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Development of a novel electrocoagulation membrane reactor with electrically conductive membranes as cathode to mitigate membrane fouling
Journal of Membrane Science ( IF 9.5 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.memsci.2020.118713
Li Li Xu , Lie Liu , Kun Peng Wang , Shi Yu Zhao , Qin Yi Liu , Yong Zhang , Jun Wang

Abstract This study developed a novel electrocoagulation membrane reactor (ECR-ECM), an integrated system embracing electrocoagulation and membrane filtration in one individual reactor, by applying electric field to the electrically conducting membranes. Some key operational conditions (e.g. current density, pH and applied voltage) were systematically investigated to determine the synergistic influence of coagulation and electric field on the reactor performance. It was found that ECR-ECM showed the lowest flux decline (20.8%) in comparison with EC-UF (27.6%) and UF alone (41.3%) after filtration, suggesting that ECR-ECM exhibited the optimal antifouling behaviour. The increase of pH from 4 to 10 played a positive effect on the fouling mitigation by improving the electrostatic repulsive force between negatively charged pollutants and membranes. Improvement of current density from 5 to 10 A/m2 facilitated the generation of aluminum coagulant as well as bubbles, and therefore promoted the aggregation of foulants and reduced membrane fouling. Increasing applied voltage from 0 to 2.5 V led to a stronger repulsion force which have an ability to prevent the negatively charged foulants from accumulating on the membrane surface. This generated a much looser fouling layer, leading to a decreased flux decline. Importantly, the increased porosity and reduced resistance of membrane fouling layer under applied voltage was further confirmed through the calculation using Kozeny-Carman equation. This study provides a simple and feasible strategy for the fabrication of a novel electrocoagulation membrane reactor which has potential in solving membrane fouling problems with a more compact design.

中文翻译:

以导电膜为阴极的新型电凝膜反应器的开发,以减轻膜污染

摘要 本研究开发了一种新型电凝膜反应器 (ECR-ECM),这是一种通过对导电膜施加电场,在一个单独的反应器中实现电凝和膜过滤的集成系统。系统地研究了一些关键的操作条件(例如电流密度、pH 值和施加的电压),以确定凝结和电场对反应器性能的协同影响。发现与过滤后的 EC-UF (27.6%) 和单独的 UF (41.3%) 相比,ECR-ECM 表现出最低的通量下降 (20.8%),表明 ECR-ECM 表现出最佳的防污性能。pH 从 4 增加到 10 通过提高带负电荷的污染物与膜之间的静电排斥力,对减少污染起到了积极的作用。电流密度从 5 A/m2 提高到 10 A/m2 有利于铝混凝剂和气泡的产生,从而促进污垢的聚集,减少膜污染。将施加的电压从 0 V 增加到 2.5 V 会导致更强的排斥力,从而能够防止带负电荷的污垢积聚在膜表面。这产生了更松散的污垢层,导致通量下降减少。重要的是,通过使用 Kozeny-Carman 方程的计算进一步证实了在施加电压下膜污染层的孔隙率增加和电阻降低。该研究为制造新型电凝膜反应器提供了一种简单可行的策略,该反应器具有以更紧凑的设计解决膜污染问题的潜力。
更新日期:2021-01-01
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