title: Degradation pathway and mechanism of Reactive Brilliant Red X-3B in electro-assisted microbial system under anaerobic condition.
abstract: The degradations of Reactive Brilliant Red X-3B (RBRX-3B) in an electric-assisted microbial system (EAMS), a microbial system (MS) and an electrochemical system (ECS) were compared. The degradation efficiency of RBRX-3B in EAMS (99.8%) was 10.8% higher than the sum in MS (61.9%) and ECS (27.1%) at 24h at the optimal voltage of 0.4V, indicating that there was a synergistic effect between the electrode reaction and the biodegradation. The RBRX-3B degradation in EAMS followed first-order kinetic model. The activation energy of RBRX-3B degradation in EAMS was calculated to be 60.53kJmol-1by the Arrhenius equation, showing that the degradation rate of RBRX-3B mainly depended on bio-chemical reaction. RBRX-3B was degraded to both low-strength toxic compounds and nontoxic compounds in EAMS and those intermediates were easier to be further degraded. The pathway of RBRX-3B degradation in EAMS was different from that in MS.
authors.affiliation: State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China. Electronic address: caozhanping2012@126.com.
authors.forename: Zhanping
authors.initials: Z
authors.lastname: Cao
authors.affiliation: State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China. Electronic address: stpt1234@126.com.
authors.forename: Jinghui
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China. Electronic address: jinglizhangczp@126.com.
authors.forename: Jingli
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China. Electronic address: zhanghw@tjpu.edu.cn.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism*; D055664:Electrochemical Techniques; D008401:Gas Chromatography-Mass Spectrometry; D009282:Naphthalenesulfonates / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D001391:Azo Compounds; D009282:Naphthalenesulfonates; C520101:Reactive brilliant red X-3B
keywords: Degradation efficiency; Degradation pathway; Electric-assisted microbial system (EAMS); Reactive Brilliant Red X-3B