The Regularities Of Domestic Waste Egradation In Simulating Trials Of The Waste Landfill Process

Since 1980's, the amounts of urban solid waste grow in pace with social and economic growth, and the annual growth rate keeps always in 10%, which causes gigantic pressure on urban environment and ecological environment in our country. How to realize the reduce, reuse and recycle of urban solid waste has become a significant issue to be solved in our country. Sanitary landfill, as one of the efficient methods for waste final disposal, has these advantages, such as easy technology and low service cost. Landfill, as the permanent location for waste storage, needs large land to meet landfill capacity and service life, and it should meet the necessity of special geology condition, so it is difficult to choose the location. Meanwhile, landfill also locates at outer suburban in big or middle city, and the reuse of landfill will be paid more and more attention as city development and land price lifting of outer suburban.In this dissertation, the stabilization process of domestic waste landfill in Harbin was studied. We performed bench-scale accelerating simulating trials and outdoor and indoor large-scale simulating trials, and monitored the leachate and solid waste component during landfill periodically. At the same time, we also dig out and analyzed old garbage in present landfill in Harbin. Finally, we carried out mathematic fitting for the obtained data to get degradation curve of waste landfill. All of the work was considered to provide theoretical basis for the reuse of landfill.The following conclusions can be obtained in terms with our trials: temperature has bid effect on waste degradation, i.e. the higher the temperature, the faster the degradation rate. Fitting the experiment data of accelerated simulate in room temperature and 41℃, the result show that attenuation ratio of CODCr BOD5 of filtrate obtained in 41℃was 22%,6% higher respectively than in room temperature. 84 days later, the difference between them get up to 37%,24%. Household waste break down easily in higher temperature and higher humidity. The max BOD5 in outdoor simulative experiment is 60 days later than indoor simulative experiment. During landfill, the quality of leachate and solid waste component both varied regularly with degradation time. By the means of mathematic fitting, we can predict the variation of each component in different degradation time. We are sure that this study is significantly meaningful for the reuse of landfill.