A new way to stabilize fly ash from municipal incinerators

Journal Article · Tue Dec 31 04:00:00 EST 1996 · Waste Management

DOI:https://doi.org/10.1016/S0956-053X(97)00013-5· OSTI ID:566313

Derie, R ^[1]

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1. Free Univ. of Brussels (Belgium). Dept. of Ore Dressing

Heavy metals and toxic chlorinated organics, added to very low grain-size distributions, make fly ashes from municipal incinerators a very hazardous waste. For their disposal, the present general trend is, not only to stabilize chemically the ashes, i.e., to reduce the leachability of the toxic substances, but also to stabilize them mechanically, i.e., to convert them into massive, resistant, and unleachable solids. This paper describes various stabilization methods used on representative European fly ash samples, which led to the development of a new stabilization technique taking place in four stages: elimination of the alkali chlorides by dissolution; addition of a moderate quantity of phosphoric acid; calcination; and solidification with Portland clinker or cement. The principal advantages of the process are as follows: the polychlorodibenzodioxins-polychlorodibenzofurans are destroyed, the reactivity of the heavy metals is reduced drastically, the final solids have satisfactory mechanical properties, and the increase in weight of the waste to be disposed of does not exceed one fourth. Comparative results of TCLP extraction tests are presented.

• OSTI ID: 566313
• Journal Information: Waste Management, Journal Name: Waste Management Journal Issue: 8 Vol. 16; ISSN WAMAE2; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
BENZOFURANS
DIOXIN
FLY ASH
INCINERATORS
METALS
MUNICIPAL WASTES
STABILIZATION
TECHNOLOGY ASSESSMENT
WASTE PROCESSING