Design of a covered lagoon methane recovery system for a flush dairy
- ICF, Inc., Universal City, CA (United States)
- Resource Conservation Management, Inc., Berkeley, CA (United States)
- BioResource and Ag. Engineering Dept., San Luis Obispo, CA (United States)
A lagoon-type methane recovery system was designed for the Cal Poly Dairy, which milks 130 cows with a total population of 296 animals. Most of the herd is housed in freestall barns where the manure is deposited on concrete and flushed with fresh or recycled water to an existing lagoon with a volume of 19,300 cubic meters. The design includes a new, primary covered lagoon of 17,000 cubic meters volume. The floating cover will be made of very low density polyethylene (VLDPE), with an area of 4,500 square meters. The predicted output of the lagoon is an average of over 310 cubic meters of biogas per day containing 60 percent methane. The methane production from the covered lagoon is adequate to produce 18 to 24 kW on a continuous basis from the present cow population. In order to account for future herd size increases, a 40 kW engine generator was specified to operate in parallel with the utility system at a varying level of output controlled by the biogas supply. The non-economic benefits of this covered lagoon include the demonstration of its operation to the students and visitors at Cal Poly which in turn will serve the California Dairy Community. Odor control is the most important non-economic benefit. Conversion of volatile solids to biogas and recovery and use of the biogas limits odor to surrounding areas. The economic benefits of the methane recovery system include the approximately 160,000 kWh of electricity produced annually, worth almost $13,000. Financial analyses for the project showed a payback of 13.7 years with a 4% internal rate of return.
- OSTI ID:
- 478746
- Report Number(s):
- CONF-960958-; TRN: 97:002640-0138
- Resource Relation:
- Conference: Partnerships to develop and apply biomass technologies, Nashville, TN (United States), 15-19 Sep 1996; Other Information: PBD: 1996; Related Information: Is Part Of Bioenergy `96: Partnerships to develop and apply biomass technologies. Volume I and II; PB: 1171 p.
- Country of Publication:
- United States
- Language:
- English
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