Anaerobic biotransformation of trichlorofluoroethene in groundwater microcosms

Citation
S. Vancheeswaran et al., Anaerobic biotransformation of trichlorofluoroethene in groundwater microcosms, ENV SCI TEC, 33(12), 1999, pp. 2040-2045
Citations number
27
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology,"Environmental Engineering & Energy
Journal title
ENVIRONMENTAL SCIENCE & TECHNOLOGY
ISSN journal
0013-936X → ACNP
Volume
33
Issue
12
Year of publication
1999
Pages
2040 - 2045
Database
ISI
SICI code
0013-936X(19990615)33:12<2040:ABOTIG>2.0.ZU;2-O
Abstract
The biological reduction of trichlorofluoroethene (TCFE) was investigated i n anaerobic groundwater microcosms. TCFE was reductively dehalogenated by m icroorganisms to produce three dichlorofluoroethene isomers, with cis-1,2-d ichlorofluoroethene (c-DCFE) being the main isomer formed. Further sequenti al 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 chlorinate d solvents, perchloroethene (PCE) and trichloroethene (TCE), when present a t 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 t ests (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 degradati on 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 environ ments.