STORMWATER CONTAMINANT REMOVAL BY CHEMICALS. SUMMARY REPORT
The Washington State Department of Transportation designs, operates, and maintains stormwater detention basins for flood control. Initiatives by the Washington State Department of Ecology have prioritized the consideration of stormwater quality as well as quantity for stormwater treatment. Modification of existing stormwater detention basins could afford an efficient mechanism for addressing water quality by enhancing contaminant removal. A scale model of a typical basin was constructed to investigate contaminant removal capabilities of existing detention basins. A simulated highway stormwater runoff was formulated and applied in scale model detention basin testing over a range of flow rates. Four coagulants were evaluated for their ability to enhance removal of sediment and metals. Coagulant addition resulted in significant increases in metal removal over the range of stormwater flow rates studied. The greatest improvement was observed at the higher flow rates. Enhanced metals removal resulted from increased removal of small particles and their sorbed metals. Further improvement in contaminant removal was observed following the addition of an influent baffle, resulting in improved basin hydraulic characteristics which increased solids detention and minimized short circuiting.
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Corporate Authors:
Washington State University, Pullman
Department of Civil and Environmental Engineering
P.O. Box 642910
Pullman, WA United States 99164-2910Washington State Department of Transportation
Transportation Building, 310 Maple Park Avenue SE, P.O. Box 47300
Olympia, WA United States 98504-7300Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC United States 20590 -
Authors:
- Price, F
- Yonge, D R
- Publication Date: 1995-4
Language
- English
Media Info
- Features: Appendices; Figures; References; Tables;
- Pagination: 37 p.
Subject/Index Terms
- TRT Terms: Catch basins; Coagulation; Contaminants; Detention basins; Drainage; Flow; Hydraulics; Improvements; Metals; Runoff; Scale models; Sediments; Testing; Water quality
- Uncontrolled Terms: Baffles; Flow rate; Removal
- Subject Areas: Bridges and other structures; Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw;
Filing Info
- Accession Number: 00681886
- Record Type: Publication
- Report/Paper Numbers: WA-RD 358.1
- Contract Numbers: T9234-11
- Files: TRIS, USDOT, STATEDOT
- Created Date: Jul 14 1995 12:00AM