Abstract
For highly urbanized cities where there is a scarcity of land available for landfilling, incineration of refuse is a feasible solution for solid waste disposal. After incineration, about 20% by weight of fly ash and other residues are produced and disposed of by landfill. Leachate tests carried out on samples of fly ash show that the heavy metal concentrations of the leachate are in excess of the permissible limits set by WHO. Lime and cement are used to stabilize the fly ash. The concentrations of heavy metals in the leachates of lime and cement treated fly ash are non-detectable. In additional to pollution control, the lime and cement treated fly ash significantly improves the properties of soft clay.
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