title: Characterization of thermal properties of municipal solid waste landfills.
abstract: Municipal waste landfills represent not only a source of landfill gases, but a source of thermal energy as well. The heat in landfills is generated by physical, chemical and microbiological processes. The goal of our study was to characterize the thermal properties of municipal solid waste (MSW) samples of the given landfill. A new apparatus was designed and constructed to measure heat flow. A systematic test series of 17 discrete measurements was carried out with municipal waste samples of 1.0-1.7 m(3). The thermal conductivity, heat diffusivity and specific heat capacity of the samples were determined. Analysing the results of the sampling and our experiments it was realized that the theoretical fundaments should be clarified. Two theories were developed for the serial and for the parallel heat flow in three phase disperse systems. The serial and parallel models resulted in different theoretical estimations. The measured thermal conductivity and heat diffusivity were better characterized by the parallel heat flow estimations. The results show that heat can flow parallel in solid, liquid and gas phases. Characterization of thermal properties serves to establish the fundament of heat extraction from municipal waste landfills.
authors.affiliation: Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, Hungary. Electronic address: ejtfaitj@uni-miskolc.hu.
authors.forename: József
authors.initials: J
authors.lastname: Faitli
authors.affiliation: Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, Hungary.
authors.forename: Tamás
authors.initials: T
authors.lastname: Magyar
authors.affiliation: .A.S.A. Hungary Ltd, Hungary.
authors.forename: Attila
authors.initials: A
authors.lastname: Erdélyi
authors.affiliation: Institute for Soil Science and Agricultural Chemistry, Centre for Agricultural Research, Hungarian Academy of Sciences, Hungary.
authors.forename: Attila
authors.initials: A
authors.lastname: Murányi
mesh_terms: D006358:Hot Temperature; D008962:Models, Theoretical; D012037:Refuse Disposal / Q000379:methods*; D062611:Solid Waste / Q000032:analysis*; D064091:Waste Disposal Facilities
chemical_list: D062611:Solid Waste
keywords: Heat diffusivity; Heat extraction from municipal solid waste landfills; Specific heat; Thermal conductivity