Stimulated microbial reductive dechlorination of 2,4,6-trichlorophenol with an electrode serving as an available electron donor

摘要：

　　Bioremediation of halogenated aromatic compounds through microbial reductive dehalogenation is regarded as promising.And yet,the dehalogenation populations frequently suffer from the slow metabolic rate and limited dehalogenation ability.Here,an electrode posing at the constant negative potential was introduced into 2,4,6-TCP reductive dechlorination process,to testify the stimulated microbial metabolic activity and enhanced dechlorination capacity by serving as an additional electron donor besides lactate.In acclimated system with potential of-360 mV,2,4,6-TCP dechlorination rate improved to 24.9 μM/d,about 3.1 times higher than condition without cathodic potential,which was also one of the highest as reported previously in either constructed reactors or by isolates.By electrode stimulation,2,4,6-TCP could completely dechlorinated to phenol,which effectively avoided the generation of the more toxic metabolites,such as 4-CP,as opposed to condition without cathodic potential.The abundant of electro-active reductive dechlorinators,such as Clostridium,Nitratireductor and Desulfovibrio in cathodic biofim highlighted the involvement of cathodic electron transfer during reductive dechlorination,further evinced by electrochemical property analysis.Electron balance suggested both electrode and H2 generated from lactate fermentation were participated in electron donation during 2,4,6-TCP reductive dechlorination,and while,partial of electrons from electrode took part in other biochemical activities,such as methanogenesis.Current study offers insights to improve the dehalogenation efficiency during the remediation of halogenated aromatic compounds by supplying the slight current stimulation.

关键词： 2,4,6-Trichlorophenol Reductive dechlorination Stimulation Cathode Electron donor

作者: Xiao-Qiu Lin Zhi-Ling Li Jun Nan Bin Liang Arata Katayama Ai-Jie Wang

作者单位: State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbi Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chine EcoTopia Science Institute, Nagoya University, Chikusa, Nagoya 464-8603 Japan State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbi

会议类型: 国际会议

会议名称: The 15th IWA World Conference on Anaerobic Digestion( 第15届IWA世界厌氧大会)

会议地点: 北京

会议语种:英文

页码: 87-91

在线出版日期: 2017-10-17（万方平台首次上网日期，不代表论文的发表时间）