Evaluation of Waste Fly Ash Pretreatment Process

by Carol Diggelman, Milwaukee School of Engineering, Milwaukee, United States,
Deborah Ogden, Milwaukee School of Engineering, Milwaukee, United States,

Document Type: Proceeding Paper

Part of: Environmental Engineering


A batch acid-leaching pretreatment process was investigated for its potential to reduce toxicity and leachability of a municipal waste combustor fly ash prior to land disposal. Elemental analysis of ash and ash residue quantified elements removed in this process. The ash was clearly a hazardous material as indicated by toxicity characteristic leaching procedure, TCLP, and synthetic acid rain, SAR, results for lead and cadmium. Pretreating the ash lowered its toxicity as measured by both procedures, but TCLP results exceeded regulatory limits for both metals. SAR concentrations fell below the regulatory limit for lead and was above the limit for cadmium by a factor of 1.7.

Subject Headings: Municipal wastes | Toxicity | Waste disposal | Hazardous substances | Fly ash | Ashes | Leaching

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