Experiments to Confirm the Effectiveness of Landfill pretreatment Washing on Incombustible Shredded Waste(Ver2)

Abstract

Currently, MSW landfill sites are mainly composed of incineration residue and incombustible shredded waste, although some incombustible shredded waste-based landfill sites are also beginning to exist. However, few studies have been conducted on the early stabilization of landfills with mainly incombustible shredded waste. In our previous studies, leaching tests of incombustible shredded waste have frequently detected leaching values of lead and mercury that exceed landfill standards. Therefore, we obtained samples from a MSW landfill sites that had introduced a pretreatment of incombustible shredded waste for immersion washing, and conducted simulated landfill experiments to confirm the effectiveness of the pretreatment. The results of this study have confirmed that the quality of leachate is quickly reduced by the pretreatment, and that it is possible to avoid exceeding the effluent standard, especially for mercury. This time, we dismantled a simulated landfill tank and conducted elution tests on the filling material, and confirmed that the pre-treatment for immersion washing contributes to early stabilization and that the leachate may meet the decommissioning conditions within two years after the end of landfill operation.