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Dechlorination of Polychlorinated Biphenyl Congeners by Anaerobic Microorganisms From River Sediment
Author(s) -
Chang BeaVen,
Chiu TzuChuan,
Yuan ShawYing
Publication year - 2006
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143006x107380
Subject(s) - environmental chemistry , congener , reductive dechlorination , chemistry , polychlorinated biphenyl , nitrate , methanogen , microorganism , chlorine , sulfate reducing bacteria , sulfate , biphenyl , denitrifying bacteria , biodegradation , biotransformation , anaerobic bacteria , bacteria , denitrification , methane , nitrogen , organic chemistry , biology , enzyme , genetics
The microbial dechlorination of seven kinds of polychlorinated biphenyls (PCBs) by anaerobic microorganisms from river sediment was investigated. Dechlorination rates were found to be affected by the chlorine level of PCB congeners; dechlorination rates decreased as chlorine levels increased. Dechlorination rates were fastest under methanogenic conditions and slowest under nitrate‐reducing conditions. The addition of individual electron donors (acetate, pyruvate, and lactate) enhanced the dechlorination of PCB congeners under methanogenic and sulfate‐reducing conditions but delayed the dechlorination of PCB congeners under nitrate‐reducing conditions. PCB congener dechlorination also was delayed by the addition of various polycyclic aromatic hydrocarbons (PAHs) under three reducing conditions and by surfactants, such as brij30, triton SN70, and triton N101. The results suggest that methanogen, sulfate‐reducing bacteria, and nitrate‐reducing bacteria all are involved in the dechlorination of PCB congeners.