Study On The Biodegradation And Settlement Model Of Municipal Solid Waste Landfill

With the fast progress of urbanization and enhancement of living standard, municipal solid waste increases greatly. In light of China's present situation, China deals with the garbage in way of sanitary landfill. However, problems brought with settlement should be given more attention in the construction, exploitation and operation of landfill sites. The paper mainly discusses the following aspects:(1) The study on engineering property of garbageThe choice of engineering property of garbage has a great influence on the design of landfill sites, the lifetime of landfill units and the construction circle. Basing on the wide accumulation of studying materials on engineering property of garbage, combine geographic situations, economic development level and weather conditions in Chongqing, we conduct the study in the ways of disposing rubbish , producing situation, influencing factors, engineering property and chemical nature of life garbage in Chongqing.(2) The study on factors influencing organic matter degradation of life garbageAccording to the engineering property of municipal solid waste and features of segments in Chongqing city, we start the experiment in the fixed changes of quality, the changing situations of sample quality in the process of the experiment was recorded and the procedures of organic matter degradation was described in order to avoid randomness and non-uniformity in choosing samples. In the experiment, we mainly discuss the following three parts including water content, the size of organic particles and different groups and analyse what impact the three parts give to degradation.Through the experiment, changing model of organic quality and degradation rate model of organic matter are obtained.(3) Study on the organic gas production rate modelAiming to the inefficiency of Scholl Canyon model and the fast decrease of gas production rate of municipal solid waste, in assumptive situations, according to the experiment of organic degradation, we analyse the decreasing reasons of sample quality, combine the reaction equation in the degradation process, take advantage of the sub-function and take the situation before the peak of gas production into consideration , as a result, establish the organic gas production rate model.(4) Study on the degradation settlement model In light of former study, we consider the rate of degradation and density of garbage and take its density, quality and volume into account and deduce one-dimension degradation- settlement model in the perspective of the fact that there is no changes in gas quality, The model pays more attention to the changes of density before and after degradation, shows the relationship between the amount of degradation, the percentage of organic matter in garbage , degradation rate and the initial height.(5) Study on the coupling settlement modelOne dimension fluid-mechanical-thermal coupled model was deduced under suppose the municipal solid waste landfill is elastomer and without considering the thermal source. Apply finite Fourier transform and its inverse transform to solve this model and got the expression of pore pressure, temperature and displacement.