Abstract
Due to rapid degradation of the newly filled municipal solid waste (MSW), the local temperature of the waste layer increases greatly. The mechanical parameters related to waste degradation and the deformation of high-density polyethylene (HDPE) pipes in the waste body will be affected by the elevated temperature. To predict the temperature distribution in the anaerobic landfill, a one-dimensional heat transfer model is established in this study. This model considers the stratification of the saturated and unsaturated zones, and the layering of new and old waste. Furthermore, a single peak model for heat production is applied as the source term of heat production. The stratification of the unsaturated and saturated zones is considered by distinguishing the difference in heat conductivity and specific heat capacity. The layering of the new and old waste layers is considered by distinguishing the difference in the length of time that waste has been degraded to produce heat. Based on the numerical calculation method, the temperature distribution in a landfill with layered new and old MSW is well simulated. The position where the maximum temperature occurs and the variation in the temperature at the edge of new and old waste are elucidated. The sensitivity analysis shows that the influence of the density on the temperature distribution is more significant. Besides, the stratification of saturated–unsaturated waste should also be considered in landfills.
Highlights
Due to rapid degradation of the newly filled municipal solid waste (MSW), the local temperature of the waste layer increases greatly
The biodegradation reaction causes an increase in waste temperature, and the normal working performance of high-density polyethylene (HDPE) pipes and the geomembrane in the landfill will be affected by high temperatures[1,2]
To establish a model for predicting temperature in landfills, it was assumed that the density, heat conductivity and specific heat capacity of waste are isotropic, and these parameters do not vary with time
Summary
Due to rapid degradation of the newly filled municipal solid waste (MSW), the local temperature of the waste layer increases greatly. To predict the temperature distribution in the anaerobic landfill, a onedimensional heat transfer model is established in this study This model considers the stratification of the saturated and unsaturated zones, and the layering of new and old waste. The layering of the new and old waste layers is considered by distinguishing the difference in the length of time that waste has been degraded to produce heat. If it is necessary to predict the temperature in such landfills, the stratification of the new and old waste and the stratification of the saturated–unsaturated waste should be considered in the establishment of theoretical methods. A one-dimensional heat transfer model for estimating the temperature in a landfill with layered new and old waste and layered saturated and unsaturated waste is presented in this study. The significant sensitive parameters of the temperature distribution are discovered
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