Study of ashes from municipal wastes incinerated in classical grate boilers and FBC units. Solidification of MWIR with FBC coal ashes for disposal

FBC is now widely used to burn low quality coals because of its ability to meet environmental regulations, especially where SO{sub 2} emissions are of concern. The technology is also promising for a number of other fuels, especially those having high chloride contents. The characteristics of any fuel depend strongly on the combustion technique and temperature. Thus, FBC ashes would be expected to be substantially different from grate incinerator ashes. This study looks at the characteristics of ashes (MWIR) from municipal wastes, originated from various cities in Europe, and incinerated in FBC and classical grate furnace facilities. Information is also provided on the heavy metal contents and leaching characteristics of the various MWI residues. All the results are examined in light of possible utilization strategies and landfill regulations regarding the potential for co-disposal of incinerator ashes with coal derived residues from FBC boilers to render the monoliths inert and resistant against hazardous events that may occur during ultimated and definitive storage.