Abstract:

A series of simulated experiments were conducted to investigate the influences of the freezing and thawing action on the performance and pollutants removal efficiency of landfill liners. The experimental results indicated that the freezing and thawing action could destroy the landfill liners, and had adverse effects on the permeability and pollutants removal efficiency. The permeability of liners without the freezing and thawing action were lower than national standard (1.0×10^-7 cm/s). However, freezing and thawing process could make the permeability of landfill liners increase 2-6 times; the removal efficiency of COD, NH⁺₄ and Cl^- varied from the initial 68.6%, 31.6％ and 70.5％ to 86.2%, 18.2％ and 23％, respectively.

Key words: lime, permeability, landfill liner, freezing and thawing, self-healing