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Pollution Prevention and Control Technologies for Plating Operations
Section 3 - Chemical Recovery
3.2 ATMOSPHERIC EVAPORATORS
3.2.8 Residuals Generation
Most shops using atmospheric evaporators did not report the generation of any residuals. Presumably, this is because most residuals that would form in the evaporator (e.g., carbonates) will, for the most part, gravity drain back to the process tank. Two shops that reported residuals from the evaporator were PS 089 and PS 113. PS 089 uses a home-made evaporator for chromium solution recovery and generates a "minimal" quantity of sludge. PS 089 generates 30 gal/mth of sludge from evaporative recovery of cadmium solution.
Several other shops listed the carbonates removed from their cyanide containing plating solutions as a residual generated by evaporation. Presumably, they feel that the evaporator created this waste product. The most significant quantity is generated by PS 183 (80 lbs/week).