Abstract
The cupric chloride solution whih is discharged as wastewater after the etching process was treated by ion exchange membrane electrodialysis. This method not only reuses the water by desalination, which may or may not be connected with ion exchange, it also concentrates the cupric chloride and metal copper can be recovered by electrolysis or some other suitable method, making it a closed system. The results of practical operation show that the electrodialysis method is comparble with precipitation from the point of view of cost and efficiency. We demonstrated that the plant could be operated successfully without damage to the home-made ion exchange membrane and without electrodeposition of the metal copper on the cathode. Furthermore, the energy consumption was less than 3 kWh/t water. The cupric ion concentration of 2,000 mg/l in the wastewater was reduced to less than 1 mg/l at discharge.
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