Simulation Study on the Dehydration and Settlement Characteristics of Surface Waste in Landfill

Surface waste dehydration and settlement process has a direct influence on leachate production and subsequent landfill system stability assessment. In this paper, the author carried out a simulation experiment and studied the effect of initial moisture content, reaction temperature, compacted density and waste granularity on surface waste dehydration and settlement, which provided a theoretical basis for the optimization of traditional landfill structure and operations. The results show that daily evaporation decreases gradually following the piecewise exponential function curve, and reaction temperature has a significant effect on surface waste evaporation. When reaction temperature increased from 25°C to 45°C, cumulative evaporation increased from 162.7g/kg MSW to 220.6g/kg MSW in the simulation experiment. Initial moisture content significantly affects leachate production of surface waste, and leachate output increased with moisture content increasing Reaction temperature had a significant influence on moisture loss, and it increases with reaction temperature. Compacted density significantly effects the settlement of landfill body. With the increase of compacted density, accumulative settlement decreases rapidly.