Enhanced Biotransformation of Trichloroethylene Under Mixed Electron Acceptor Conditions |
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Authors: | Ramaraj Boopathy Robert Peters |
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Institution: | (1) Department of Biological Sciences, Nicholls State University, Thibodaux, Louisiana 70310, USA, US;(2) Energy Systems Division, Building 362, Argonne National Laboratory, Argonne, Illinois 60439, USA, US |
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Abstract: | The biotransformation of trichloroethylene (TCE) under various electron acceptor conditions was investigated by using enrichment
cultures developed from the anaerobic digester sludge of Thibodaux sewage treatment plant. The results indicated that TCE
was biotransformed under sulfate reducing, methanogenic, nitrate reducing, iron reducing, and fermenting conditions. However,
the rates of TCE removal varied among the conditions studied. The fastest removal of TCE (100% removal in 9 days) was observed
under mixed electron acceptor conditions, followed in order by methanogenic, fermenting, iron reducing, sulfate reducing,
and nitrate reducing conditions. Under mixed electron acceptor conditions, the TCE was converted to ethene, which was further
metabolized. Under sulfate and nitrate reducing conditions, the major metabolites produced from TCE metabolism were cis and trans dichloroethylene (DCE). Under methanogenic, iron reducing, and fermenting conditions, cis and trans DCE and ethene were produced from TCE metabolism. This study showed evidence for TCE metabolism in a mixed microbial population
system similar to any contaminated field sites, where heterogeneous microbial population exists.
Received: 21 July 2000 / Accepted: 5 September 2000 |
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