STUDY ON THE DRYING PROCESS OF THE SOLID WASTE IN LANDFILL UNDER ARID CLIMATE

Abstract

 A mathematical model was developed based on the theory of transport phenomena in unsaturated soil layers in order to analyze the drying process of the solid waste in the landfill under arid climate. Also, some experiments with an artificial solid waste had been conducted for investigating characteristics of unsaturated water flow including water characteristic curve in solid waste layers and for evaluating validity of the proposed model. As a result, following consequences were obtained. The liquid water flows through the micropores in solid waste layers in the drying process. The proposed model was able to mostly reproduce the evolution of temperature and volumetric water content profile in solid waste layer, which were obtained in an experiment. Finally, the drying process of the solid waste in real-scale landfill was simulated with the proposed model. It revealed that the drying of waste only occurrs near surface region even after 30 years and the drying rate of the waste gradually decreases as it progresses to inside.