Two -Dimensional Analysis of Dichloromethane Migration in Landfills with Various Clayey Barrier Systems

Engineered sanitary landfills for solid waste are designed and constructed to prevent environmental damage and groundwater contamination. To prevent landfill leachate from penetrating the underlying soil layers, effective contaminant barrier systems must be properly designed and implemented. These barrier systems can be single-liner, double-liner or multi-liner systems. Landfill leachate can migrate into the underlying soil layers through various mechanisms, including advection, molecular diffusion and dispersion leading to environmental pollution and groundwater contamination. The primary function of the contaminant barrier system is to prevent the transport of pollutants and their infiltration into the underlying soil layers of the landfill, making it one of the key components of an engineered sanitary landfill. In this study, the migration of dichloromethane ions from landfill leachate in the lateral and central sections of the landfill, within different clay barrier systems, has been investigated using the MIGRATEv۹ software. Comparison of the MIGRATE v۹ software results showed that design No. ۳, which have the thickest primary and secondary liners and include a geomembrane layer and a geosynthetic clay liner in the barrier system along with compacted clay, perform well in reducing contaminant migration from the landfill base to the groundwater table. Additionally, the presence of an unsaturated natural soil layer along with the barrier system plays a significant role in reducing pollutants.

کلیدواژه ها:

Advection ، Molecular diffusion ، Dispersion ، GCLs ، Geomembrane ، MIGRATEv۹