Hidehiro Kaneko* and Minoru Yamaguchi*

*Faculty of Engineering, Yamanashi University

+ Correspondence should be addressed to Hidehiro Kaneko:
Faculty of Engineering, Yamanashi University
(4-3-11, Takeda, Kofu, Yamanashi 400, Japan)

Abstract

Single batch extractions were performed on municipal waste incinerator fly ash. The effects of stirring speed, solid to liquid ratio, contact time, pH and the type of acid which was added to maintain pH constant during extraction on the amounts of heavy metals released from fly ash were investigated. It was confirmed that the extraction conditions which were defined in the Availability Test (NVN 2508) gave the maximum release of cadmium, copper and zinc. These conditions, however, were not aggressive enough to obtain the maximum release of iron, manganese and lead. The release of manganese was limited by pH and the release of iron was limited by pH and contact time. Acetic acid was more suitable pH controlling chemical than hydrochloric acid in evaluating the release of lead.

Key words: leaching test, hazardous wastes, heavy metals, fly ash, availability for leaching