hexachlorobenzene dechlorination by indigenous sediment microorganisms

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Title:	hexachlorobenzene dechlorination by indigenous sediment microorganisms
Authors:	I-Ming Chen Wanit Wanitchapichat Teeranuch Jirakittayakorn Sukanda Sanohniti Wichidtra Sudjarid Chalermraj Wantawin Jarurat Voranisarakul Jin Anotai
Contributors:	環境資源管理系
Keywords:	Bioremediation Chlorobenzene Dechlorination Methanogen Sulfate-reducing bacteria
Date:	2010-05
Issue Date:	2012-05-31 14:49:36 (UTC+8)
Abstract:	Indigenous microbes from the sediments, whether contaminated with hexachlorobenzene (HCB) or not, could dechlorinate HCB effectively without any acclimation and supplemental nourishment. Temperature seriously affected the HCB-dechlorination: within the measured 15–45 °C span, the optimum range was between 30 and 35 °C. Sulfate-reducing bacteria (SRB), denitrifiers, and acetogens might not be directly involved in the HCB dechlorination. However, the SRB retarded subsequent dechlorination of pentachlorobenzene to tetra- and trichlorobenzenes. Some vancomycin-resistant gram-positive bacteria and methanogens were most likely to be the HCB-dechlorinators. The dechlorination followed the Michaelis–Menten behavior with the k′m and KHCB between 0.45–0.73 mg L−1 day−1 and 3.2–17.2 mg L−1, respectively. These findings suggest a potential HCB treatment and cleanup for wastewater and contaminated site
Relation:	Journal of Hazardous Materials 177(1-3)：p.244-250
Appears in Collections:	[Dept. of Environmental Resources Management] Periodical Articles

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