Abstract

The design of electrodes is crucial to electrocoagulation process (EC), specifically, with respect to pollutant removal and energy consumption. During EC, the mechanisms for interaction between different electrode arrangement and electrode reactions remain unclear. This work presents an integrated EC process based on horizontal bipolar electrodes (BPEs). In the electrochemical cell, the graphite plates are used as driving cathode while either Fe or Al plates serves as driving anode and BPEs. The BPEs are placed horizontally between the driving electrodes. For municipal wastewater treatment, the pollutant removal efficiency and energy consumption in different configurations of two-dimension electrocoagulation (2D-EC) system with horizontal BPEs were investigated. The removal efficiency of turbidity, total phosphorus and total organic carbon increased significantly with the number of BPEs. Noted that the energy consumption for TP removal decreased by 75.2% with Fe driving anode and 81.5% with Al driving anode than those of 2D-EC, respectively. In addition, the physical field simulation suggested the distributions of potential and current in electrolyte and that of induced charge density on BPE surface. This work provides a visual theoretical guidance to predict the distribution of reactions on BPEs for enhanced pollutant removal and energy saving based on electrocoagulation process for municipal wastewater treatment.

中文翻译：

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基于水平双极电极的电凝工艺处理城市污水的性能及机理研究

摘要

电极的设计对于电凝过程（EC）至关重要，特别是在污染物去除和能耗方面。在EC期间，不同电极布置和电极反应之间相互作用的机制仍然不清楚。这项工作提出了基于水平双极电极（BPE）的集成EC工艺。在电化学电池中，石墨板用作驱动阴极，而铁或铝板则用作驱动阳极和BPE。BPE水平放置在驱动电极之间。对于市政废水处理，研究了采用水平BPE的二维电凝（2D-EC）系统在不同配置下的污染物去除效率和能耗。浊度的去除效率，总磷和总有机碳随BPE数量的增加而显着增加。注意，与2D-EC相比，铁驱动阳极和铝驱动阳极去除TP的能耗分别降低了75.2％和81.5％。此外，物理场模拟显示了电解质中电势和电流的分布以及BPE表面感应电荷密度的分布。这项工作提供了可视化的理论指导，以预测BPEs的反应分布，以基于电凝工艺处理市政废水的方法来增强污染物去除和节能效果。物理场模拟表明了电解质中电势和电流的分布以及BPE表面感应电荷密度的分布。这项工作提供了可视化的理论指导，以预测BPE的反应分布，以基于电凝工艺处理市政废水的方法来增强污染物去除和节能效果。物理场模拟表明了电解质中电势和电流的分布以及BPE表面感应电荷密度的分布。这项工作提供了可视化的理论指导，以预测BPE的反应分布，以基于电凝工艺处理市政废水的方法来增强污染物去除和节能效果。