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FIELD EVALUATION OF IN-SITU REDOX MANIPULATION FOR REMEDIATING CHROMIUM CONTAMINATED GROUND WATER AND SEDIMENT
Citation:
Khan*, F A., R W. Puls*, C J. Paul*, AND M S. McNeil*. FIELD EVALUATION OF IN-SITU REDOX MANIPULATION FOR REMEDIATING CHROMIUM CONTAMINATED GROUND WATER AND SEDIMENT. Presented at RTDF Permeable Reactive Barriers Action Team Meeting, Melbourne, FL, 02/16-17/2000.
Description:
Historical data from the electroplating shop at the U.S Coast Guard Air Support Center site, Elizabeth City, North Carolina, suggested that the elevated Cr(VI) in the capillary fringe area had contaminated the ground water. Most of the mobile Cr(VI) is present in the capillary zone of the aquifer under an oxidizing environment. The reduction of Cr(VI) to Cr(III) through in-situ redox manipulation in the presence of a reductant is an innovative technique for remediating chromate-contaminated sediments and ground water. The purpose of this field study was to apply sodium dithionite by injecting it into a capillary fringe zone where elevated Cr(VI) has been identified, and to evaluate its effectiveness in creating a redudtive zone to remediate Cr(VI). Results indicated that rememdial treatment of Cr(VI) in the ground water and the capillary fringe area is possible by injecting sodium dithionite. Based on the preliminary results of this field study, the use of sodium dithionite appears to be a viable option for a full-scale remedial approach in the electroplating shop at the U.S. Coast Guard Air Support Center site.