A new equation is proposed to describe the nonlinear variation in the methane generation rate. The major change in the physical, geotechnical, and biochemical properties occurs at low (less than20 %) degrees of biodegradation. Over 90 % of the settlement during the test period was completed within 25 % degrees of biodegradation. However, opposite to common sense, the decomposition of MSWs may not significantly contribute to the settlement after analysing the relationship between the degrees of biodegradation and settlement of the MSWs. The MSWs with lower dry unit weights are more sensitive to the change in temperature, especially with leachate recirculation. The biocompression ratio increases with the environmental temperature. Increasing the recirculation rate does not significantly increase the settlement of the MSWs. Compared to water recirculation, leachate recirculation further promotes the settlement of the MSWs and methane generation. The bioreactors were recirculated with water or leachate at different rates. ![]() Three laboratory bioreactors were filled with synthetic MSWs with the composition same as that used in the field bioreactors. Four field bioreactors were filled with fresh MSWs collected from a landfill site. This paper investigates the effects of degrees of compaction (initial dry unit weights), recirculation liquid and rate, and environmental temperature on the long-term physical, geotechnical, and biochemical properties of municipal solid wastes (MSWs) biodegraded for approximately 800 days. And both the density and viscosity decrease with increasing temperatures. The results describe that the concentration of the leached alter the viscosity and density of the same, or a more concentrated leachate has higher density and higher viscosity. To determine the viscosity was used a capillary viscometer, and to determine the density was used an electronic densimeter. ![]() This process occurred at different concentrations in order to simulate the rainy period, when the leachate presents fewer concentration, and at different temperatures to demonstrate the seasons where temperature oscillations occurs. Because of this was done an experimental study to determine the behavior of the density and viscosity to leachate of Volta Redonda city Landfill. To understand it better, its's necessary to know the mechanisms governing the rheological behavior of the leachate. The impact produced by leachate in the environment is directly related with their stage of decomposition. The landfill leachate contains o its composition, basically, a mixture of organic and inorganic substances, compounds in solution and in colloidal state, and several species of microorganisms.
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