Indexed by:期刊论文

Date of Publication:2018-05-15

Journal:BIOCHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:133

Page Number:106-112

ISSN No.:1369-703X

Key Words:Microbial fuel cell; Sequencing batch reactor; Acidification; Bi-direction electron transfer; Oxygen exposure

Abstract:A novel sequential polarity-inverting microbial fuel cell (MFC) is developed to neutralize anodic acidification and cathodic alkalinization and treat wastewater. The same electrode sequentially experiences anaerobic anode, aerobic cathode and anoxic cathode phases like a SBR (Sequencing Batch Reactor Activated Sludge process), and such two SBR half cells with opposite electrode polarities consist of a complete MFC. The system successfully buffers electrolyte and generates electricity with a maximum power density of 623 +/- 4 mW/m(3). Chemical oxygen demand is completely removed. Three bacteria, Arthrobacter sp., Stenotrophomonas sp. and Sphingobacterium sp., are found on the polarity-inverting electrode, and Arthrobacter sp. is believed to be capable of transferring electrons both to and from electrode. The proof-of-principle of a polarity-inverting MFC described here may offer an opportunity of integrating MFCs into the practical wastewater treating process. (C) 2018 Published by Elsevier B.V.