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REDUCTION OF SELECTED PATHOGENS IN ANAEROBIC DIGESTION

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

Citation:  Pp. 074-082 in the Ninth International Animal, Agricultural and Food Processing Wastes Proceedings of the 12-15 October 2003 Symposium (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003.  701P1203.(doi:10.13031/2013.15236)
Authors:   P. E. Wright, S. F. Inglis, S. M. Stehman, and J. Bonhotal
Keywords:   Anaerobic Digestion, Pathogen Reduction, Mycobacterium Avium paratuberculosis, Composting

Anaerobic digesters are becoming a popular waste treatment option in New York State. These systems generate energy for on-farm use and sale while providing significant odor reduction. Research has shown that mesophilic systems (T=100oF) have the potential to reduce pathogens entering the environment. A plug flow digester was monitored for 14 months starting in May 2001. Samples taken from the digester influent and effluent were tested for the fecal coliform group of indicator organisms and Mycobacterium avium subspecies paratuberculosis (Map). M. avium paratuberculosis is the microorganism responsible for Johne’s disease in dairy cattle and other ruminants. Results show almost a 3-log reduction in fecal coliforms and slightly more than a 2-log reduction in Map. This paper describes an anaerobic digester and shows the comparative results of testing between a farm with a digester and a farm without a digester. Since both farms in this study compost and sell excess solids, analyses were done on the composted manure as well.

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