Report
Biogas upgrading for dairy digesters
Washington State University Extension fact sheet, 180E, Washington State University Extension
11/2024
DOI:
https://doi.org/10.7273/000007008
Abstract
Biogas generated from the anaerobic digestion (AD) of livestock manure is a reliable source of renewable energy and is most commonly used to generate electricity. In more recent years, biogas has increasingly been refined and used as a “drop in” fuel to replace natural gas in transportation applications. Financial incentives from multiple credit programs operated by the US federal government (e.g., Renewable Fuel Standard [RFS]) and by states like California, Oregon, and Washington that have clean fuels standards (also called low carbon fuels standards) are driving this trend. When biogas is upgraded to biomethane and then used directly to replace fossil fuel natural gas (FFNG), it is commonly referred to as renewable natural gas (RNG). Digester gas that is used in a cogeneration engine must be cleaned or “scrubbed” of some of its impurities to avoid damage to downstream mechanical equipment. However, upgrading biogas to RNG for transportation fuel via pipeline injection or direct vehicle fueling requires a more significant purification process. This publication will explore the differences between biogas and RNG, the impurities that must be removed, and the technological approaches currently available to refine and upgrade raw digester gas to fuel quality.
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Details
- Title
- Biogas upgrading for dairy digesters
- Creators
- Embrey Bronstad (Author)Georgine Grace Yorgey (Author) - Washington State University, WSU Extension ANRCraig Frear (Author)Jim Jensen (Author)Nicholas Kennedy (Author)
- Academic Unit
- Publications, WSU Extension
- Series
- Washington State University Extension fact sheet; 180E
- Publisher
- Washington State University Extension; Pullman, Washington
- Number of pages
- 11
- Identifiers
- 99901169440501842
- Language
- English
- Resource Type
- Report