Pollution Prevention and Control Technologies for Plating
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).
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