Abstract
Since most dioxins produced by the incineration process are deposited in incineration residues, MSW landfill can be a possible dioxin source to the environment through the dispersion of residues. In this study, the possibility of residue dispersion was studied by using a lab-scale wind chamber. An operational target to prevent dispersion was then proposed.
Incineration ashes from four different MSW incinerators were used in the experiment. To simulate dumping residues in a landfill, ash was charged from the top upstream of the chamber. Only fine particles of less than 250 micro-meters are able to disperse, although minus 125 micro-meter size particles have a high dispersion rate. Increased moisture content (MC) was found to reduce dispersion rate considerably. The minimum MC needed to prevent dispersion of ash was determined to be 50-70% of the initial MC as discharged from the incinerators. Fly ash treated for stabilization was also examined in terms of its fraction of fine particles.
