Evaluation of Reverse Osmosis Membranes for Treatment of Electroplating Rinsewater

摘要

Because of the limited pH range over which current commercially available reverse osmosis membranes can be applied, a test program was initiated to define the applicability of new membrane materials to the treatment of rinsewaters with extreme pH levels and high oxidant levels (chromic acid). Life tests were conducted with the PA-300, PBIL, NS-100, NS-200, SPPO, B-9, and CA membranes on rinsewaters from copper cyanide, zinc cyanide, acid copper, and chromic acid plating baths. The PA-300 membrane exhibited superior performance for the treatment of copper cyanide, zinc cyanide, and chromic acid rinsewaters, and further development and demonstration of this membrane is recommended.