Experimental Study on Treatment of Hospital Waste Incineraten Fly Ash by Solidification Process with Cement

It was found that cement can immobilize the heavy metals of hospital waste incineration fly ash. Based on this, a method of hospital waste fly ash management with cement solidification was proposed. In the nature hospital waste incineration fly ash, the leachate concentration of Zn (279.2 mg/L) and Pb (19.88 mg/L)) exceed the regulatory limit for the TCLP test. In the cement solidified fly ash, the leachate concentration of Zn was in excess of the standard limit while the leachate concentration of Cd, Ni, Cu and Pb were under the limit of the standard, and the leachate concentration of the heavy metals decreased with the increase of curing time (experimental curing time from 3 days to 28 days）and cement rate (cement rate was respectively 40%, 50% and 60% in the experiment).