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4.3Increasing the amount of livestock in the dairy would also increase the amount of animal waste. This, in turn, would increase the volatile solids concentrations since the amount of flush water would not increase. An increase in volatile solids would increase methane production considerably. 4.4Increased conversion rates of the volatile solids into methane would improve overall methane production rates. Improved conversion rates can be accomplished by introducing heat into the liquid or by mixing the liquid in the lagoon. While mixing would be nearly impossible in a lagoon of this size, heating the lagoon contents would not be as difficult. In fact, the exhaust heat produced by the microturbine would be the perfect heating source, and it could be sent directly back into the digester lagoon via the heat exchanger installed next to the microturbine. The next phase of this project will be to set up the system to test this heating concept. 4.5Several methods might be used to minimize air intrusion into the lagoon digester system, thus improving the quality of the biogas. An anticipated improvement for this project will be to incorporate a bank-to-bank cover on the lagoon digester. In the current configuration, about 90% of the lagoon is covered, leaving small areas where the valuable methane can escape. 5.0 ACKNOWLEDGEMENTS The authors gratefully acknowledge the California State University Research Initiative (CSU-ARI) and the Western Regional Biomass Energy Program (WRBEP) for providing funding for purchase, installation and initial operation of the equipment utilized at the Cal Poly Covered Lagoon Digester. 6.0 REFERENCES Hunn, David. 2002. Operations Design and Evaluation of Cal Poly Dairy methane collection system. Unpublished Senior Project, Bio Resource and Agricultural Engineering Dept., Cal Poly, San Luis Obispo, CA. Johnson, E. 2002. Personal communication about Cal Poly Dairy annual electrical usage. Cal Poly Energy & Utilities Manager, San Luis Obispo, CA. February 12, 2002. Williams, D.W., Frederick, J. J. 2001. Microturbine Operation with Biogas from a Covered Dairy Manure Lagoon. Presented at the 2001 ASAE Annual International Meeting, held in Sacramento, California on July 30-August 1. Pp. 1-8. Williams, D. W. and Hunn, D. 2003. Western Regional Biomass Energy Program, DOE, Final Report: Biogas Production from a Covered Dairy Lagoon Digester and Utilization in a Microturbine 9PDF Image | Biogas Production From A Covered Lagoon Digester And Utilization In A Microturbine
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