title: [Microbial anaerobic dechlorination of polychlorinated biphenyls in paddy soil slurry].
abstract: We studied the dechlorination process of Aroclor1260, a high-chlorinated polychlorinated biphenyls (PCBs) mixture in an anaerobic paddy soil slurry, and further analyzed the related microbial community structures. The Aroclor1260 was reduced up to 55.5% in the natural paddy soil slurry in 128 days, and the reduction percentage dropped to 46.9% after incoculating the paddy soil slurry with a PCBs-dechlorination enrichment culture. The dechlorination mainly occurred in congeners of pentachlorobiphenyl, hexachlorobiphenyl, and specially, the heptachlorobiphenyl, with pentachlorobiphenyl accumulated as dechlorination intermediate. Hydrogen gas produced from fermentation of organic matters was maintained at a lower partial pressure due to its consumption during the dechlorination process, so that the methanogens was suppressed as well. The microbial community structure was significantly different between natural and inoculated paddy soils. Introducing the PCBs-dechlorination enrichment culture changed the local microbial community by the competition between the exogenetic dchlorinators and the indigenous bacteria, overall decreasing the dechlorination activity.
authors.forename: Kai
authors.initials: K
authors.lastname: Yang
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Yao
authors.forename: Chen
authors.initials: C
authors.lastname: Chen
authors.forename: Chao-feng
authors.initials: CF
authors.lastname: Shen
authors.forename: Zhi-hui
authors.initials: ZH
authors.lastname: Qin
authors.forename: Rong-lang
authors.initials: RL
authors.lastname: Huang
mesh_terms: D001140:Aroclors / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D054879:Halogenation; D012275:Oryza; D011078:Polychlorinated Biphenyls / Q000378:metabolism*; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*
chemical_list: D001140:Aroclors; D012987:Soil; D012989:Soil Pollutants; C026987:aroclor 1260; D011078:Polychlorinated Biphenyls