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

Citation:  Pp. 144-152 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:10.13031/2013.15244)
Authors:   Z. Zhang and J. Zhu
Keywords:   surface aeration, swine manure, odor

A pilot-scale intermittent surface aeration device was tested in this study. A circular concrete tank (2.4m in diameter and 2.4m in depth) was used as the manure storage where manure was aerated continuously for a 10-h period per day (8am to 6pm). An identical tank was used as the control. For the aeration tank, two crisscross PVC pipe (2.55cm in diameter) structures were placed about 61cm apart along the depth with the liquid suction crisscross located on the top. A rigid PVC pipe connected two crisscrosses to each other. Openings (0.44cm in diameter) were made on the pipes at an interval of 10cm, either facing down (for the liquid suction pipes) or facing horizontally (for the liquid injection pipes). The aeration system consisted of a venturi air injector, 0.75kW horsepower centrifugal pump, and some flexible hoses that connected the PVC pipes to the pump so the whole PVC pipe structure could float and move up and down with the liquid level in the tank. The results indicated that the solid removal efficiencies increased from 9.26% to 26.90% for TS and 16.60% to 46.40% for TVS while the ratio of TVS/TS decreased from 0.57 to 0.35. The BOD5 removal efficiency remained stable around 90% to 95% after first four weeks of aeration during which it increased linearly from about 7.5% to 90%. The VFAs removal efficiency exponentially increased from 60% after one week to 98% three months later. A theoretical treatment time of three weeks would be needed to stabilize the liquid manure to reach a status without offensive odor.

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