The large amount of municipal wastewater discharged into urban rivers sometimes exceeds the rivers’ self-purification capacity leading to black-odorous polluted water. Electro-flocculation has emerged as a powerful remediation technology. Electro-flocculation in a bubble column tower with a bipolar electrode (BPE) was tested in an attempt to overcome the high resistance and weak gas-floatation observed with a monopolar electrode (MPE) in treating such water. The BPE reactor tested had a Ti/Ta₂O₅-IrO2 anode and a graphite cathode with an iron or aluminum bipolar electrode suspended between them. It was tested for its ability to reduce turbidity, phosphate and sulphion and to increase the concentration of dissolved oxygen. The inclusion of the bipolar electrode was found to distinctly improved the system’s conductivity. The system’s electro-flocculation and electrical floatation removed turbidity, phosphate and sulphion completely, and the dissolved oxygen level improved from 0.29 to 6.28 mg/L. An aluminum bipolar electrode performed better than an iron one. Changes in the structure of the microbial community confirmed a significant improvement in water quality.

排入城市河流的大量市政废水有时会超过河流的自净能力，从而产生黑色臭味的污水。电絮凝已经成为一种强大的补救技术。为了克服用单极电极（MPE）处理这种水时观察到的高电阻和弱气浮性，对带有双极电极（BPE）的鼓泡塔塔中的电絮凝进行了测试。测试的BPE反应器具有Ti / Ta ₂ O ₅-IrO2阳极和石墨阴极，其间悬挂着铁或铝双极电极。测试了其降低浊度，磷酸盐和硫化物以及增加溶解氧浓度的能力。发现包含双极电极可明显改善系统的电导率。该系统的电絮凝和电浮选功能完全消除了浊度，磷酸盐和硫磺，溶解氧水平从0.29 mg / L提高到了6.28 mg / L。铝双极电极的性能优于铁双极。微生物群落结构的变化证实了水质的显着改善。