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IN-SITU REDUCTION OF CHROMATE-CONTAMINATED SOILS AND SEDIMENTS BY SODIUM DITHIONITE: A FIELD-SCALE STUDY
Citation:
Paul*, C J., F A. Khan*, AND R W. Puls*. IN-SITU REDUCTION OF CHROMATE-CONTAMINATED SOILS AND SEDIMENTS BY SODIUM DITHIONITE: A FIELD-SCALE STUDY. Presented at Gen. Info. AGU 1999 Fall Meeting, San Francisco, CA, 12/13-17/1999.
Description:
A chrome-plating shop had been the source of discharges of acidic chromium wastes into the soils and groundwater beneath the shop at the USCG Support Center near Elizabeth City, NC. An initial characterization of the site was conducted in 1990 and 1991 to determine the extent of soil and aquifer contamination by chromium and Cr(VI). Laboratory studies and a field-scale pilot study using zero-valent iron led to the installation of an in situ permeable reactive barrier (PRB) in1996 to remediate the diffuse chromate plume at the site. While PRB treatment has proven effective for remediating the contaminant plume, its long-term effectiveness is unknown, therefore, the chromium source must be treated in order to ultimately meet remedial performance objectives. The objective of this study was to conduct a field-scale pilot study using a liquid reductant to create a spatially-fixed reducing zone in order to remediate chromate-laden soils and sediments underlying the chrome plating shop.