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RECYCLING NICKEL ELECTROPLATING RINSE WATERS BY LOW TEMPERATURE EVAPORATION AND REVERSE OSMOSIS
Citation:
Lindsey, T. C. AND P M. Randall*. RECYCLING NICKEL ELECTROPLATING RINSE WATERS BY LOW TEMPERATURE EVAPORATION AND REVERSE OSMOSIS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/160 (NTIS 93-218865), 1993.
Impact/Purpose:
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Description:
Low temperature evaporation and reverse osmosis systems were each evaluated (on a pilot scale) on their respective ability to process rinse water collected from a nickel electroplating operation. Each system offered advantages under specific operating conditions. The low temperature evaporation system was best suited to processing solutions with relatively high (greater than 4,000 to 5,000 mg/L) nickel concentrations. The reverse osmosis system was best adapted to conditions where the feed solution had a relatively low (less than 4,000 to 5,000 mg/ L) nickel concentration. In electroplating operations where relatively dilute rinse water solutions must be concentrated to levels acceptable for replacement in the plating bath, a combination of the two technologies might provide the best process alternative. Initially, the reverse osmosis system could be used to concentrate the feed solution. This could be followed by low temperature evaporation processing to concentrate the solution to levels acceptable for replacement in the plating bath.