In municipal solid waste (MSW) landfills, degradation of organic wastes due to microbial activity generates heat and a subsequent increase in temperature within the landfill body, which induces critical concerns to manage the landfill. In this study, partition and diffusion coefficients for selected VOCs such as phenol, methylene chloride (MC), toluene (TOL), and TCE, which have different chemical characteristics, were measured for a high density poly-ethylene (HDPE) geomembrane (GM) using kinet-ic batch tests at 23 °C (room temperature), 38 °C (intermediate temperature), and 75 °C (high tempera-ture). Diffusive transport of MC and TOL at different temperatures through RCRA (60 cm-CCL with GM) profile of the liner was investigated by using one-dimensional finite difference modeling. The effect of transient temperature in the system was considered by using a constitutive equation with variables in-cluding the chemical properties to predict transport parameters. For the conditions examined, at high tem-perature (75 °C), increases contaminant concentrations by approximately 75-85% compared at lower temperature (23 °C) at 100 years. Diffusive transport of TOL is less sensitive compared to that of MC be-cause of the lower polarity and molecular activity to HDPE.
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