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Variation of CH4, CO2, and O2 concentrations in layers of different depths in semi-aerobic and anaerobic landfills was analyzed over a period of 5years. The results showed that most of the municipal solid waste became basically stable after 5years of landfill disposal. In the upper and middle layer, the concentration of CH4 in the semi-aerobic landfill was significantly lower than that in the anaerobic...
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