DEVELOPING A MODEL TO ESTIMATE CUMULATIVE LEAKAGE OF LEACHATE FROM OLD LANDFILL TO GROUNDWATER USING HYDRUS-1D SOFTWAREMojtaba Rezazadeh, Mohammad Mousavinezhad, Ehsan Sadati Seyedmahalleh, Naser Mehrdadi and Aliakbar Yadolahi
Over 80 percent of generated waste in Iran goes to landfills, however in most cases, landfills are just open dumping sites and they do not follow recommended standards of sanitary landfills. Leachate of landfills is a threat against both surface and grand waters. In northern part of Iran (Mazandaran province) due to high precipitation and high ground water surface level, this problem is more critical. In recent years different models have been developed their to study possible effect of leachate on environment. One of the important limitations of these models is there inability to simulate the landfill site during its operation. Considering the high generation of leachate during landfills operation, this work by using of HYDRUS-1D software tried to accomplish this goal. After this new model described, cumulative leakage of leachate simulated for few years after hypothetical closure of a landfill in Babol for two different soils hydraulic conductivity below the landfill. Both of simulations didnt show any leakage to groundwater during operation of landfill; however the soil below the landfill saturated gradually. In addition as it can be expected after 35 years since beginning of landfills operation, leakage of leachate from soil with higher conductivity was slightly higher. This model explains the long term effect of leachate leakage from landfills in Irans northern cities in abstinence of leachate collection system and top and bottom liner.
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