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    188宝金博页面版: Microbial dehalogenation of trichlorophenol by a bacterial consortium characterization and mechanism

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    内容提示： Vol. 46 No. 2 SCIENCE IN CHINA (Series B) April 2003 Microbial dehalogenation of trichlorophenol by a bacterial consortium: characterization and mechanism WANG Jianlong (王建龙)1,2 & Werner Hegemann3 1. Laboratory of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, China; 2. State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University , Beijing 100084, China; 3. Technische Universitaet Berlin, Institut fuer Technisch...

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    Vol. 46 No. 2 SCIENCE IN CHINA (Series B) April 2003 Microbial dehalogenation of trichlorophenol by a bacterial consortium: characterization and mechanism WANG Jianlong (王建龙)1,2 & Werner Hegemann3 1. Laboratory of Environmental Technology, Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, China; 2. State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University , Beijing 100084, China; 3. Technische Universitaet Berlin, Institut fuer Technische Umweltschutz, Sekr KF 7, Strasse des 17, Juni 135, D-16023, Berlin, Germany Correspondence should be addressed to Wang Jianlong (email: wangjl@tsinghua.edu.cn) Received November 18, 2002 Abstract Chlorinated phenolic compounds are a class of toxic and refractory organic pollutants. The pollution caused by chlorophenols poses serious ecological and environmental problems. A stable bacterial consortium capable of reductively dechlorinating trichlorophenol was isolated using chlorophenol as the sole source of carbon and energy. The physiological characteristics of the mixed cultures were studied and the results show that the consortium could use pyruvate as the carbon and energy source. The fermentation of pyruvate, sulfate reduction and dechlorination process proceeded strictly in succession within this consortium. The effect of specific inhibitors on the dechlorinating activity of the consortium was investigated, and the results indicate that sulfate and molybdate (1 mmol/L) have a strong inhibitive influence on the dechlorination activity. Fluo-rescence in situ hybridization (FISH) technique was applied to analyzing the composition of the consortium and the results reveal that one major subpopulation within the consortium was phy-logenetically affiliated to gamma and delta subclass of Proteobacteria. Keywords: chlorophenol, biodegradation, sulfate-reducing bacteria, methanogenic bacteria, specific inhibitor, persistent organic pollutants. Chlorinated aromatic compounds are a class of widely used, toxic and refractory organic pollutants. Most of them are persistent organic pollutants (POPs). Chlorinated phenols are an im-portant subclass of them. Chlorinated phenolic compounds are generated from a number of indus-trial manufacturing processes. They comprise the bulk of the environmental pollutants. Aqueous effluents from many industrial operations, such as polymeric resin production, oil refining, iron-steel, petroleum, pesticide, paint, solvent, pharmaceutics, wood preserving chemicals, coke-oven and paper and pulp industries, contain chlorophenolic compounds. Due to their high toxicity, recalcitrance, bioaccumulation, strong odor emission and persistence in environment and suspected carcinogen and mutagen to the living, chlorophenols pose serious ecological problems as the environmental pollutants. Their fate in the environment is of great importance. Chlorophe-nols have been listed as the priority pollutants by the China National Environmental Monitoring Centre and U.S. Environmental Protection Agency[1].

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