摘要
电去离子法(EDI)是电渗析和离子交换的结合技术。在电渗析淡室中添加离子交换树脂作为阳极室介质,自制了EDI装置,并采用该装置对电镀铬漂洗废水进行处理,研究了进水pH、流量和电流密度对EDI分离效率的影响。结果发现,当进水pH=4.8,流量和电流密度分别为4L/h和1.2mA/cm2时,Cr(VI)的分离效率可达99.5%,但淡室出水中的Cr(VI)浓度略高于国家排放标准。作为一种能够高效分离电镀铬漂洗废水中六价铬的新技术,EDI仍有一些问题需要解决。
The electrodeionization （EDI） is a technology combining electrodialysis and ion exchange. An EDI device was made by adding ion-exchange resin to the dilution compartment of an electrodialysis apparatus as a medium of anodic compartment, and then used to treat rinsing wastewater from chrome plating. The influence of influent pH, flow rate, and current density on separation efficiency by EDI was studied. It was found that the separation efficiency of Cr（VI） reaches 99.5% at current density 1.2 mA/cm2, influent pH 4.8, and flow rate 4 L/h. However, the concentration of Cr（VI） in effluent from dilution chamber is slightly higher than that of the Chinese emission standard. EDI is a novel high-efficient technology for separation of hexavalent chromium in rinsing wastewater discharged from chrome plating process, but there are some problems remained to be solved.
出处
《电镀与涂饰》
CAS
CSCD
北大核心
2012年第10期45-47,共3页
Electroplating & Finishing
基金
广东省省部产学研合作引导项目(2010B090400223)
关键词
电镀
六价铬
废水处理
电去离子法
electroplating
hexavalent chromium
wastewatertreatment
electrodeionization
