LIFE CYCLE COST ASSESSMENT OF LEACHING LOAD CONTROL OF INCINERATION RESIDUES FOR EARLY WASTE STABILIZATION OF AN OFFSHORE LANDFILL

Abstract

 At the offshore landfill sites, it takes a long time to stabilize the waste due to structural characteristics of the landfill site, so there is a problem that it is difficult to shift to post-closure land utilization. At the offshore landfill site, pre-treatment methods that reduce the leaching load of waste are being studied. On the other hand, it can be considered that the waste discharger on the upstream side of the offshore landfill site has a part of the responsibility for reducing the leaching load, so it is also necessary to take measures on the upstream side. Therefore, in this study, we calculated and compared the LCCs when leaching load control was performed upstream and downstream of the offshore landfill site. As a result, the amount of increase in LCC was 1,369 yen /t compared to the current situation when the treatment agent was changed to control the leaching load at the incineration facility on the upstream side of the offshore landfill site. The LCC increase was 989 yen/t when the classification treatment was carried out to control the leaghing load after receiving the waste at the offshore landfill site, and the LCC increase was 1,719 yen/t when the solidification crushing treatment was carried out. On the other hand, if the post-clorsure maintainance period of the offshore landfill site can be shortened by 20 years by leaching load control, total LCC was reduced in all cases.