Feasibility Study On A New Estimate Method For Leachate From Sanitary Landfill

Sanitary landfill is the primary treatment area for the municipal solid wastes.The leachate come from the sanitary landfill is very seriously to pollute theenvironment for its much more COD, BOD, SS, ammonia and other pollutants thanordinary waste water. So controlling the waste leachate is very important andestimating the yield of the leachate from the sanitary landfill in the engineeringdesign is an indispensible content.On the basis of summing up the main factors of the leachate producingamounts from the sanitary landfill, and discussing the advantages anddisadvantages of estimation method for leachate, a new mathematical estimationmodel have been established for the producing amounts of leachate. The modelcombines with mathematical models and theoretical analysis, based on the waterbalance model and the empirical formula method given by pioneer researchers. Notonly the rainfall, but also the evaporation, waste moisture content and surfacerunoff are considered in the model. It makes up the deficiency of empirical formulain theory, and simplified various factors in the water balance method in practice.The model was applied in the appropriate engineering example to estimate theactual amounts of leachate. The results show that in the empirical formula method,infiltration coefficient selection has a greater impact on the calculated results of thegeneration of leachate.When evaporation is small in a year, by the empiricalformula method, the calculated results of the generation of leachate is close to theactual value. When evaporation is high, by the formula which is put forward in thispaper, the calculated results of the generation of leachate is close to the actual value.The difference between rainfall and evaporation can explain the reason for thechange of the generation of leachate throughout the year. By the formula which isput forward in this paper, the calculated result are basically consistent with theactual, can reflect that the annual trend of the generation of leachate, is line withthe result of theoretical analysis and experience, it is feasible and it has somepractical significance.