Draft PPS18: Renewable Energy
Annex 1 Energy from Waste (Biological Processes) Technology: Landfill Gas
Most landfill sites containing biodegradable organic matter will produce landfill gas (LFG) through a complex process of microbial decomposition. The period of time over which LFG is actively produced will vary according to local conditions. Under favourable conditions, substantial gas generation from a large municipal landfill site would probably be complete within 25-30 years. However, many factors control the decomposition process, including the proportion and nature of the organic material in the waste, moisture content, temperature, acidity, and the design and management of the site. These in turn affect the quantity and composition of gas produced.