Optimized matching modes of bioelectrochemical module and anaerobic sludge in the integrated system for azo dye treatment. (September 2015)

• Record Type: Journal Article
• Authors: Kong, Fanying; Wang, Aijie; Ren, Hong-Yu
• Is Part Of: Bioresource technology. Volume 192(2015)
• Page Start: 486
• Page End: 493
• Publication Date: 2015-09
• Subjects: Integrated system -- Bioelectrochemical system (BES) -- Anaerobic sludge reactor (ASR) -- Matching mode -- Decolorization; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2015.06.001
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Matching modes of BES and anaerobic sludge in integrated system were optimized. 1/4 cathode soaking in the sludge with spiral distributor in down-flow was the best. Current, EIS and pH clearly demonstrated the efficient electron/proton transfer. Down-flow mode favored the efficient use of cathode and improved decolorization. Spiral distributor may create a spiral flow channel across cathode–microbes–solution. 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.