| Reductive dechlorination of chlorinated ethene DNAPLs by a culture enriched from contaminated groundwater. | |
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MedLine Citation:
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PMID: 10099525 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A microbial culture enriched from a trichloroethene-contaminated groundwater aquifer reductively dechlorinated trichloroethene (TCE) and tetrachloroethene (PCE) to ethene. Initial PCE dechlorination rate studies indicated a first-order dependence with respect to substrate at low PCE concentrations, and a zero-order dependence at high concentrations. Studies of TCE and vinyl chloride (VC) dechlorination indicated a first-order dependence at all substrate concentrations. VC had little or no effect on the initial rate of TCE dechlorination. With subsaturating concentrations of chlorinated ethenes, nearly stoichiometric amounts of the toxic intermediate vinyl chloride accumulated prior to its dechlorination to ethene. In contrast, under saturating conditions, in which a dense, nonaqueous-phase liquid existed in equilibrium with the aqueous phase, the chlorinated ethene was dechlorinated to ethene, at a rapid rate, with the accumulation of relatively small amounts of chlorinated intermediates. |
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Authors:
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R B Nielsen; J D Keasling |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Biotechnology and bioengineering Volume: 62 ISSN: 0006-3592 ISO Abbreviation: Biotechnol. Bioeng. Publication Date: 1999 Jan |
Date Detail:
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Created Date: 1999-05-04 Completed Date: 1999-05-04 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7502021 Medline TA: Biotechnol Bioeng Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 160-5 Citation Subset: IM |
Copyright Information:
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Copyright 1999 John Wiley & Sons, Inc. |
Affiliation:
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Department of Chemical Engineering, University of California, Berkeley, California 94720-1462, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Biodegradation, Environmental Chemical Engineering Ethylenes / metabolism Kinetics Tetrachloroethylene / metabolism* Trichloroethylene / metabolism* Vinyl Chloride / metabolism Water Microbiology* Water Pollutants, Chemical / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Ethylenes; 0/Water Pollutants, Chemical; 127-18-4/Tetrachloroethylene; 74-85-1/ethylene; 75-01-4/Vinyl Chloride; 79-01-6/Trichloroethylene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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