LFG to RNG process description

LFG (landfill gas) can be upgraded to produce RNG (renewable natural gas), which is a highly purified form of methane that can be used as a substitute for conventional natural gas. The process of converting LFG to RNG involves several steps, including:

Collection: LFG is collected from the landfill using a network of pipes that are buried underground. The gas is typically a mixture of methane (50-60%), carbon dioxide (40-50%), and trace amounts of other gases.

Pre-treatment: The collected LFG is first pre-treated to remove any impurities, such as moisture, hydrogen sulfide, and other trace gases. This is typically done using a series of filters and scrubbers.

Compression: The pre-treated LFG is then compressed to increase the pressure and reduce the volume of the gas, making it easier to transport.

Upgrading: The compressed LFG is then upgraded to produce RNG, which involves removing the carbon dioxide and other impurities from the gas to produce a high-purity form of methane. There are several methods for upgrading LFG to RNG, including pressure swing adsorption, membrane separation, and cryogenic separation.

Purification: The RNG is then purified to remove any remaining trace impurities, such as water vapor and other contaminants. This is typically done using additional filters and scrubbers.

Distribution: The purified RNG is then ready for distribution and use. It can be injected into the natural gas pipeline system, where it can be distributed to customers for use in heating, cooking, and other applications.

Overall, the process of converting LFG to RNG is an important step in the transition to a more sustainable and renewable energy future. By capturing and purifying methane that would otherwise be emitted into the atmosphere, RNG provides a valuable source of clean energy that can help reduce greenhouse gas emissions and combat climate change.

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