Gansu Key Laboratory of Biomonitoring and Bioremediation for Environment Pollution, School of Life Science, Lanzhou University, 222 South Tianshui Rd, Lanzhou, Gansu, 730000, PR China.
Department of Occupational and Environmental Health, School of Public Health, Lanzhou University, Lanzhou, 730000, Gansu Province, PR China.
Environ Res. 2022 Mar;204(Pt B):112089. doi: 10.1016/j.envres.2021.112089. Epub 2021 Sep 24.
Lack of process control between the two stages of a combined microbial fuel cell-membrane bioreactor (MFC-MBR) system limits its application in wastewater treatment due to membrane fouling and high energy consumption. In this study, a two-stage MFC-MBR integrated system was established to investigate the impact of incorporating process control on petroleum refinery wastewater treatment. The results showed that chemical oxygen demand (COD) removal exhibits a linear relationship with the MFC voltage output (R = 0.9821); therefore, the MFC was used as a biosensor to control the combined system. The removal efficiencies of COD, ammonium nitrogen (NH-N), and total nitrogen (TN) were 96.3%, 92.4%, and 86.6%, respectively, in the MFC-MBR biosensor, whereas those in the control system were 74.7%, 71.2%, and 64.7% respectively. Furthermore，using the biosensor control system yielded a 50% reduction in the transmembrane pressure (1.01 kPa day) and decreased membrane fouling in wastewater treatment. The maximum energy recovery of the biosensor system (0.00258 kWh m) was five times higher than that of the control system, as determined by calculating the mass balance of the system. Thus, this study indicates that using the MFC as a biosensor for process control in an MFC-MBR system can improve overall system performance.
两段式微生物燃料电池-膜生物反应器（MFC-MBR）系统缺乏过程控制，由于膜污染和高能耗，限制了其在废水处理中的应用。本研究建立了两段式 MFC-MBR 集成系统，以考察在石油炼制废水中纳入过程控制对其处理的影响。结果表明，化学需氧量（COD）去除与 MFC 电压输出呈线性关系（R=0.9821）；因此，MFC 可用作生物传感器来控制组合系统。在 MFC-MBR 生物传感器中，COD、氨氮（NH-N）和总氮（TN）的去除效率分别为 96.3%、92.4%和 86.6%，而在对照系统中分别为 74.7%、71.2%和 64.7%。此外，生物传感器控制系统的跨膜压力（1.01kPa 天）降低了 50%，减少了废水处理中的膜污染。通过计算系统的质量平衡，生物传感器系统（0.00258kWh m）的最大能量回收率是对照系统的五倍。因此，本研究表明，在 MFC-MBR 系统中使用 MFC 作为生物传感器进行过程控制，可以提高整体系统性能。
