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A seventeen-day pilot operation demonstrated the feasibility of microsand ballasted flocculation and clarification for removal of TSS, oil & grease, and multiple regulated metals from steel plant wastewater. The process was insensitive to varying influent conditions tested including
normal and simulated “worst case” conditions. Overflow rates of 25 and 75 gpm/ft2, equivalent to 25,000 gpm process and 150,000 gpm combined process/stormwater flows, were tested. Average removal efficiencies of 96% for TSS and 92% for oil &
grease were achieved. Effluent copper concentrations below 6.1 μg/l and nickel concentrations below 20 μg/l were also achieved. Various process pH's and sulfide dosages were evaluated for compliant metals removal. For influent copper and nickel concentrations below 140 μg/l,
a pH of 10.5 and 3 mg/l (as S) sulfide addition proved optimal.
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