Stormwater treatment system
AssigneeThe Board of Governors for Higher Education, State of Rhode Island and Providence Plantations
InventorsLeon Thiem, Rhett Grant
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Abstract
A stormwater treatment system which comprises a housing having a first filter layer and a second filter layer positioned within the housing. The first filter layer absorbs contaminants from stormwater to produce a first treated stormwater having an effluent concentration that meets the USEPA Water Quality Criteria when stormwater permeates the first layer. The second filter layer precipitates substantially all of the dissolved contaminants remaining in the first treated stormwater when the first treated storm water permeates through the second filter layer.
Claims10
A stormwater treatment system which comprises:
- a housing having a first aperture positioned downstream of a second aperture;
- a first filter layer and a second filter layer comprised of crushed concrete comprising CaO positioned within the housing;
- and
- a separator layer disposed between the first filter layer and the second filter layer, the first filter layer absorbing contaminants from stormwater to produce a first treated stormwater and the second filter layer having a controlled pH within a range of between about 9-11 to precipitate substantially all of the dissolved contaminants remaining in the first treated stormwater when the stormwater flows into the first aperture, permeates through the first filter layer, the separator layer and the second filter layer and flows out of the second aperture.
A method for treating stormwater runoff which comprises:
- permeating the stormwater through a first medium to produce a first treated stormwater;
- and
- flowing the first treated stormwater through a second medium comprised of crushed concrete having a pH within a range of between about 9-11 to precipitate substantially all of the dissolved contaminants remaining in the first treated stormwater.
Dependencies are inferred from the claim text.