Great Lakes Regional Pollution Prevention Roundtable
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GLRPPR Sector Resource: Extending Sulfuric Acid Anodizing Bath Life

Extending Sulfuric Acid Anodizing Bath Life

The Waste Management and Research Center (WMRC) worked with All-Brite Anodizing, a small job shop anodizer located in Northlake, IL to achieve two goals. The first was to test the effectiveness of a commercial acid bath extender. The second was to determine if sulfuric acid used in the anodizing process could be cleansed sufficiently to continue using it without decanting portions to the wastewater pre-treatment system. Keeping the sulfuric acid anodizing baths clean at All-Brite Anodizing avoided dumping or partially decanting the baths for at least one year. The acid bath extender tested by All-Brite did not remove significantly more aluminum contaminants from the sulfuric acid anodizing bath than filtering alone using a 20-micron cartridge filter. It was also concluded that a sulfuric acid anodizing bath can withstand aluminum contaminant concentrations of 3.0 oz/gal (22.5 gm/L) if other impurities are filtered out of the bath. This level is 50% greater than previously reported. The acid filtration and recycling system costs about $1,000 and the system paid for itself in about nine months. (PDF Format; Length: 4 pages)


IL Waste Management & Research Center (WMRC)

Resource Type:
Case study/success story

Date of Publication:
May 2007

Associated Sectors:

GLRPPR is a member of the Pollution Prevention Resource Exchange, a national network of regional information centers: NEWMOA (Northeast), WRRC (Southeast), GLRPPR (Great Lakes), ZeroWasteNet (Southwest), P2RIC (Plains), Peaks to Prairies (Mountain), WSPPN (Pacific Southwest), PPRC (Northwest).


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