title: Simultaneous Cr(VI) removal and 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) biodegradation by Pseudomonas aeruginosa in liquid medium.
abstract: Simultaneous Cr(VI) removal and 2,2',4,4'-tetra brominated diphenyl ether (BDE-47) biodegradation by Pseudomonas aeruginosa in liquid medium were investigated in this study, with the goal of elucidating the interaction between concomitant pollutants Cr(VI) and BDE-47 during microbial remediation. The experimental results revealed that the degradation efficiency of 1 mg L(-1) BDE-47 by 60 mg L(-1) biomass achieved 51.3% within 7 d when 2 mg L(-1) Cr(VI) coexisted. The degradation efficiency was accelerated at low concentrations of Cr(VI) (≤5 mg L(-1)), but inhibited at higher levels (≥10 mg L(-1)). Cr(VI) of 2 mg L(-1) facilitated the secretion of rhamnolipid from the strain, altered cell surface hydrophobicity and cell membrane permeability, and promoted intracellular BDE-47 accumulation, thus improving BDE-47 biotransformation. In addition, the stimulation of intracellular enzyme synthesis by 2 mg L(-1) Cr(VI) contributed to more BDE-47 elimination in the cells. The achievement of BDE-47 biodegradation was coupled with cell growth, enzyme extraction, cell membrane permeability change, and ATPase activity increase. The study also indicated that the improvement of Cr(VI) removal in BDE-47/Cr(VI) co-contaminated condition was mostly due to the increasing synthesis of extracellular enzyme in the presence of low concentrations of BDE-47. The whole study demonstrated that P. aeruginosa was available for the removal of toxic Cr(VI) and degradation of BDE-47 simultaneously in the liquid.
authors.affiliation: Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China.
authors.forename: Shaoyu
authors.initials: S
authors.lastname: Tang
authors.affiliation: Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China. Electronic address: huayin@scut.edu.cn.
authors.forename: Hua
authors.initials: H
authors.lastname: Yin
authors.affiliation: Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China.
authors.forename: Su
authors.initials: S
authors.lastname: Zhou
authors.affiliation: College of Natural Resource and Environment, South China Agriculture University, Guangzhou, 510642, Guangdong, China.
authors.forename: Shuona
authors.initials: S
authors.lastname: Chen
authors.affiliation: Department of Chemistry, Jinan University, Guangzhou, 510632, Guangdong, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Peng
authors.affiliation: Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China.
authors.forename: Zehua
authors.initials: Z
authors.lastname: Liu
authors.affiliation: Key Laboratory of Ministry of Education on Pollution Control and Ecosystem Restoration in Industry Clusters, School of Environment and Energy, South China University of Technology, Guangzhou, 510006, Guangdong, China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Dang
mesh_terms: D001673:Biodegradation, Environmental; D002857:Chromium / Q000378:metabolism*; D003470:Culture Media / Q000378:metabolism*; D055768:Halogenated Diphenyl Ethers / Q000378:metabolism*; D011075:Polybrominated Biphenyls / Q000378:metabolism; D011550:Pseudomonas aeruginosa / Q000378:metabolism*
chemical_list: D003470:Culture Media; D055768:Halogenated Diphenyl Ethers; D011075:Polybrominated Biphenyls; C511295:2,2',4,4'-tetrabromodiphenyl ether; D002857:Chromium; C074702:chromium hexavalent ion
keywords: Cell characteristics; Co-contamination; Cr(VI) removal; Polybrominated diphenyl ethers; Pseudomonas aeruginosa; Surfactant rhamnolipid