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COMBINATION OF A SOURCE REMOVAL REMEDY AND BIOREMEDIATION FOR THE TREATMENT OF A TCE CONTAMINATED AQUIFER
Citation:
AZADPOUR-KEELEY, ANN. COMBINATION OF A SOURCE REMOVAL REMEDY AND BIOREMEDIATION FOR THE TREATMENT OF A TCE CONTAMINATED AQUIFER. Presented at First International Conference on DNAPL Characterization and Remediation, Pittsburg, PA, September 25 - 29, 2006.
Impact/Purpose:
To inform the public.
Description:
Historical disposal practices of chlorinated solvents have resulted in the widespread contamination of ground-water resources. These ground-water contaminants exist in the subsurface as free products, residual and vapor phases, and in solution. The remediation of these contaminates often require a sequenced train of treatments, the success of which is ultimately dependent on the hydraulic control of local flow regimes. Although each phase requires specialized technologies, the removal of dissolved nonaqueous phase liquid (DNAPL) from ground water is important in preventing migration to sources of water use until long after contaminants at the source have been removed. The focus of this study was to employ a ground-water treatment involving both biological and chemical processes; in situ chemical oxidation (ISCO) with potassium permanganate (KMnO4) for the removal of the source and bioremediation as a polishing step. However, the efficacy of bioremedial processes may be complicated due to potential adverse effects of ISCO on the indigenous microbial populations responsible for reductive dechlorination of chlorinated constituents. Molecular microbiological examination of core materials obtained post-ISCO treatment indicated that microorganisms capable of reductive dechlorination are capable of surviving exposure to potassium permanganate.