Dechlorination of Polychlorinated Biphenyl Congeners by Anaerobic Microorganisms From River Sediment

Author: Chang Bea-Ven   Chiu Tzu-Chuan   Yuan Shaw-Ying  

Publisher: Water Environment Federation

ISSN: 1061-4303

Source: Water Environment Research, Vol.78, Iss.7, 2006-07, pp. : 764-769

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Abstract

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.

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