Pollution Prevention and Control Technologies for Plating
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
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).
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