Construction technologies and management in the post-closure redevelopment of waste landfill

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The main objective of this research is to develop the construction technologies which can effectively control the geotechnical and environment risks in the post-closure redevelopment of waste landfill. The main results obtained in this study can be summarized as follows:1. Fate and transport of pollutants due to the waste disposal were analyzed by the laboratory experiments. Heavy metals and volatile organic compounds (particularly Dense Non-Aqueous Phase Liquids) are of main concern in this research. Particularly, heavy metal mobility in the coastal incinerator ash landfill was studied by analyzing the effects of chemical conditions and microbial activities with the model test. Mobility of heavy metals is significantly reduced under the typical reduced-alkaline condition, since the reducible fraction is affected and the oxidizable fraction is favored.2. Long-term performance of the engineered liner system in the waste landfill was evaluated through a series of laboratory experiments. The main concerns are 1) interface transmissivity between clay layer and steel pile installed at coastal landfill sites as the basement structure in the post-closure redevelopment, 2) hydraulic barrier performance of the liner exposed to the chemicals in the leachate and the high temperature, and 3) application of steel piles to the vertical cut-off wall in the coastal landfill.3. Construction technologies to control the environmental risks in the post-closure redevelopment of waste landfill were developed, such as the application of the soil-bentonite mixture to the vertical cut-off wall and the structural design of the engineered landfill line with the high stability. The scheme for proper waste management, including the geotechnical utilization of waste materials and the redevelopment of closed landfill, is proposed and discussed based on the achievements of this study.