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Pollution Prevention and Control Technologies for Plating Operations
Section 4 - Chemical Solution Maintenance
4.5 ACID SORPTION
4.5.2 Development and Commercialization
This technology is not widely used by the plating industry and it is not well documented in most common electroplating references. Therefore, tracing its origin has been difficult. The Metals Handbook, Vol. 5 (1982) indicated that acid sorption "has recently seen extensive application in the metal finishing industry for acid recovery" (ref. 340). Examples of applications given in that reference include the purification of sulfuric, hydrochloric and nitric acids. The only manufacturer of acid sorption equipment identified during the Vendors Survey, Eco-Tec, commercialized their equipment (APUª) in 1977 (ref. 363). As of 1993, Eco-Tec has sold approximately 200 units. The APUª was originally manufactured for the recovery of sulfuric acid anodizing solutions. However, as early as 1978 the technology was also applied to the purification of nitric acid rack stripping (nickel) baths (ref. 363).
In addition to the metal finishing industry, acid sorption is applicable to other industries that use strong acids, including the primary metals manufacturing and metals forming industries.