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Evaluation of Ekokan Biofiltration Treatment System on a Swine Farm

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

Citation:  Paper number  034125,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13881) @2003
Authors:   Philip W. Westerman, Jactone Arogo, Alexandra Kantardjieff, Philippe Kantardjieff
Keywords:   Swine manure treatment, biofilters, biofiltration, nitrification

Ekokan biofiltration treatment system is one of several systems chosen for demonstration and evaluation as a candidate for Environmentally Superior Technology determination under an agreement with Smithfield Foods, Inc and the North Carolina Attorney General. The Ekokan system was constructed to treat manure from about 4000 finishing pigs housed in five barns with pit-recharge system. A pit release occurrs about every 4 hours resulting in about 681m3 (180,000 gal.) wastewater per day. After a solids/liquid separation (conveyor/screen separator), the waste water is pumped to an equalization tank, and then gravity flows through two sets of two-stage upflow aerated biofilters that have fixed media. Biofilters are periodically cleaned or flushed to remove excess organic material. Part of the treated effluent is recycled to dilute influent, and the rest is stored in a partitioned section of the pre-existing anaerobic lagoon. Liquid from this section is pumped to the barns to recharge the pits. Information on the demonstration/evaluation procedure is presented, as well as system design, startup of the system, and data for flows and performance of the system for January through March 2003.

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