The objective of this project was to select various landfill methane models and to provide a
comparison of model outputs to actual long-term gas recovery data.
Improving landfill methane models has been a priority for the landfill gas (LFG) industry. The literature is not replete with models that have been compared or calibrated with landfill methane field data and modeling of methane generation and recovery is not sufficiently advanced. However, as more LFG collection systems are installed and operated, better landfill data will become available for modeling. The objective of this project was to provide a comparison of model outputs to actual long-term gas recovery data from a number of well managed and suitable landfills. Another objective was to use these data to develop better estimates of confidence limits that can be assigned to model projections.