title: Complete debromination of decabromodiphenyl ether using the integration of Dehalococcoides sp. strain CBDB1 and zero-valent iron.
abstract: This study investigated the effects of nano- and micro-scale zero-valent iron (nZVI and mZVI) particles on Dehalococcoides sp. strain CBDB1 participating in anaerobic reduction of polybrominated diphenyl ethers. nZVI (>0.25 g L(-)(1)) had an inhibitory effect upon this strain, whereas 1.0 g L(-1) mZVI showed no negative impact on bacterial growth. Strain CBDB1 could only utilize lower brominated congeners (<7 bromines) as electron acceptor. In the bio-ZVI system, decabromodiphenyl ether (BDE-209) was first reduced by ZVI to lower brominated congeners, which were then dehalogenated to diphenyl ether by CBDB1. Within 30 d, a BDE-209 debromination efficiency of 16% and 24% was obtained in the bio-nZVI (0.25 g L(-1)) and bio-mZVI (1.0 g L(-1)) systems with a corresponding diphenyl ether yield efficiency of 14% and 19%, respectively. The debromination efficiency increased significantly from 8% to 24% with an increase of mZVI dosage from 0.25 to 1.0 g L(-1) in the bio-mZVI system.
authors.affiliation: College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400067, China. Electronic address: ilvy06@163.com.
authors.forename: Guiying
authors.initials: G
authors.lastname: Xu
authors.affiliation: School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Jiangbo
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Jingdezhen Ceramic Insitute, Jingdezhen 333403, Jiangxi Province, China.
authors.forename: Mang
authors.initials: M
authors.lastname: Lu
mesh_terms: D001966:Bromine / Q000378:metabolism*; D041862:Chloroflexi / Q000378:metabolism*; D004785:Environmental Pollutants / Q000378:metabolism*; D005411:Flame Retardants / Q000378:metabolism*; D055768:Halogenated Diphenyl Ethers / Q000378:metabolism*; D054879:Halogenation; D007501:Iron / Q000737:chemistry* / Q000378:metabolism*; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D005411:Flame Retardants; D055768:Halogenated Diphenyl Ethers; D007501:Iron; C010902:decabromobiphenyl ether; D001966:Bromine
keywords: BDE-209; Debromination; H(2) evolution; Toxicity