Specificity of Microbial Activities in the Reductive Dechlorination of Chlorinated Benzenes
Abstract:Anaerobic mixed cultures collected from tropical sediment were found to possess the ability to dechlorinate pentachlorobenzene (QCB) and hexachlorobenzene (HCB) after a long-term acclimation in HCB. The primary product for HCB and QCB was 1,3,5-trichlorobenzene (1,3,5-TCB). During QCB dechlorination, 1,2,3,5-tetrachlorobenzene (1,2,3,5-TeCB) is accumulated as the intermediate, but during the HCB dechlorination, QCB and 1,2,3,5-TeCB are not found. When treated with chloramphenicol, the microorganisms precultured in HCB were found to dechlorinate HCB for only 1 day and dechlorinate QCB for several days. However, microorganisms precultured in QCB could not dechlorinate HCB at all. Results also indicate that HCB is not directly dechlorinated to 1,3,5-TCB by a single microbial activity but that various microbial systems are responsible for each step of dechlorination from HCB to 1,3,5-TCB.
Document Type: Research Article
Publication date: November 1, 2000
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