title: Optimized matching modes of bioelectrochemical module and anaerobic sludge in the integrated system for azo dye treatment.
abstract: In this work, three matching modes (relative positions, catholyte flow sequences, and flow regimes) of bioelectrochemical module and anaerobic sludge were evaluated and optimized for azo dye treatment in the integrated system with embedding modular bioelectrochemical system into anaerobic sludge reactor. Results showed that it was favorable to operate this integrated system under the condition of 1/4 cathode soaking into sludge with spiral distributor in down-flow direction. Current, electrochemical impedance spectroscopy and pH clearly demonstrated the important role of 1/4 soaking in electron/proton transfer. The down-flow direction flowed through electrode zone and then sludge zone could benefit to the efficient use of cathode and improve AO7 treatment. Furthermore, the positive effect of spiral catholyte distributor might be due to its promoting role in mixing and creating a spiral flow channel around the cathode electrode-microbes-solution interface. These results exhibited great potential for matching modular bioelectrochemical system with anaerobic treatment process.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: fanyingkong@163.com.
authors.forename: Fanying
authors.initials: F
authors.lastname: Kong
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China; Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: waj0578@163.com.
authors.forename: Aijie
authors.initials: A
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. Electronic address: rhongyu@126.com.
authors.forename: Hong-Yu
authors.initials: HY
authors.lastname: Ren
mesh_terms: D001391:Azo Compounds / Q000302:isolation & purification / Q000378:metabolism*; D001421:Bacteria, Anaerobic / Q000378:metabolism* / Q000528:radiation effects; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D004563:Electrochemistry / Q000295:instrumentation*; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D011829:Radiation Dosage; D012722:Sewage / Q000382:microbiology*; D018511:Systems Integration; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000295:instrumentation
chemical_list: D001391:Azo Compounds; D012722:Sewage; D014874:Water Pollutants, Chemical
keywords: Anaerobic sludge reactor (ASR); Bioelectrochemical system (BES); Decolorization; Integrated system; Matching mode