Hazardous or toxic waste destruction or containment – Processes for making harmful chemical substances harmless,... – By hydropyrolysis or destructive steam gasification – e.g.,...
Patent
1991-09-10
1993-06-15
Bell, Mark L.
Hazardous or toxic waste destruction or containment
Processes for making harmful chemical substances harmless,...
By hydropyrolysis or destructive steam gasification, e.g.,...
588231, 588233, 588251, 588249, 106710, 106DIG1, 10628718, C04B 1808, C04B 1806, C04B 1400, C04B 1830
Patent
active
052201112
ABSTRACT:
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.degree. C. and substantially less than about 800.degree. 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.
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Altemose, II Francis A.
Bucci Donald P.
Easterbrook Nancy C.
Givens Edwin N.
Klosek Joseph
Air Products and Chemicals Inc.
Bell Mark L.
Marcheschi Michael A.
Ryder Thomas G.
Simmons James C.
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