Cheng Benai, Wang Jie, Liu Wenbin, Cui Zhao, Bi Fanghua, Jia Hui, Zhang Hongwei
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China E-mail:
School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
Water Sci Technol. 2017 Jul;76(3-4):653-661. doi: 10.2166/wst.2017.250.
Microbial fuel cells (MFC) and membrane bioreactors (MBR) are promising technologies for wastewater treatment. However, both of them have some drawbacks and application limitations. A cost-effective hybrid system (EMBR) integrating MFC with MBR was evaluated in terms of treatment performance and membrane fouling. In this paper, two electric field directions with a membrane module in the middle were applied to explore the mechanism of membrane fouling mitigation in EMBRs. In both configurations of EMBRs, microbial activity and degradation ability of activated sludge for chemical oxygen demand and NH-N removals could be enhanced compared with those for the controlled MBR. In addition, the irreversible resistance significantly decreased, especially in the EMBR(-) with a longer operation time. Furthermore, two critical factors, namely enhanced bioflocculation and electrophoresis forces, were compared based on key parameters (zeta potential, particle size distribution and extracellular polymeric substances). The electrophoresis forces made a greater contribution to fouling alleviation than that conducted by the enhanced bioflocculation. The results suggested that EMBR, as a promising wastewater treatment technology, improved effluent quality and reduced energy consumption.
微生物燃料电池（MFC）和膜生物反应器（MBR）是用于废水处理的很有前景的技术。然而，它们都存在一些缺点和应用局限性。对一种将MFC与MBR集成的具有成本效益的混合系统（EMBR）进行了处理性能和膜污染方面的评估。本文应用了两种电场方向，中间设置膜组件，以探究EMBR中膜污染减轻的机制。在EMBR的两种配置中，与对照MBR相比，活性污泥对化学需氧量和NH-N去除的微生物活性和降解能力均可得到提高。此外，不可逆阻力显著降低，尤其是在运行时间较长的EMBR（-）中。此外，基于关键参数（ζ电位、粒径分布和胞外聚合物）比较了两个关键因素，即增强的生物絮凝和电泳力。电泳力对减轻污染的贡献大于增强生物絮凝所产生的贡献。结果表明，EMBR作为一种很有前景的废水处理技术，改善了出水水质并降低了能耗。
