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Verification of Standard Sludge Accumulation Rates for Swine Manure Treatment Lagoons Based on Time-Sequenced Observations

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

Citation:  Paper number  024133,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.10502) @2002
Authors:   Douglas W. Hamilton
Keywords:   Swine manure, treatment, sludge, lagoon, solids accumulation

Sludge accumulation was observed in two lagoons treating manure removed from sow breeding and gestation farms in Oklahoma between May 21, 1996 and June 20, 2001. In a lagoon in which sludge was left undisturbed, accumulation patterns matched the complex sludge accumulation model predicted by Barth and Kroes (1985). Sludge accumulation roughly fit standard accumulation rates (0.0486 ft3/lb TS, 0.00303 m3/kg TS) during the first three years of the lagoons life. Sludge accumulation slowed as the lagoon aged. Further investigation is needed to determine if the slower rate is due to maturing microbial communities, compaction, or encroachment into the mixing zone of the lagoon. Accumulation was linear in a second lagoon in which sludge was disturbed through pumping and agitation. The observed linear accumulation rate conformed to the standard accumulation rate throughout the first seven years of the lagoons operation.

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