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EVALUATION OF ULTRA FILTRATION TO RECOVER AQUEOUS IRON PHOSPHATING/DEGREASING BATCH
Citation:
Miller, G., T. Lindsey, A. Ocker, M. Miller, AND P. Randall. EVALUATION OF ULTRA FILTRATION TO RECOVER AQUEOUS IRON PHOSPHATING/DEGREASING BATCH. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-93/144.
Description:
Pollution prevention efforts studied in the report summarized here targeted the hazardous waste generated from a 5000-gal iron phosphating/degreasing bath used by a metal fabricator to clean and precondition steel parts for painting. his project was carried out in four stages: (1) initial assessment of the problem and evaluation of alternatives, (2) bench-scale screening of ultrafiltration membrane candidates, (3) pilot-scale study at the Illinois Hazardous Waste Research and Information Center (HWRIC), and (4) full-scale implementation and testing onsite at the company's facility. ull-scale testing integrated the new waste reduction scheme into the facility's production process by applying ultrafiltration directly to the 5000-gal iron phosphating/degreasing bath. ltrafiltration-successfully removed oil contamination from the bath and returned clean process solution back to the original 5000-gal tank. ltrafiltration concentrated the hazardous component down to 10 gal of oily waste and reduced hazardous waste generation 99.8%. Permeate flux --rates were high enough to compete with the constant input of oil from the production line, and concentrations of oil in the bath were maintained at acceptable operating levels. he estimated payback period associated with implementing ultrafiltration was only 6.9 mo.