What is landfill gas?
Landfill Gas (LFG) is the product of microbiological decomposition of landfilled refuse. The decomposition turns complex organic compounds in refuse into methane, carbon dioxide, and trace amounts of other compounds. The exact composition of landfill gas as collected varies widely depending on many factors, such as the type of refuse in the landfill, the age of the fill, the gas collection system's flow rates and vacuum levels, and the amount of atmospheric air drawn in through leaks in the landfill cap and the collection system. Without significant dilution due to leakage, LFG is commonly about 50-55% methane and about 40-45% carbon dioxide. The balance is made up of hundreds of other compounds, including nitrogen and oxygen.