Anti-fouling performance and mechanism of anthraquinone/polypyrrole composite modified membrane cathode in a novel MFC–aerobic MBR coupled system
Anti-fouling performance and mechanism of anthraquinone/polypyrrole composite modified membrane cathode in a novel MFC–aerobic MBR coupled system
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DOI：
10.1039/c5ra00735f
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发表时间：
2015-02
期刊：
影响因子：
3.9
通讯作者：
Lei Xu;Guoquan Zhang;Guang'en Yuan;Haiyan Liu;Jiadong Liu;Fenglin Yang
中科院分区：
文献类型：
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作者：
Lei Xu;Guoquan Zhang;Guang'en Yuan;Haiyan Liu;Jiadong Liu;Fenglin Yang
本研究以蒽醌-二磺酸/聚吡咯（AQDS/PPY）复合改性聚酯（PT）平板膜作为双室微生物燃料电池（MFC）的阴极，开发了一种好氧膜生物反应器（MBR），用于废水处理、能量回收和膜污染缓解。研究了AQDS/PPY/PT膜的各种理化特性参数，以确定其表面性能。在大部分运行时间内，MFC-MBR耦合系统的化学需氧量和NH4+ -N去除率平均分别为92.5%和70.6%。当水力停留时间为11.58 h，外阻为1000 Ω时，得到的最大功率密度为0.35 W m−3，电流密度为2.62 a m−3，膜污染缓解效果最佳，膜出水H2O2浓度最高，为2.1 mg L−1。有效的膜污染缓解主要归功于MFC的持续自生生物电，它不仅通过静电斥力加速带负电荷的污染物从膜表面反扩散，而且通过自持续非均相电- fenton过程在膜表面和/或膜孔内原位产生H2O2和甚至˙OH自由基，实现了膜的化学清洁。虽然MFC - mbr耦合系统的电回收率远低于其他高产MFC系统，但本研究为膜抗污染机理提供了新的认识，并将引起人们广泛的兴趣，探索更多高效的催化膜材料，以最大限度地提高功率输出，最大限度地减少膜污染。
In this study, an aerobic membrane bioreactor (MBR) equipped with anthraquinone–disulphonate/polypyrrole (AQDS/PPY) composite modified polyester (PT) flat membrane serving as the cathode of a dual-chamber microbial fuel cell (MFC) was developed for wastewater treatment, energy recovery and membrane fouling mitigation. Various physicochemical characteristic parameters were investigated to determine the surface properties of the AQDS/PPY/PT membrane. During most of the operation period, the chemical oxygen demand and NH4+–N removal efficiencies of this novel MFC–MBR coupled system averaged 92.5% and 70.6%, respectively. Over the hydraulic retention time of 11.58 h and the external resistance of 1000 Ω, a maximum power density of 0.35 W m−3 and a current density of 2.62 A m−3 were obtained, meanwhile, the membrane fouling mitigation achieved the best status the H2O2 concentration in membrane effluent also reached the highest value of 2.1 mg L−1. The effective membrane fouling mitigation was attributed mainly to the continuous self-generated bio-electricity of MFC, which not only accelerates the back-diffusion of negative charged foulants away from the membrane surface through the electrostatic repulsion, but also realizes membrane chemical cleaning through the in situ electrogenerated H2O2 and even ˙OH radicals on the membrane surface and/or inside the membrane pore from the self-sustainable heterogeneous electro-Fenton process. Though the electricity recovery of the MFC–MBR coupled system was much lower than other high-output MFC systems, this study provided a new insight into the membrane anti-fouling mechanism and will arouse extensive interests to explore more high-efficiency catalytic membrane materials to maximize power output and minimize membrane fouling.