United States Department of Transportation
i
Bacteria Removal from Stormwater Runoff Using Steel Byproduct Filters [Research Brief]
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2024-08-01
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[PDF-1.19 MB]
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Abstract:The objectives of this project are to determine the long-term capability of steel chips and steel slag to remove E. Coli from stormwater and provide recommendations on using these steel byproducts for field stormwater filtration applications. Laboratory batch and column experiments were conducted to evaluate the impact of material aging and mixing ratios on the E. coli removal capabilities of steel chips and steel slag. After the laboratory study, a three-year field study was performed to determine the long-term performance of a steel byproduct filter. The field study was conducted using an existing steel byproduct filter installed at a residential stormwater detention pond in the City of Brookings. The field filter was composed of 50% steel slag and 50% steel chips during the first two years, and this ratio was modified to 70% steel slag and 30% steel chips during the last year of the field study. The steel byproduct filter’s efficiency at removing E. Coli and phosphate during different storm events was determined.
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