Abstract
Experiments proved that asphalt and chemical additives can immobilize the heavy metals of hospital waste incineraten fly ash, and asphalt and chemical additive in combination can arrive better solidification effect than asphalt singly. In the nature hospital waste incineraten fly ash, the leachate concentration of Zn and Pb were significantly higher than the regulatory limit by TCLP test while the leachate concentration of Zn, Cd and Pb were respectively in excess of the regulatory limit of GB5086-1997 in China. In the solidified hospital waste incineraten fly ash with asphalt and chemical additive (four experimental chemical additives of Na2S, NaOH, Na3PO4 and the mixture of Na2S and NaOH ) in combination, the leachate rate of the heavy metals decreased with the increase of chemical additives rate in solidified fly ash. Chemical additives rate of 3% were selected for the solidification effect and economics of the application, and the leachate concentration of 5 tested heavy metals were under the limit of the standard by TCLP and GB5086-1997 of China.
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