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FIELD EVALUATION OF THE SOLVENT EXTRACTION RESIDUAL BIOTREATMENT (SERB) TECHNOLOGY
Citation:
Mravik*, S C., R. K. Sillan, A L. Wood*, AND G. W. Sewell. FIELD EVALUATION OF THE SOLVENT EXTRACTION RESIDUAL BIOTREATMENT (SERB) TECHNOLOGY. ENVIRONMENTAL SCIENCE AND TECHNOLOGY 37(21):5040-5049, (2003).
Description:
The Solvent Extraction Residual Biotreatment (SERB) technology was demonstrated at the former Sage's Dry Cleaner site in Jacksonville, FL where an area of PCE (tetrachloroethylene) contamination was identified. The SERB technology is a treatment train approach to complete site restoration, which combines an active in situ DNAPL (dense nonaqueous phase liquid) removal technology, cosolvent extraction with an enhanced in situ bioremediation technology, reductive dechlorination. During the in situ cosolvent extraction test approximately 2.5 pore volumes of ethanol was flushed through the contaminated zone which removed approximately 60% of the estimated PCE mass. Approximately 2.72 kL of ethanol was left in the subsurface, which provided electron donor in close proximity to the electron acceptor, PCE. Quarterly ground water monitoring for over two years showed decreasing concentrations of PCE along with the formation of daughter products (cis-DCE, vinyl chloride, ethene). In conjunction with the production of dissolved methane and hydrogen and the removal of sulfate, these measurements indicate that in situ biotransformation of PCE has been enhanced in areas exposed to the residual ethanol. Zero order rate constants for individual wells ranged from 0 to 0.58 mol/L/day for cis-DCE formation and from 0 to -0.49 mol/L/day for PCE removal. First order rate constants based on total mass from contour plots of the data were -50 yr-1 for PCE, 0.75 yr-1 for cis-DCE, and -0.33 yr-1 for ethanol.