One-dimensional transient solution for landfill gas pressure in landfills

The paper summarizes depth-based changing rules of the gas permeation coefficient, establishes a one-dimensional gas pressure distribution model with consideration of depth-based changes of the permeation coefficient, and analyzes gas extraction pressure values required by different waste landfill thickness. Results show that the gas extraction negative pressure of -1kPa satisfied gas collection requirements of landfills with thicknesses of 10m, 15m and 20m. The gas extraction negative pressure of -1kPa satisfied gas collection requirements of landfills with thicknesses of 10m, 15m and 20m. On the landfill with waste thickness of 30m, landfill gas within the scope from the pile top to the 27m height under the ground could not be collected effectively, the maximum gas pressure of about 0.65kPa appeared at the 12m height under the ground.