Land disposal is an essential part of a comprehensive waste management system. At disposal sites, as waste decomposes anaerobic conditions develop as available oxygen is consumed. A by-product of anaerobic decomposition is methane, a combustible gas. Combined with other gases, primarily carbon dioxide, these gases, referred as landfill gas, can be captured from a disposal site. Generally methane comprises around 50% of landfill gas. The captured gas can be used as an energy source, commonly, for power (electricity) generation. Excess landfill gas at an energy recovery facility may be flared. Flaring of all the captured landfill gas may occur at disposal sites with low energy values or are too small to justify an energy recovery operation. Even though the combustion process results in the generation of carbon dioxide, it is considered carbon neutral as it is derived from biomass. CDM methodologies for landfill gas capture and use include: Documents: Wenjie, Qi; Peterson, Charles; Azizova, Zarina; Huang, Jane. "Landfill Gas Capture, Electricity Generation and the Clean Development Mechanism at the Shuangkou Landfill in Tianjin, China. Urban Planning International. Number 3. 2009. Abstracts of the papers in this edition are available at UPI’s website. Full papers (English and Chinese) are available at the World Bank Institute's Urban website, in the China Urban Program webpage.
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