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Pollution Prevention and Control Technologies for Plating Operations
Section 4 - Chemical Solution Maintenance
4.3 MICROFILTRATON
4.3.7 Residuals Generation
The application of microfiltration to degreaser/cleaner bath maintenance is intended to reduce the quantity of waste that is treated on-site and/or shipped off-site. The degreasing/cleaning bath is continuously maintained by removing oil and other contaminants that normally cause it to become spent. The tramp oil and other contaminants removed by skimming, settling and filtration will require off-site disposal. Depending on the volume of tramp oil generated, off-site recycling of this residual is possible.
The Users Survey did not provide any data on process residuals. In one case study, presented in the literature (see Section 4.3.3), maintenance of a 250 gallon degreasing bath with an oil loading of 100 g/hr generated approximately 300 gallons of 30 percent emulsion waste per year (based on an 80 hour work week) (ref. 311).