating debris, oils and grease are trapped behind a baffle or in small tank area, towards the top of the main vortex chamber | Stormceptor | |
Cartridge filters | Uses membrane technology adopted from water treatment plants. | - | Jellyfish |
Catchbasin inserts | Great for retrofitting situations, to improve water quality | CB Shield | Snout |
Resources[edit]
This article is particularly heavy on proprietary systems and information. Please inform us of any omissions or broken links using the box below: