Pollutant Generation by Air Force Electroplating Processes
2006
Daley, Peter S.
A detailed study of the pollutants generated in Air Force electroplating was performed and pollution emission factors were recommended for a variety of electroplating operations. The largest single source of pollution in the plating operation was 'dragout', the material removed by parts when they are withdrawn from solution and rinsed. For chromium plating, aerosol generation at the plating solution surface was significant, amounting to 0.12 g/A.da. This number was independent of a wide variety of electroplating variables and is recommended as an emission factor in chromium electroplating. Aerosol generation was not important in nickel, cadmium, or silver plating processes. Cyanide emissions in cadmium plating were independent of workload and depended primarily on tank surface area. An emission factor of 10 g/sq m.da is recommended. Collateral studies of scrubber efficiency for scrubber collection of chromium aerosols, quantitation of the dragout problem, and potential savings through chromium overplate recovery are presented. Chromium is identified as the major pollution problem resulting from electroplating. Logic is presented that could lead to the exemption of Air Force electroplating operations from federal electroplating emission standards.
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