School of Energy and Environment, Southeast University, Nanjing 210096, China; State Key Laboratory of Environmental Medicine Engineering, Ministry of Education, Southeast University, Nanjing, Jiangsu 210096, China.
School of Energy and Environment, Southeast University, Nanjing 210096, China.
Bioelectrochemistry. 2021 Aug;140:107748. doi: 10.1016/j.bioelechem.2021.107748. Epub 2021 Jan 26.
Different biocathode electrode materials (graphite felt and carbon brush, GF and CB) and exchange membranes (proton exchange membrane and cation exchange membrane, PEM and CEM) were used in three microbial fuel cell (MFC) configurations operated for 300-days to investigate the power generation and the COD and N removal performance. Results showed no effect on the COD removal (all above 96%); however, the power generation (46.11 mW·h) and denitrification performance (68.0 ± 1.6%) of the MFC-B (GF + PEM) system were higher than those of the other systems (MFC-A: CB + PEM; MFC-C: CB + CEM) (P < 0.01), and the power generation and denitrification performance of all three systems decreased with time (P < 0.01). By analyzing the physicochemical properties of the exchange membrane and cathode electrode materials, the reasons that affect the power generation performance of the system were clarified. Furthermore, the increase in bioelectricity enhanced the electricity-related nitrification and denitrification reactions. The average 300-day unit denitrification cost of MFC-A was 4.2 and 6.3 times that of MFC-B and MFC-C, respectively. Comprehensive consideration of electricity generation, denitrification, and service life, combined with cost analysis and better selection of construction materials, provides a theoretical basis for the long-term stable operation and sustainable application of MFCs.
采用不同的生物阴极电极材料（石墨毡和碳刷，GF 和 CB）和交换膜（质子交换膜和阳离子交换膜，PEM 和 CEM），在三种微生物燃料电池（MFC）构型中运行 300 天，以研究发电和 COD 和 N 去除性能。结果表明，COD 去除率（均高于 96%）没有影响；然而，MFC-B（GF+PEM）系统的发电（46.11 mW·h）和脱氮性能（68.0±1.6%）高于其他系统（MFC-A：CB+PEM；MFC-C：CB+CEM）（P<0.01），并且所有三个系统的发电和脱氮性能随时间下降（P<0.01）。通过分析交换膜和阴极电极材料的物理化学性质，阐明了影响系统发电性能的原因。此外，生物电能的增加增强了与电有关的硝化和反硝化反应。MFC-A 的 300 天单位脱氮成本分别是 MFC-B 和 MFC-C 的 4.2 和 6.3 倍。综合考虑发电、脱氮和使用寿命，并结合成本分析和更好地选择建筑材料，为 MFC 的长期稳定运行和可持续应用提供了理论依据。
