Document Detail

Reductive dechlorination of chlorinated ethene DNAPLs by a culture enriched from contaminated groundwater.
MedLine Citation:
PMID:  10099525     Owner:  NLM     Status:  MEDLINE    
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.
R B Nielsen; J D Keasling
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biotechnology and bioengineering     Volume:  62     ISSN:  0006-3592     ISO Abbreviation:  Biotechnol. Bioeng.     Publication Date:  1999 Jan 
Date Detail:
Created Date:  1999-05-04     Completed Date:  1999-05-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7502021     Medline TA:  Biotechnol Bioeng     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  160-5     Citation Subset:  IM    
Copyright Information:
Copyright 1999 John Wiley & Sons, Inc.
Department of Chemical Engineering, University of California, Berkeley, California 94720-1462, USA.
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MeSH Terms
Biodegradation, Environmental
Chemical Engineering
Ethylenes / metabolism
Tetrachloroethylene / metabolism*
Trichloroethylene / metabolism*
Vinyl Chloride / metabolism
Water Microbiology*
Water Pollutants, Chemical / metabolism*
Reg. No./Substance:
0/Ethylenes; 0/Water Pollutants, Chemical; 127-18-4/Tetrachloroethylene; 74-85-1/ethylene; 75-01-4/Vinyl Chloride; 79-01-6/Trichloroethylene

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