Journal
BIORESOURCE TECHNOLOGY
Volume 163, Issue -, Pages 254-261Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.03.165
Keywords
ABR-BES (anaerobic baffled reactor-biocatalyzed electrolysis system); Scale-up; Azo dye wastewater treatment; Power supply; Alizarin yellow R (AYR)
Funding
- National Natural Science Foundation of China (NSFC) [51078100, 31370157]
- National Science Foundation for Distinguished Young Scholars [51225802]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51121062]
- National High-tech R&D Program of China (863 Program) [2011AA060904]
- Ph.D. Programs Foundation of Ministry of Education of China [20102302110055]
- Hundred Talents Program of the Chinese Academy of Sciences
- State Key Laboratory of Urban Water Resource and Environment. HIT [2013DX02]
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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 4 h). The decolorization efficiency in the ABR-BES (8 h 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 A m(-3) TCV). Shorter HRT increased volumetric AYR decolorization rates, but decreased AYR decolorization efficiency. (C) 2014 Elsevier Ltd. All rights reserved.
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