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IN SITU CHEMICAL REDUCTION OF CR(VI) IN GROUNDWATER USING A COMBINATION OF FERROUS SULFATE AND SODIUM DITHIONITE: A FIELD INVESTIGATION
Citation:
LUDWIG, R. D., C. SU, T. R. LEE, R. T. WILKIN, STEVE ACREE, R. R. ROSS, AND ANN KEELEY. IN SITU CHEMICAL REDUCTION OF CR(VI) IN GROUNDWATER USING A COMBINATION OF FERROUS SULFATE AND SODIUM DITHIONITE: A FIELD INVESTIGATION. ENVIRONMENTAL SCIENCE AND TECHNOLOGY. American Chemical Society, Washington, DC, 41(15):5299-5305, (2007).
Impact/Purpose:
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Description:
A field pilot test was conducted to evaluate the effectiveness of a FeSO4 + Na2S2O4 reductant solution blend for in situ saturated zone treatment of dissolved-phase Cr(VI) at the former Macalloy Corporation site in Charleston, SC. The reductant blend was injected into the path of a Cr(VI) plume and groundwater monitoring was subsequently conducted over a period of 1020 days. Treatment of Cr(VI) from concentrations greater than 4 mg/L to concentrations less than 0.01 mg/L was observed over the entire evaluation period of 1020 days. Sustained treatment is attributed to reduction of Cr(VI) to Cr(III) by ferrous iron adsorbed to, precipitated on, and/or incorporated into aquifer solid surfaces within the treatment zone.