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Pollution Prevention and Control Technologies for Plating Operations


Section 4 - Chemical Solution Maintenance

4.8 DIFFUSION DIALYSIS

4.8.2 Development and Commercialization

The development of diffusion dialysis as a practical recovery technology took place in the early 1980's in Japan. In 1984 a device for the recovery of nitric and hydrofluoric acids from a mixed acid waste was installed at the Kashima works of Nippon Stainless Steel Co. (ref. Graver file.) The first European commercial application of diffusion dialysis identified in the literature took place in Sweden in 1989. That system, which is applied to the regeneration of a stainless steel pickling acid (HF/HNO3), was still in operation in 1993. Only one U.S. application of the technology was identified during the project (caustic recovery from an aluminum etch bath at Caspian, Inc., San Diego, 1992). That system processes the etch solution from three milling tanks with a total solution volume of 72,000 gal. Three U.S. vendors of this technology were identified during the Vendors Survey (Kinetic Recovery Corporation, Baker Brothers and Graver Water Division of the Graver Company).


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