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文章研究建立了一套电渗析法深度处理铜冶炼废水的小试装置,以某铜冶炼厂废水处理站出水为原水,通过实验,确定了电渗析法的极限电流密度,研究了电压、进水流量、进水浓度等参数对电渗析深度处理工艺出水水质的影响,并通过对比测试不同的阻垢剂对自来水、电渗析进水、电渗析出水的阻垢率,探讨电渗析出水回用后的结垢问题。结果表明:该电渗析装置的极限电流为0.42 A,极限电流密度为1.3 mA/cm2;最佳操作电压为20 V,适宜的进水流量为20 L/h,进水浓度对淡水水质影响不大;采用浓水循环工艺,淡水产率可提高至约80%,浓室TDS超过15 000 mg/L,对浓水的后续处理处置创造了条件;各阻垢剂对电渗析出水的阻垢率为72.0%~76.9%,远大于对电渗析进水的阻垢率,也显著大于对常规自来水的阻垢率。
In this paper, a set of small-scale equipment for electrodialysis deep treatment of copper smelting wastewater was established. The effluent from a copper smelter wastewater treatment plant was used as raw water. Through experiments, the limit current density of electrodialysis was determined. The effects of voltage, Flow rate, influent concentration and other parameters on the quality of the electrodialysis effluent treatment process, and by comparing the different scale inhibitors on tap water, electrodialysis infiltration, electrodialysis effluent, the scale inhibition rate, to explore the electrodialysis effluent reuse The scale problem. The results show that the limit current of the electrodialysis unit is 0.42 A and the limit current density is 1.3 mA / cm2. The optimum operating voltage is 20 V and the suitable influent flow rate is 20 L / h. The influent concentration has no effect on the fresh water quality Large; the use of concentrated water cycle process, the freshwater yield can be increased to about 80%, TDS concentration chamber over 15 000 mg / L, the subsequent treatment of concentrated water to create the conditions for the scale inhibitor of electrodialysis effluent inhibition rate Is 72.0% ~ 76.9%, much larger than the scale inhibition rate of electrodialysis influent, but also significantly greater than the conventional tap water scale inhibition rate.