靛蓝废水电絮凝体系的阴极损耗与效果研究

Study on Cathodic Loss and Effect of Indigo Dyeing Wastewater Electrocoagulation System

为探究靛蓝染色废水电絮凝体系中阴极损耗与效果的关系,文中以铝、石墨和碳纤维织物作为阴极,铝作为阳极,考察体系电流、废水色度、p H值、COD去除率和絮凝物质量,并分析体系中还原态物质浓度变化。结果表明,铝阴极和碳材料阴极重复使用3次电极损失率分别为2.3%和0,阴极损失将降低电极效率,导致电絮凝效果变差;碳纤维织物作为电絮凝阴极材料处理靛蓝染色废水,重复使用3次无电极损耗,处理后废水色度可降至54,COD去除率达96.92%,污泥产量少,是较为理想的电絮凝阴极材料。

In order to explore the relationship between the cathodic loss and effect of indigo dyeing wastewater electrocoagulation system,aluminum,graphite and carbon fiber fabric are used as the cathode with aluminum as the anode.The system current,chromaticity,pH,COD removal rate,floc mass and the concentration changes of the reduced substances in the system are analyzed.The results show that the electrode loss rates of aluminum cathode and carbon material cathode are 2.3%and 0 after repeated use for 3 times.The cathode loss reduces the electrode efficiency,resulting in poor electrocoagulation effect.Carbon fiber fabric used as an electrocoagulation cathode,there is no electrode loss after repeated use for 3 times.In addition,the chromaticity could be reduced to54,the COD removal rate is 96.92%,and the sludge output is only 1.895 g,which reveales that the carbon fiber fabric is an ideal electrocoagulation cathode material.