Journal
BIOELECTROCHEMISTRY
Volume 126, Issue -, Pages 12-19Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2018.11.006
Keywords
Pyroligneous liquor; Microbial fuel cell; Bioelectricity; Electrochemical performance; Microbial community analysis
Funding
- Shaanxi Province Basic Research Projects in Natural Sciences [2018JQ5082]
- China Postdoctoral Science Foundation [2017M61325]
- Fundamental Research Funds for the Central Universities [2452017129]
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Microbial fuels cells (MFCs) have been applied for the degradation of pyroligneous liquor (PL) derived from apple tree branches, at different concentrations. The substrate removal, electrochemical properties, and microbial community characteristics were analysed to evaluate the performance of MFCs. Maximum current density (1.94 A/m(2)), coulombic efficiency (28%), and phenol removal rate (84%) were achieved with MFCs fed with PL at the optimal concentration of 1 g chemical oxygen demand (COD)/L. The polarisation test, cyclic voltammetry, and electrochemical impedance of the electrode redox reaction further explained how the addition of PL could stimulate formation of the electrochemically active biofilm, at the optimal concentration of 1 g COD/L. The microbial community of the anodic biofilm demonstrated that MFCs fed with 1 g COD/L had the highest relative abundance of the typical electrogenic bacteria Geobacter (33%), followed by Sphaerochaeta (6%) and Clostridium (4%). The results revealed that syntrophic interaction of these functional microorganisms contributed significantly to the PL degradation and electrical current generation. (C) 2018 Elsevier B.V. All rights reserved.
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