The Development of an accelerated, on-site ash stabilization technology

Abstract

Ash stabilization plays an important role in the safety and security of landfills and in driving ash recycling.
An on-site technology that uses a detachable container and stabilizes ash with sprinkling water and aeration with CO₂ gas was developed. Experimental verification of this technology was undertaken (treatment condition: L/S=0.6-0.7, 24h duration). Two treatments methods were investigated using
unsieved samples of municipal bottom ash (2.2t): 1) sprinkling water only 2) sprinkling water combined with aeration using CO₂ gas.
The chloride content of treated bottom ash decreased by up to 72%. The bottom ash treated by aeration with CO₂ gas showed low solubility of Pb and exothermic reaction. Long-term elution test after the experiment showed that the chloric concentration of treated ash leachate was lower than that of untreated ash beyond the 200 day mark.