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FIELD EVALUATION OF SOLVENT EXTRACTION RESIDUAL BIOTREATMENT (SERB)
Citation:
Sewell*, G W., S C. Mravik*, AND A L. Wood*. FIELD EVALUATION OF SOLVENT EXTRACTION RESIDUAL BIOTREATMENT (SERB). Presented at Contaminated Soil 2000, ConSoil 2000, Leipzig, GERMANY, September 18 - 22, 2000.
Impact/Purpose:
Purpose was to conduct field tests to examine the feasibility and benefits of coupling cosolvent flushing with bioremediation processes to achieve cleanup goals
Description:
Laboratory and pilot-scale studies have demonstrated that cosolvent-enhanced in situ extraction can remove residual and free-phase nonaqueous phase liquid (NAPL), but may leave levels of contaminants in the ground water and subsurface formations in excess of the regulatory requirements for site closure. Recent laboratory and field tests have examined the feasibility and benefits of coupling cosolvent flushing with bioremediation processes to achieve cleanup goals. The potential for residual cosolvent to stimulate in situ biotreatment, following partial dense nonaqueous phase liquid (DNAPL) source removal by alcohol-induced dissolution, was evaluated at a former dry cleaner site in Jacksonville, Florida. Contaminant and geochemical monitoring at the site suggests that biotransformation of the tetrachloroethylene (PCE) was enhanced and significant levels of cis-dichloroethylene (cis-DCE) were produced in areas exposed to residual cosolvent. Monitoring data indicates that the bioattenuation processes are sustainable and may result in complete dechlorination of site contaminants in 24 to 240 years.