Abstract:
Understandings of gas and heat transport in the landfill covers are essential for enhancing
the landfill site stabilization and reducing the greenhouse and toxic gas emissions. Gas diffusion and
thermal conduction are main mechanisms for gas and heat transport in soils. Gas diffusion coefficient
and thermal conductivity govern gas diffusion and thermal conduction, respectively. In this study, we
developed a unified predictive model for gas diffusion coefficient and thermal conductivity considering
soil compaction level. Numerical simulations of gas (methane, carbon dioxide, and oxygen) and heat
transport in a landfill cover were performed using the developed predictive model. Increase of
compaction level enhanced not only heat transport in the landfill cover but also methane gas emissions
due to reduced methane gas oxidation nearby soil surface.
