Accelerated microbial reductive dechlorination of 2,4,6-trichlorophenol by weak electrical stimulation

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 中国科学院环境生物技术重点实验室

	Accelerated microbial reductive dechlorination of 2,4,6-trichlorophenol by weak electrical stimulation
	Lin, Xiao-Qiu ; Li, Zhi-Ling ; Liang, Bin ; Zhai, Hong-Liang ; Cai, Wei-Wei ; Nan, Jun ; Wang, Ai-Jie
刊名	WATER RESEARCH
	2019-10-01
卷号	162 页码:236-245
关键词	2,4,6-Trichlorophenol Reductive dechlorination Electrical stimulation Electro-active microorganism Biocathode Microbial interaction
ISSN号	0043-1354
英文摘要	Microbial reductive dechlorination of chlorinated aromatics frequently suffers from the long dechlorination period and the generation of toxic metabolites. Biocathode bioelectrochemical systems were verified to be effective in the degradation of various refractory pollutants. However, the electrochemical and microbial related working mechanisms for bio-dechlorination by electro-stimulation remain poorly understood. In this study, we reported the significantly improved 2,4,6-trichlorophenol dechlorination activity through the weak electro-stimulation (cathode potential of -0.36 V vs. SHE), as evidenced by the 3.1 times higher dechlorination rate and the complete dechlorination ability with phenol as the end dechlorination product. The high reductive dechlorination rate (20.8 mu M/d) could be maintained by utilizing electrode as an effective electron donor (coulombic efficiency of 82.3 +/- 4.8%). Cyclic voltammetry analysis of the cathodic biofilm gave the direct evidences of the cathodic respiration with the improved and positive-shifted reduction peaks of 2,4,6-TCP, 2,4-DCP and 4-CP. The optimal 2,4,6-TCP reductive dechlorination rate (24.2 mu M/d) was obtained when a small amount of lactate (2 mM) was added, and the generation of H-2 and CH4 were accompanied due to the biological fermentation and methanogenesis. The electrical stimulation significantly altered the cathodic biofilm structure and composition with some potential dechlorinators (like Acetobacterium) predominated. The microbial interactions in the ecological network of cathodic biofilm were more simplified than the planktonic community. However, some potential dechlorinators (Acetobacterium, Desulfovibrio, etc.) shared more positive interactions. The co-existence and possible cooperative relationships between potential dechlorinators and fermenters (Sedimentibacter, etc.) were revealed. Meanwhile, the competitive interrelations between potential dechlorinators and methanogens (Methanomassiliicoccus) were found. In the network of plankton, the fermenters and methanogens possessed the more positive interrelations. Electro-stimulation at the cathodic potential of -0.36 V selectively enhanced the dechlorination function, while it showed little influence on either fermentation or methanogenesis process. The study gave suggestions for the enhanced bioremediation of chlorinated aromatics, in views of the electrostimulation capacity, efficiency and microbial interrelations related microbial mechanism. (C) 2019 Elsevier Ltd. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43326]
专题	生态环境研究中心_中国科学院环境生物技术重点实验室
作者单位	1.Harbin Inst Technol, Sch Environm, State Key Lab Urban Water Resources & Environm, Harbin 150090, Heilongjiang, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Environm Biotechnol, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Lin, Xiao-Qiu,Li, Zhi-Ling,Liang, Bin,et al. Accelerated microbial reductive dechlorination of 2,4,6-trichlorophenol by weak electrical stimulation[J]. WATER RESEARCH,2019,162:236-245.
APA	Lin, Xiao-Qiu.,Li, Zhi-Ling.,Liang, Bin.,Zhai, Hong-Liang.,Cai, Wei-Wei.,...&Wang, Ai-Jie.(2019).Accelerated microbial reductive dechlorination of 2,4,6-trichlorophenol by weak electrical stimulation.WATER RESEARCH,162,236-245.
MLA	Lin, Xiao-Qiu,et al."Accelerated microbial reductive dechlorination of 2,4,6-trichlorophenol by weak electrical stimulation".WATER RESEARCH 162(2019):236-245.