Department of Agricultural Engineering, Northwest A&F University, Yangling 712100, China.
Department of Agricultural Engineering, Northwest A&F University, Yangling 712100, China.
Bioelectrochemistry. 2019 Apr;126:12-19. doi: 10.1016/j.bioelechem.2018.11.006. Epub 2018 Nov 19.
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), 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.
微生物燃料电池 (MFC) 已被应用于降解由苹果树枝制成的木醋液 (PL)，并分析了不同浓度下的底物去除、电化学性能和微生物群落特征，以评估 MFC 的性能。当 MFC 以 1g 化学需氧量 (COD)/L 的最佳浓度进料时，可实现最大电流密度 (1.94 A/m)、库仑效率 (28%) 和苯酚去除率 (84%)。极化试验、循环伏安法和电极氧化还原反应的电化学阻抗进一步解释了在 1g COD/L 的最佳浓度下，PL 的添加如何刺激电化学活性生物膜的形成。阳极生物膜的微生物群落表明，以 1g COD/L 进料的 MFC 具有最高的典型产电菌 Geobacter（33%）相对丰度，其次是 Sphaerochaeta（6%）和 Clostridium（4%）。结果表明，这些功能微生物的共代谢相互作用对 PL 的降解和电流产生有重要贡献。
