ABSTRACT
In Japan, approximately 5 million tons of Incineration Bottom Ash (IBA) are discharged each year. Since Japan does not have enough space for landfilling, it is necessary to use it for construction materials. Since IBA includes significant toxic material, insolubilization is needed for effective use as a ground geo-material. This study is focused on the aging methods which insolubilize the bottom ash by natural rain and carbon dioxide in the air at the final landfill site.
This paper reports the mechanical characteristics and leaching properties of the IBA from MSW by the CBR test and leaching test to recycle the IBA as a base course material. As a result, it was revealed that the IBA can be reused as a base course material for a long cure period. Also the leaching concentration of heavy metals from IBA was influenced by aging processing. It was revealed that the concentration of lead, hexavalent chromium, cadmium and boron meet the environmental quality standard values for ground material.
