关键词:电去离子;选择性分离;重金属废水
Electrodeionization electroplating wastewater removal of the heavy metal ions
Abstract:This work is about the selective separation and removal of nickel and copper ions in simulative electroplating wastewater by using a bench-scale electrodeionization system. The key point is the effect of selective separation of nickel and copper ions.The considered factors include pH value of wastewater, initial concentration of metal ions, applied voltage, kind of ion exchange membrane and co-present Cr(Ⅵ). The results indicate that the optimized condition is as follows: the pH value is about 4.3, the initial concentration of ions is 20mg/L, the applied voltage is 30V, the membrane is half-homogeneous membrane and Cr(Ⅵ) is not present. This conclusion will be a valuable basis of reference for the further research.
Key words: electrodeionization (EDI);selective separation;heavy metal wastewater