A novel composite conductive microfiltration membrane and its anti-fouling performance with an external electric field in membrane bioreactors.
A novel composite conductive microfiltration membrane and its anti-fouling performance with an external electric field in membrane bioreactors.
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DOI：
10.1038/srep09268
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发表时间：
2015-03-18
影响因子：
4.6
通讯作者：
Wu Z
中科院分区：
文献类型：
--
作者：
Huang J;Wang Z;Zhang J;Zhang X;Ma J;Wu Z
膜污染仍然是膜生物反应器（MBR）在废水处理和回收中广泛应用的一个障碍。在此，我们报告了一种简单的方法，通过将不锈钢网引入聚合物微滤（MF）膜中来制备复合导电微滤（MF）膜，并通过施加外部电场来有效控制其污染。线性扫描伏安法和电化学阻抗谱分析表明该导电膜具有非常好的电化学性能。批量试验证明了其对牛血清白蛋白、海藻酸钠、腐殖酸和二氧化硅颗粒作为模型污垢物的过滤的抗污垢能力。在长期运行过程中，采用2 V/cm电场的导电膜在连续流式MBR处理废水中的结垢率也比对照测试降低了约50%。污染物与膜之间静电排斥力的增强、氧还原产生的 H2O2 进行原位清洁以及可溶性微生物产物和细胞外聚合物产量的减少有助于减轻该 MBR 中的污染。本研究的结果揭示了膜污染的控制策略，以实现 MBR 的可持续运行。
Membrane fouling remains an obstacle to wide-spread applications of membrane bioreactors (MBRs) for wastewater treatment and reclamation. Herein, we report a simple method to prepare a composite conductive microfiltration (MF) membrane by introducing a stainless steel mesh into a polymeric MF membrane and to effectively control its fouling by applying an external electric field. Linear sweep voltammetry and electrochemical impedance spectroscopy analyses showed that this conductive membrane had very good electrochemical properties. Batch tests demonstrated its anti-fouling ability in filtration of bovine serum albumin, sodium alginate, humic acid and silicon dioxide particles as model foulants. The fouling rate in continuous-flow MBRs treating wastewater was also decreased by about 50% for this conductive membrane with 2 V/cm electric field compared to the control test during long-term operation. The enhanced electrostatic repulsive force between foulants and membrane, in-situ cleaning by H2O2 generated from oxygen reduction, and decreased production of soluble microbial products and extracellular polymeric substances contributed to fouling mitigation in this MBR. The results of this study shed light on the control strategy of membrane fouling for achieving a sustainable operation of MBRs.