Some investigation has been done on the potential for centrally located multifarm manure digesters. CASE STUDY Haubenschild Dairy Manure Digester, Princeton, MN The following was reproduced from the Executive Summary of the publication entitled, Final Report Haubenschild Farms Anaerobic Digester, 2002 developed by The Minnesota Project Haubenschild Farms is 1000acre, family owned and operated dairy farm near Princeton, Minnesota. Haubenschilds cows are producing about percent more manure per cow than the digester was built, Haubenschild Farms entered into power purchase contract proposed by the local electric cooperative, Central Energy, who greeted the project with enthusiasm and offered Haubenschild Farms very favorable contract.
Approximately 70,000 cubic feetday of biogas is used by the enginegenerator, so it is hard to estimate exactly how much biogas is being produced.
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The building and operation of the Haubenschild Farms project received assistance from the Minnesota Department of Commerce and the Minnesota Office of Environmental Assistance. CASE STUDY Haubenschild Dairy Manure Digester, Princeton, MN The following was reproduced from the Executive Summary of the publication entitled, Final Report Haubenschild Farms Anaerobic Digester, 2002 developed by The Minnesota Project Haubenschild Farms is 1000acre, family owned and operated dairy farm near Princeton, Minnesota.
Since the expansion of the milking herd size from to about cows in the summer of and completed in of the same year.
Some of the key expected benefits of an anaerobic digester are Odor control Renewable energy production Pathogen reduction Greenhouse gas reduction Reduction in total oxygen demand of the treated manure total oxygen demand is measure of potential impact on aquatic systems Haubenschild Farms applied for and was selected as an AgSTAR Charter Farm, one of such farms selected nationwide to demonstrate farmscale anaerobic digestion technologies. When the digester was started, it was processing manure from about dairy cows, which was about half of its total design capacity of cows.
Livestock producers across the country have been researching this technology and some have established anaerobic manure digesters on their own farms. The Haubenschild Farms digester is covered 350,000gallon concrete tank installed in the ground, with suspended heating pipes to heat the manure inside the digester where bacteria breaks down the manure, creating methane. Department of Energy and The Haubenschilds are considering adding generation capacity to utilize the excess biogas. As the technology improves, the relative risk of having manure digester will decrease and the efficiency of the system will increase.
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