Research On Stabilization Law Of Aerobic Degradation Landfill Considering Temperature Effect

In recent years,the output of MSW in China has increased year by year,and the waste stock has exceeded 8 billion tons,while occupying more than 550 million square meters of land resources.China’s MSW kitchen waste has a high composition,and the waste undergoes extremely complex changes after landfilling,accompanied by the production of leachate and landfill gas,heat release,and compression deformation.Without manual regulation,the landfill can generally be stabilized 20-40 years after the closure,accompanied by long-term land occupation and environmental pollution problems.Aerobic degradation accelerated stabilization technology is an effective control method.Through active ventilation and oxygen supply and other control measures,aerobic degradation of organic matter in the landfill occurs,and the landfill reaches stability within 2-5 years.Research on accelerated stabilization of aerobic degradation Rules are important.In this thesis,the core of aerobic degradation is to study the interaction behavior of heat,solid,liquid,gas and chemical in the process of aerobic degradation and stabilization.The multi-field coupling mechanism of heat conduction,liquidgas migration,solute migration,and compression deformation.The main research contents and results are as follows:(1)This thesis summarizes and analyzes the research on heat conduction,aerobic degradation,liquid-gas migration,compression deformation and solute migration engineering characteristics of MSW landfills by domestic and foreign scholars.The landfill Thermo-aerobic degradation-consolidation-solute transportation coupled model,establishes a two-stage aerobic degradation model,considering the effect of temperature on the hydrolysis stage and oxidation of organic matter in waste The influence of the stage,the temperature influence coefficient is added to the biochemical degradation kinetic equation,which can reflect the influence of temperature on the growth and decline of microorganisms.The model can be used to simulate the biochemical degradation process of municipal solid waste at different temperatures,and at the same time,the corresponding terms of aerobic degradation of water,gas and heat sources are proposed.By comparing the calculation results of the model with the field test data,the reliability of the calculation results of the two-stage aerobic degradation model is verified.(2)The TBMCH coupling model of municipal solid waste landfill is used to study the stabilization law of aerobic degradation landfill considering temperature effect.Different degradation environment conditions,different leachate recharge temperature conditions,and numerical simulations under different ambient temperatures are designed to analyze the stabilization law of aerobic degradation landfills.The effect of temperature on the aerobic degradation in the landfill was studied,and the stabilization law of the landfill for the aerobic degradation of municipal solid waste under different working conditions was summarized considering the influence of temperature.(3)The law of accelerated stabilization in aerobic degradation landfill under different control measures was studied.First,the effect of different ventilation intensities on accelerated stabilization of aerobic degradation was simulated,and the most favorable ventilation intensity was obtained.On this basis,three control measures were simulated: no ventilation,active ventilation,and joint control of liquid and gas.Combined with the settlement amount,the C/L value,and the time required for the temperature of the garbage heap to reach stability,the effects of different control measures on accelerated stabilization were comprehensively analyzed.