title: Anaerobic degradation of polychlorinated biphenyls (PCBs) and polychlorinated biphenyls ethers (PBDEs), and microbial community dynamics of electronic waste-contaminated soil.
abstract: Environmental contamination caused by electronic waste (e-waste) recycling is attracting increasing attention worldwide because of the threats posed to ecosystems and human safety. In the present study, we investigated the feasibility of in situ bioremediation of e-waste-contaminated soils. We found that, in the presence of lactate as an electron donor, higher halogenated congeners were converted to lower congeners via anaerobic halorespiration using ferrous ions in contaminated soil. The 16S rRNA gene sequences of terminal restriction fragments indicated that the three dominant strains were closely related to known dissimilatory iron-reducing bacteria (DIRB) and those able to perform dehalogenation upon respiration. The functional species performed the activities of ferrous oxidation to ferric ions and further ferrous reduction for dehalogenation. The present study links iron cycling to degradation of halogenated materials in natural e-waste-contaminated soil, and highlights the synergistic roles of soil bacteria and ferrous/ferric ion cycling in the dehalogenation of polychlorinated biphenyls (PCBs) and polybrominated biphenyl ethers (PBDEs).
authors.affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; Graduate University of Chinese Academy of Sciences, Beijing 100039, China.
authors.forename: Mengke
authors.initials: M
authors.lastname: Song
authors.affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China. Electronic address: clluo@gig.ac.cn.
authors.forename: Chunling
authors.initials: C
authors.lastname: Luo
authors.affiliation: Guangdong Institute of Eco-environmental and Soil Sciences, Guangzhou 510650, China.
authors.forename: Fangbai
authors.initials: F
authors.lastname: Li
authors.affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Longfei
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, UK.
authors.forename: Dayi
authors.initials: D
authors.lastname: Zhang
authors.affiliation: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
authors.forename: Gan
authors.initials: G
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D059029:Electronic Waste; D004784:Environmental Monitoring; D055768:Halogenated Diphenyl Ethers / Q000032:analysis* / Q000378:metabolism; D011078:Polychlorinated Biphenyls / Q000032:analysis* / Q000378:metabolism; D059027:Recycling; D012987:Soil; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism
chemical_list: D055768:Halogenated Diphenyl Ethers; D012987:Soil; D012989:Soil Pollutants; C021244:polychlorinated diphenyl ethers; D011078:Polychlorinated Biphenyls
keywords: Biodegradation; E-waste; Microbial community; PBDEs; PCBs