Contaminant Transport Modeling due to Leachate Leaking of Rasht waste disposal site

Authors

Department of Geology, Kharaizmi University, Iran

Abstract

The current study evaluated Rasht waste disposal site which is considered as one of the contamination sources in the northern part of Iran. The current research used the Visual HELP and HYDRUS 3D softwares to determine the rate of leachate product and assess the contaminant transport respectively. The rate of leachate product was determined according to structural and climatological conditions of waste disposal site which was equal to 0.69 m/year. The Nitrogen-Ammonia (N(NH4+)) used in the present study was considered as a conservative factor for evaluation of contaminant transport. The analysis of the breakthrough curve of p1 and p2 which are located below blocks 1 and 3 of the waste disposal site respectively, denotes that increasing the concentration of Nitrogen–Ammonia continues to 4 years when leaking has started. After this time, the concentration begins to reduce and this process continues to the approximate concentration of 5000 for p1 and 6000 mg/m3 for p3. The analysis of p5 that is located at 610 meters of west end of waste disposal site shows that the contaminant pulse with concentration of 1mg/m3 enters this point after 2 years. The breakthrough curve of p7 which is located at 750 meters of north waste disposal site denotes that the concentration of 45mg/m3 inters this point after 10 years. In order to analyze the infiltration of contaminant in depth below the surficial sediments, the concentration changes were assessed at p8 to p12 which were located in bedrock.
 

Keywords

References

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