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

Citation:  Pp. 496-503 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:10.13031/2013.15287)
Authors:   R. H. Zhang, P. Yang, C. A. Collar, and L. Ham
Keywords:   Dairy wastewater, Lagoon, Solid-liquid separation, Aeration

A commercial dairy wastewater management system was evaluated for solids separation and degradation. The characteristics of flush water and collected manure were determined. In addition, the performance of the solid-liquid separator and the impact of low rate aeration in the lagoons on solids degradation and odor reduction were evaluated. The characteristics of recycled wastewater for flushing was found to be very consistent over a five-month period with the standard deviations of total solids (TS) and volatile solids (VS) being 6.4% and 7.1% of the mean values, respectively. The characteristics of fresh manure collected in the flushing water was less consistent with the standard deviations of TS and VS being 26.2% and 23.6% of the mean values, respectively. Solid removal efficiency of the stationery screen separator was 26.9%, 33.9%, 36.8% and 41.5%, for TS, VS, SS, and VSS, respectively, with the standard deviations being 17.2-25.8% of the mean values. The low rate aeration of the lagoons did result in less solids build-up and reduced the odor threshold by 20 to 40%, but it had an insignificant impact on the existing sludge in the lagoons. More intense aeration is needed in order to cause significant degradation of solids in the lagoons.

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