title: Enhanced decolorization of azo dye in a small pilot-scale anaerobic baffled reactor coupled with biocatalyzed electrolysis system (ABR-BES): a design suitable for scaling-up.
abstract: A four-compartment anaerobic baffled reactor (ABR) incorporated with membrane-less biocatalyzed electrolysis system (BES) was tested for the treatment of azo dye (alizarin yellow R, AYR) wastewater (AYR, 200 mg L(-1); glucose, 1000 mg L(-1)). The ABR-BES was operated without and with external power supply to examine AYR reduction process and reductive intermediates with different external voltages (0.3, 0.5 and 0.7 V) and hydraulic retention times (HRT: 8, 6 and 4h). The decolorization efficiency in the ABR-BES (8h HRT, 0.5 V) was higher than that in ABR-BES without electrolysis, i.e. 95.1 ± 1.5% versus 86.9 ± 6.3%. Incorporation of BES with ABR accelerated the consumption of VFAs (mainly acetate) and attenuated biogas (methane) production. Higher power supply (0.7 V) enhanced AYR decolorization efficiency (96.4 ± 1.8%), VFAs removal, and current density (24.1 Am(-3) TCV). Shorter HRT increased volumetric AYR decolorization rates, but decreased AYR decolorization efficiency.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 202 Haihe, Harbin 150090, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Cui
authors.affiliation: The Architecture Design and Research Institute of Harbin Institute of Technology, No. 202 Haihe Road, Harbin 150090, PR China.
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Guo
authors.affiliation: Department of Civil and Environmental Engineering, University of Waterloo, 200 University Avenue West Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Hyung-Sool
authors.initials: HS
authors.lastname: Lee
authors.affiliation: Department of Civil & Environmental Engineering, Centre for Sustainable Development & Global Competitiveness, Stanford University, Stanford, CA 94305-4020, USA.
authors.forename: Wei-Min
authors.initials: WM
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 202 Haihe, Harbin 150090, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Liang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 202 Haihe, Harbin 150090, PR China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China. Electronic address: waj0578@hit.edu.cn.
authors.forename: Ai-Jie
authors.initials: AJ
authors.lastname: Wang
authors.affiliation: Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China. Electronic address: chenghaoyihit@126.com.
authors.forename: Hao-Yi
authors.initials: HY
authors.lastname: Cheng
mesh_terms: D000693:Anaerobiosis; D001391:Azo Compounds / Q000737:chemistry*; D055162:Biocatalysis; D019149:Bioreactors; D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D004572:Electrolysis / Q000295:instrumentation*; D010865:Pilot Projects
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents
keywords: ABR–BES (anaerobic baffled reactor–biocatalyzed electrolysis system); Alizarin yellow R (AYR); Azo dye wastewater treatment; Power supply; Scale-up