Landfill gas is produced by the decomposition of organic compounds and materials in waste. A distinction is made between aerobic and anaerobic processes. The composition of the gases depends heavily on the age of the landfill, the type of deposited materials, and the fill. For the first two months after filling, the gas contains higher levels of nitrogen and oxygen from the incoming air and hardly any carbon dioxide or methane. Immediately after sealing the landfill, the carbon dioxide content increases dramatically, while methane takes several more months and only begins to decompose with the onset of anaerobic
phase is formed.

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