Electroplating wastewater treatment through chemical precipitation and electrodialysis

Peng, C.; Song, S.; Lu, S.; López-Valdivieso, A.
September 2004
European Journal of Mineral Processing & Environmental Protectio;2004, Vol. 4 Issue 3, p210
Academic Journal
In the present work, treatment of an electroplating wastewater in a high chromium concentration has been studied through chemical precipitation (CP) and electrodialysis (ED). It has been found that chemical precipitation or electrodialysis alone could not produce a qualified water to be recycled to electroplating lines as rinsing water. Accordingly, a novel process, combined chemical precipitation and electrodialysis (CP-ED), has been tested on the wastewater. The experimental results have shown that the CP-ED process greatly eliminated chromium from the wastewater, about 95% Cr (VI) removal, leaving the cleaned water assaying 0.18mg/l Cr(VI). Also, the CP-ED process effectively removed other ions such as Na+ and Cl- that were involved into the wastewater because of adding precipitants in the CP step. Compared with CP treatment, CP-ED process allowed a large saving at reagent cost and operation cost, and less environmental concerns.


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