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Cold Temperature Impacts on Treatment of Meat Processing Wastewater

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

Citation:  Paper number  131583136,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Karen M Mancl, Rashmi S Gaur, Olli H Tuovinen
Keywords:   Ammonia biofilter biological treatment nitrification turkey slaughterhouse wastewater.

Wastewater treatment systems must operate year-round and over a range of environmental temperatures. Winter conditions pose the greatest challenge for the operation of open biological processes, especially wastewater treatment. A general assumption in wastewater treatment is that as temperature decreases so does treatment efficiency. Nitrification is an integral component of the treatment and is also subject to temperature control. This research examined the impact of freezing temperatures on the treatment meat processing wastewater on BOD5 and ammonia removal. Bench-scale sand/gravel and sand/textile bioreactors were operated outside through the winter months and exposed to five freeze-thaw cycles. BOD5 removal remained high (>97%) throughout the winter. Nitrification, measured as ammonia removal, remained high (99%) for the first three freeze-thaw cycles, but diminished for the last two freeze events. Nitrification resumed high levels in early spring.

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