School of Mechanical Engineering, Hefei University of Technology, Hefei, Anhui Province 230009, China E-mail:
School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, Anhui Province 230009, China.
Water Sci Technol. 2020 May;81(9):1972-1982. doi: 10.2166/wst.2020.251.
This study evaluated the effects of temporary external voltage on the performance of two-chambered microbial fuel cells (MFC) that use nitrate wastewater as a substrate. Results indicate that the external voltage affected the performance of the MFC during their operation, and this effect remained even after the voltage was removed. The degradation efficiency of the chemical oxygen demand increased in the MFC under external voltages of 0.5, 0.8, and 1.1 V, and the optimal applied voltage was 1.1 V. Compared with the control group without external voltages, the MFC under a voltage of 1.1 V achieved higher current densities and efficiency of nitrate removal during their operation. The MFC with an applied voltage of 1.1 V also achieved the highest maximum power density of 2,035.08 mW/m. The applied voltages of 0.5 and 0.8 V exerted a positive effect on the performance of the MFC. High-throughput sequencing was used to explore the anode and cathode biofilms. Results showed that the influence was highly associated with microbial community in bio-anode. The predominant functional family changed from Methanotrichaceae during start-up to Flavobacteriaceae in a steady phase.
本研究评估了临时外加电压对以硝酸盐废水为基质的双室微生物燃料电池（MFC）性能的影响。结果表明，外加电压在 MFC 的运行过程中对其性能产生了影响，即使在去除电压后，这种影响仍然存在。在 0.5、0.8 和 1.1 V 的外加电压下，MFC 的化学需氧量降解效率提高，最佳施加电压为 1.1 V。与没有外加电压的对照组相比，在 1.1 V 电压下运行的 MFC 具有更高的电流密度和硝酸盐去除效率。施加 1.1 V 电压的 MFC 还实现了最高的最大功率密度 2,035.08 mW/m。外加电压为 0.5 和 0.8 V 对 MFC 的性能产生了积极影响。高通量测序用于探索阳极和阴极生物膜。结果表明，这种影响与生物阳极中的微生物群落高度相关。在启动阶段，主要功能家族从甲烷营养菌科变为稳定期的黄杆菌科。
