State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China.
Sci Total Environ. 2024 Jan 10;907:167827. doi: 10.1016/j.scitotenv.2023.167827. Epub 2023 Oct 13.
The application of membrane bioreactor (MBR) in high salinity wastewater treatment was mainly hindered by membrane fouling. Microbial fuel cell (MFC)-MBR coupling system was established to alleviate membrane fouling and save energy. Reduced graphene oxide/polypyrrole ceramic membrane (rGO/PPy CM) with high conductivity and stability was innovatively placed in MFC-MBRs as both cathode and filter, with PPy CM, rGO/PPy CM and CM placed in other reactors. MFC-MBR (rGO/PPy) and MFC-MBR (PPy) achieved higher pollutant removal efficiencies (90.73 % and 90.45 % for TOC, 87.22 % and 86.56 % for NH-N, respectively) and superior anti-fouling performance (1.86 and 1.93 kPa/d for average membrane fouling rates) than both conventional MBRs (CMBRs). The stable voltage generation was around 287 and 242 mV, respectively. Through high throughput sequencing, electric field showed a positive correlation with the abundance and activity of most dominant phylum (Bacteroidetes, Chloroflexi, Actinobacteria, and Firmicutes) and functional genes (amoA, hao, narG, napA, nirK, norB, and nosZ), thereby improving pollutant removal efficiency. The higher conductivity of rGO/PPy CM resulted in enhanced electric field intensity, leading to superior performance of anti-fouling and pollutant removal. This study inventively explored the effects of conductive membrane property on electricity generation performance, microbial community, pollutant removal and membrane fouling, providing theoretical support for the selection of electrode materials in MFC-MBR.
膜生物反应器（MBR）在高盐废水处理中的应用主要受到膜污染的阻碍。微生物燃料电池（MFC）-MBR 耦合系统的建立缓解了膜污染并节约了能源。创新性地将具有高导电性和稳定性的还原氧化石墨烯/聚吡咯陶瓷膜（rGO/PPy CM）放置在 MFC-MBR 中作为阴极和过滤器，而将 PPy CM、rGO/PPy CM 和 CM 放置在其他反应器中。与传统的 MBR（CMBR）相比，MFC-MBR（rGO/PPy）和 MFC-MBR（PPy）实现了更高的污染物去除效率（TOC 分别为 90.73%和 90.45%，NH-N 分别为 87.22%和 86.56%）和优异的抗污染性能（平均膜污染率分别为 1.86 和 1.93 kPa/d）。稳定的电压产生分别约为 287 和 242 mV。通过高通量测序，电场与大多数优势门（拟杆菌门、绿弯菌门、放线菌门和厚壁菌门）和功能基因（amoA、hao、narG、napA、nirK、norB 和 nosZ）的丰度和活性呈正相关，从而提高了污染物去除效率。rGO/PPy CM 更高的电导率导致了电场强度的增强，从而实现了更优异的抗污染和污染物去除性能。本研究创新性地探讨了导电膜特性对发电性能、微生物群落、污染物去除和膜污染的影响，为 MFC-MBR 中电极材料的选择提供了理论支持。
