Fixation of heavy metals in scrubbed municipal solid waste incinerator ash

Fly ash generated from incineration of municipal solid waste (MSW) when placed in landfills under mild acid conditions can leach lead and cadmium. A process for stabilizing heavy metals in this fly ash is presented which involves calcining in the presence of an oxygen containing gas stream at a temp...

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Bibliographische Detailangaben
Hauptverfasser:	GIVENS, EDWIN NEIL, KLOSEK, JOSEPH, TRACY, KENNETH DAVID, WONG, KAI PURI, ALTEMOSE II, FRANCIS ALAN, BUCCI, DONALD PETER, EASTERBROOK, NANCY CANALES
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING ORPROTECTING AGAINST HARMFUL CHEMICAL AGENTS FIRE-FIGHTING HUMAN NECESSITIES LIFE-SAVING
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Beschreibung
Zusammenfassung:	Fly ash generated from incineration of municipal solid waste (MSW) when placed in landfills under mild acid conditions can leach lead and cadmium. A process for stabilizing heavy metals in this fly ash is presented which involves calcining in the presence of an oxygen containing gas stream at a temperature greater than about 375 DEG C and substantially less than about 800 DEG C for times from about 170 seconds up to about 5 hours fly ash which has been subjected to lime scrubbing for acid gas removal. Such treated MSW fly ash will give leachates containing heavy metal concentrations less than the EPA regulatory limit.