Organic materials (such as food scraps and yard waste) in landfills can decompose and produce landfill gas (LFG) over time. About 50% of LFG is methane, a greenhouse gas with a global warming potential 25 times higher than that of carbon dioxide over a 100-year period. LFG can be collected and burned to produce electricity.

a. Explain a process during which LFG is burned to produce electricity.
b. The Puente Hills Landfill in California contains about 123 million tons of landfill waste and burns LFG to produce electricity. In a typical landfill, one million tons of landfill waste emits approximately 432,000 cubic feet of LFG per day. Calculate how much LFG is emitted at the Puente Hills Landfill per year.

The acronym LFG stands for land fill gas. It is a gas that is produced by the decomposition of biomass in a land fill. This gas can be burnt to generate steam. This steam is used to turn a turbine and generate electricity.

If 1 million tons of LFG is burnt in a day, then 365 million tons of LFG is burnt in one year.

1 million tons of waste produces 432,000 cubic feet of LFG

365 million tons of waste produces 365 million tons * 432,000 cubic feet /1 million tons

= 1.5768 * 10^8 cubic feet of LFG

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