Observation And Prediction Of Methane Emissions From Landfill

In the context of global warming, greenhouse gas (GHG) emissions on global climate change has caused widespread concern of Governments and scholars. As one of the major GHG, the emission source of methane (CH4) has become the focus of attention of foreign scholars because warming and growing fast. Studies have shown that the landfill CH4is the largest source of release by human, with the increase in the amount of landfill, the landfill greenhouse gas emissions increasing year by year. Therefore, the article predicted the future waste output in Nanjing or national and estimated the amount of the landfill CH4emissions based on the measurement data of surface CH4release rate in the Nanjing Tianjingwa organic waste disposal sites by field static chamber-gas chromatography. The specific research results are as follows:1. According to the production of municipal solid waste (MSW) in national and Nanjing past years, we established the relationships between MSW and time, GDP and population, and built variable weight combination forecasting model based on three relationships, which can forecast the future the productionof MSW. The results show that MSW production in2050is236,649,360tons, Nanjing MSW production is2,880,760t.2. Greenhouse gas emission was estimated by the IPCC models Maticorena model and landfill gas production model based on the output of the predicted MSW. The simulation results show that, The CH4emissions of national and Nanjing were4.7914million tons and57,770tons to the2050.3. The CH4release rate in the Nanjing Tianjingwa organic waste disposal sites were12.98-10801.22mg·m-2·h-1, with the average2404.94mg·m-2·h-1in summer; of4.75to4046.10mg·m-2·h-1, with the average2282.12mg·m-2·h-1in autumn; r8.64to3262.45mg·m-2·h-1, with the average938.09mg·m-2·h1in winte. Overall, the landfill surface CH4release rate pressure correlation with temperature and pressure, the general higher temperature, the release rate was higher, and pressure was on the contrary. Release rate were not well determined with air humidity. May be affected by soil factors, such as porosity, hardness, or landfill surface soil cracks, CH4release rate shows a great deal of randomness the performance of different field point of landfill.4. CH4total of the Nanjing Tianjingwa organic waste disposal sites simulated by IPCC model, the Maticorena model and the landfill gas model were578.142tons,852.352tons and941.914tons respectively in2011. The field experiments indicate that CH4release rate on the landfill surface of the landfill was-3.726～259.445g· m-2·d-1, with the average of40.393g·m-2·d-1It show that CH4release rate variation of the landfill is complex at different times and regions Combined with other domestic and foreign research results. And it needs to make a specific study depending on the circumstances.