Anaerobic biotransformation of trichlorofluoroethene in groundwater microcosms
- Oregon State Univ., Corvallis, OR (United States). Dept. of Civil, Construction, and Environmental Engineering
- North Carolina State Univ., Raleigh, NC (United States). Dept. of Microbiology
The biological reduction of trichlorofluoroethene (TCFE) was investigated in anaerobic groundwater microcosms. TCFE was reductively dehalogenated by microorganisms to produce three dichlorofluoroethene isomers, with cis-1,2-dichlorofluoroethene (c-DCFE) being the main isomer formed. Further sequential biological transformation of these compounds to mono-chlorofluoroethene isomers was incomplete and occurred at much slower rates. The rates of TCFE reduction were compared to the rates of reduction of two common chlorinated solvents, perchloroethene (PCE) and trichloroethene (TCE), when present at similar concentrations. Aqueous concentrations ranged from 7.0 to 14.0 mg/L for TCFE and from 7.5 to 15.0 mg/L for PCE and TCE. Similar rates of PCE and TCE transformation relative to TCFE were observed in single-compound tests (PCE, TCE, and TCFE in separate microcosms) and when the contaminants were present together as mixtures in the microcosms. The close similarities between the time course and kinetics of TCFE degradation and the degradation of both PCE and TCE, when present at comparable initial concentrations, suggest that TCFE could potentially be used as a benign reactive tracer to measure in-situ rates of PCE and TCE transformation in contaminated environments.
- OSTI ID:
- 6335472
- Journal Information:
- Environmental Science and Technology, Vol. 33:12; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BIODEGRADATION
CHLORINATED ALIPHATIC HYDROCARBONS
GROUND WATER
MICROCOSMS
REMEDIAL ACTION
CHEMICAL REACTIONS
DECOMPOSITION
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
WATER
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)