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Pollution Prevention and Control Technologies for Plating Operations
Section 4 - Chemical Solution Maintenance
4.5 ACID SORPTION
4.5.6 Performance Experience
Only three shops (PS 020, PS 037, and PS 167) completed evaluations of this technology (a total of five users were identified). A partial summary of the users data relative to acid sorption is presented in Exhibit 4-19. There are a number of observations that can be made from these data and the literature:
- All of the shops providing detailed data use the technology for sulfuric acid purification (two-sulfuric acid anodize, one-hard anodize). These three shops gave the vendor and technology high grades in terms of technical support and overall satisfaction. All three companies indicated that the technology satisfied the need for which it was purchased. The following is a breakdown of the reasons why the three shops purchased the technology:
To meet or help meet effluent regulations: 2 To reduce plating chemical purchases: 2 To reduce the quantity of waste shipped off-site: 2 To reduce wastewater treatment costs: 1 To improve product quantity: 3 To meet customer specification: 1
- The respondents indicated that use of acid sorption for bath purification improved product quality and in one case, improved the production rate. The following responses were provided:
Product Quality Production Rate Improved 3 1 No Change 0 0 Decreased 0 0
- Although all three shops indicated that they were satisfied with the technical support provided by the manufacturer, one shop indicated that they would use a different vendor in the future.
- The literature was also reviewed for performance experience. The only articles that were located were written by employees of the manufacturer (Eco-Tec). These include several case studies covering nitric/hydrofluoric acid and sulfuric acid pickling (ref. 364 and 365), sulfuric acid anodizing (ref. 364 and 366) and nitric acid nickel strip (ref. 363).