电渗析法浓缩低浓度含铜废水

Low concentration copper-containing wastewater treatment by electrodialysis concentration

对低浓度含铜废水(10～50 mg/L)进行了电渗析浓缩实验研究。实验在自制电渗析装置中进行,电渗析反应槽内置交替排列的阴、阳离子交换膜,从而将反应槽分隔成阴、阳极极室、清室和浓室。废水中的铜离子由于电场力的作用透过离子交换膜被富集浓缩。实验分别考察了直流电压、极板间距、通电时间等因素对铜离子去除效率和浓缩倍数的影响,并分析其原因。结果显示,温度20℃、电压8 V、pH=7,极板间距360 mm、通电时间1 h时,铜离子去除效率可达90.4%,浓缩倍数为3.5,清室铜离子浓度为1.44 mg/L。

This research conducted an experiment on low concentration copper-containing wastewater （10 mg/L to 50 mg/L） by electrodialysis concentration in an electrodialysis device. Anion and cation exchange membranes are alternately installed in the electrodialysis reactive tank,which divided the reactor into anodal chamber,cathodal chamber,dilute chamber and concentrated chamber. Driven by electric field force,the copper ions in the wastewater were concentrated before penetrating through the ion exchange membranes. The experiment investigated the influences of DC voltage,electrode spacing,power-on time and other factors on the copper ion removal efficiency and enrichment factor. The results were analyzed in details. The results showed that copper ion removal efficiency can be as high as 90.4%at 20 ℃,8 V,pH=7,360 mm of electrode spacing,1 h of power-on,,and the enrichment factor can be 3.5,and copper ion concentration in the dilute chamber can be as high as 1.44 mg/L.