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Methods to recover nutrients and energy from swine manure Public Deposited

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  • Disposal of manure is a major problem, yet manure could be a valuable resource. It is a source of digestible organic material, plant nutrients, and protein. This report describes methods for the recovery of energy and protein from swine manure. Energy and material balances are presented for several management systems with emphasis on one designed to maximize recovery of biogas and a second one designed to maximize recovery of protein. Analyses compare the energy needed to produce the feed for 100 pigs and raise them with the energy which can be derived from the manure discharged by these pigs. The protein needs of the 100 pigs are compared with the protein which could be recovered from the manure by means of fermentation processes or by growing algae. Since the C/N ratio of the manure is low, yield of biogas and protein can be increased by adding properly treated straw. On-farm energy needs are about 85 Mkcal/yr (million kilocalories per year). When biogas recovery is emphasized, the manure yields 38 Mkcal/yr without straw added and 121 Mkcal/yr with straw added. The protein needs are about 13,000 kg/yr. A farmer could recover 27 Mkcal/yr of biogas and 4,000 kg/yr of protein or 59 Mkcal/yr of biogas and 6,500 kg/yr of protein with straw added. Interpretations of data in the report should be made with care. The proposed systems have not been operated under "real world" conditions. The report presents potential processes that have considerable promise for successful development through further research. It does not give an account of existing technology.
  • Published May 1979. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
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