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==Overview==
==Overview==
Oil and Grit Separators (OGS) are Manufactured Treatment Devices (MTDs) used for water quality treatment of stormwater runoff through the removal of large particle suspended solids and associated pollutants, and debris. Some devices can also trap light liquids such as oil and other floatables. These MTDs are typically installed underground within the stormwater sewer system in an on-line or off-line configuration. They are distinguished from [[Pretreatment|Filtration-based MTDs]] by their removal of solids through settling rather than filtration.
Oil and Grit Separators (OGS) are Manufactured Treatment Devices (MTDs) used for water quality treatment of stormwater runoff through the removal of large particle suspended solids and associated pollutants, and debris. Some devices can also trap light liquids such as oil and other floatables. These MTDs are typically installed underground within the stormwater sewer system in an on-line or off-line configuration. They are distinguished from [[Pretreatment|Filtration-based MTDs]] by their removal of solids through settling rather than filtration.
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==Performance Test Results==
The Procedure for Laboratory Testing of Oil Grit Separators provides performance testing for the following performance measures based on a standard sediment particle size distribution:
# '''Sediment removal performance''': Mass balance testing at seven surface loading rates to determine the capacity of MTDs to retain solids
# '''Sediment scour and re-suspension test''': Sediment is pre-loaded into the unit and effluent concentrations are measure at five surface loading rates to determine how well the units retain captured sediment.
# '''Light liquid capture and retention test''': An optional test in which beads with a density similar to motor oil are pre-loaded into the unit and the number of beads in the effluent are measured to assess the capacity of the unit to trap and retain light liquids.
There are currently eight OGS vendors with ISO 14034 verifications (as shown in the [[Oil and Grit Separator#Testing and Verification|table]] above). The list of manufacturers and test results of all OGS products and other verified technologies can be found [https://etvcanada.ca/home/verify-your-technology/current-verified-technologies/ here]. Sediment removal performance results were relatively consistent across different MTD designs, with slightly more variation at higher surface loading rates (see Graph below). <br>
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'''<small>*Note:''' Oil Grit Separators do not achieve the 80% removal efficiency required for stand alone application in Ontario, even at very low flow rates.</small>