Abstract
Improving the understanding of the stabilization process is of great significance to guide the sustainable development of municipal solid waste (MSW) landfills. An evaluation system of the stabilization process of MSW landfills has been established. The indices of the evaluation system involve the degradation degree of MSW, the release of landfill gas production potential, and the settlement of landfills. Based on the biochemical-consolidation-solute migration coupled model, an evaluation method of the MSW landfill stabilization process is proposed by combining field tests with numerical simulation. The stabilization process of the Jiangcungou landfill in China is investigated by using the proposed method. The analyzed results show that the stabilization process of high kitchen waste content landfills can be divided into three stages, which is different from the stabilization process of landfills in developed countries. For the Jiangcungou landfill, the ratio of cellulose to lignin in MSW decreases rapidly during the fast degradation stage when obvious settlement occurs. During the slow degradation stage, the hydrolysis rate is slow and settlement develops slowly. When the landfill reaches the stabilization stage, the ratio of cellulose to lignin of MSW changes very slowly; most of the landfill gas potential has been released; the settlement stabilization is completed basically. The change processes of the three evaluation indices are different, of which the degradation stabilization index is the main one. According to the findings above, leachate recirculation is recommended to adjust the degradation environment in the landfill, which can be helpful to avoid acidification at the fast degradation stage. Temporary cover is suggested to improve landfill gas collection efficiency at the beginning of the stable methanogenic stage. The landfill site closure should be operated when the settlement rate is low.
Highlights
A large amount of municipal solid waste (MSW) is generated every year, and the growth rate of MSW production is accelerating significantly with the development of urbanization, which results in a global environmental issue
Many field and laboratory tests have been carried out to fully investigate the degradation stabilization process of MSW, and the results indicated that the ratio of cellulose to lignin content (C/L) in MSW decreases with the increase in filling depth
The first year is the fast degradation stage: the Λ1 value decreases to 0.42 rapidly after 1 year since MSW was placed in the landfill, most of the kitchen waste is consumed during this period
Summary
A large amount of municipal solid waste (MSW) is generated every year, and the growth rate of MSW production is accelerating significantly with the development of urbanization, which results in a global environmental issue. The sanitary landfill technique has been widely used to dispose of MSW in most countries [1,2]. Chemical, and biological processes occur within landfills. Leachate with a substantial amount of pollutants and landfill gas containing greenhouse gases (i.e., methane and carbon dioxide) are generated, making the landfill act as a large bioreactor [3]. The landfill becomes an earth structure as MSW is added
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