Impact of Chlorofluorocarbon 113 on Chlorinated Ethene Biodegradation |
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Authors: | David M. Bagley Ian G. Sutherland Brent E. Sleep |
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Affiliation: | a University of Toronto, Department of Civil Engineering, Toronto, Ontario, Canada |
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Abstract: | The inhibition of tetrachloroethene (PCE) degradation in anaerobic, ethanol-fed PCE-enrichment cultures by chlorofluorocarbon 113 (CFC113) was a function of the initial CFC113 concentration. Typically, aqueous CFC113 concentrations up to 1 mg/L slowed, but did not stop PCE-degradation, but cis-1,2-dichloroethene (cDCE) degradation was inhibited by 0.2 mg/L CFC113. In some cultures, however, PCE degradation was stopped by as little as 0.15 mg/L CFC113. CFC113 also slowed the consumption of hydrogen and the concurrent methane production. CFC113 slowly degraded in PCE-enrichment cultures to hydrochlorofluorocarbon 123a (HCFC123a). Chlorotrifluoroethene was also detected. Although relatively non-toxic, CFC113 may nevertheless pose remediation challenges when present at sites that also contain PCE. |
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Keywords: | chlorofluorocarbon 113 tetrachloroethene anaerobic degradation inhibition |
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