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Quicklime Stabilization of Belt-separated Swine Manure Solids

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

Citation:  Paper number  032265,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14970) @2003
Authors:   Steven R Gandy, John J Classen, Sarah K Liehr
Keywords:   Quicklime, Stabilization, Ammonia Volatilization, Swine Manure

Quicklime may be used to raise the pH of manure solids thus initiating a stabilizing effect of killing pathogens, reducing vector attraction, and controlling odors. A range of 5% to 15% quicklime doses were tested on separated manure solids. The largest dose (15%) rendered higher stabilization temperatures, a higher initial pH increase during mixing, and lower residual moisture in the stabilized product for the highest doses. Solids treated with doses of 10 and 15% quicklime can produce a stabilized product which meets the same requirements as Class A biosolid defined in Part 503 of the CFR 40. Manure treated with 10% quicklime lost approximately 80% of the original ammonia content over a period of 7 days through volatilization, an additional 10% was liberated over the next 21 days.

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