Analysis of Long-term Data for Stabilizing the Waste in Closed System Disposal Facilities

摘要

This study analyzed extensive field data related to waste stabilization over a period of 10years, including temperature within the waste layer and the quality of landfill waste basedon an elution test, for real closed system disposal facilities (CSDFs), which are landfill siteswith roofs, and the more widely used open system landfill sites (OSLSs). The objectives ofthis study were: 1) to clarify the role of artificial watering during landfill waste stabilizationin CSDFs and 2) to compare the degree of landfill waste stabilization in CSDFs and anOSLS in term of the volume of water required for waste stabilization. The results show thatwatering is necessary for landfill waste stabilization in CSDFs, based on a comparison ofthe waste quality in CSDFs with and without watering. Watering contributed more to theremoval of pollutants by washing compared with biodegradation in CSDFs. The results ofthe elution tests using waste sampled from CSDFs and an OSLS showed that there weredecreases in the total organic carbon and chloride ion concentrations over time after landfill,whereas there were no differences in the elution test results between the CSDFs withartificial watering and the OSLS with natural precipitation. Based on our analysis of longtermfield data, this study suggests that the volume of water required to stabilize waste canbe reduced significantly in CSDFs, thereby decreasing the cost of leachate treatmentcompared with OSLSs.