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Publication Title | Microturbine Operation with Biogas from a Covered Dairy Manure Lagoon

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Paper Number: 01-6154 An ASAE Meeting Presentation

Microturbine Operation with Biogas from a Covered Dairy Manure Lagoon D.W. Williams, Professor

California Polytechnic State University, BioResource and Agricultural Engineering Department, San Luis Obispo, CA 93407 USA, E-MAIL dwwillia@calpoly.edu

J.J. Frederick, Student Assistant

California Polytechnic State University, BioResource and Agricultural Engineering Department, San Luis Obispo, CA 93407 USA

Written for presentation at the

2001 ASAE Annual International Meeting

Sponsored by ASAE

Sacramento Convention Center

Sacramento, California, USA

July 30-August 1, 2001

Abstract. This paper describes the design, construction and preliminary operation of a covered lagoon-type methane recovery system for the California Polytechnic State University (Cal Poly) Dairy. The dairy houses 300 cows, heifers and calves. A new lagoon was constructed with a liquid volume of 14,000 cubic meters. This lagoon was covered with a flexible membrane incorporating buoyant material so that the cover floats on the surface, and a gas collection system. The output of the lagoon for the present population of animals ranged from 200 to 300 cubic meters of biogas per day. The biogas will fuel 30 KW micro-turbine electric generator, which will be grid-connected with the utility system. Odor control is the most important non-economic benefit. This project will provide environmental benefits - odor control by capturing the odorous gases that result from dairy manure storage; methane, a significant greenhouse gas is kept out of the atmosphere, and water pollution is reduced through the reduction in organic matter in the lagoon. Economic benefits including electricity and process heat

are estimated to be worth $16,000 per year.

Keywords. Dairy Manure, Lagoons, Anaerobic, Methane, Digester, Biogas, Microturbine

The authors are solely responsible for the content of this technical presentation. The technical presentation does not necessarily reflect the official position of the American Society of Agricultural Engineers (ASAE), and its printing and distribution does not constitute an endorsement of views which may be expressed. Technical presentations are not subject to the formal peer review process by ASAE editorial committees; therefore, they are not to be presented as refereed publications. Citation of this work should state that it is from an ASAE meeting paper. EXAMPLE: Author's Last Name, Initials. 2001. Title of Presentation. ASAE Meeting Paper No. xx-xxxx. St. Joseph, Mich.: ASAE. For information about securing permission to reprint or reproduce a technical presentation, please contact ASAE at hq@asae.org or 616-429-0300 (2950 Niles Road, St. Joseph, MI 49085-9659 USA).

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