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Continuous Operation of a Full Scale anaerobic Sequencing Batch Reactor Treating Low Strength Swine Manure

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009787.(doi:10.13031/2013.29992)
Authors:   Matthew T Steele, Douglas W Hamilton
Keywords:   Anaerobic digestion, ASBR, manure, biogas

A 430 m3 full-scale anaerobic sequencing batch reactor has been operating continuously for the last two years at the Oklahoma State University Swine Research and Education Center. In August of 2008 the digester was started using a cold start technique. Startup of the reactor was accomplished without the use of a seed sludge only dilute swine manure as received from the pit recharge swine buildings. The ASBR was initially operated at a minimum temperature of 23C, 20 day HRT, and one cycle per day. After one year of operation, the HRT was incrementally reduced from 20 days to 5 days, and the cycles per day was increased from one to two. Effluent and mixed liquor sampling indicate that startup without the use of seed sludge is possible. Reactor stability has been maintained and no pH adjustment has been required. Operational parameters have been examined with regard to settling, solids retention, and mixing within the reactor. .

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