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Ammonia Recovery from Dairy Manure

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

Citation:  Paper number  131590424,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Anayo Thomas Ukwuani, Wendong Tao, Jianqiu Han
Keywords:   Ammonia Nutrient recovery Distillation Dairy manure.

Abstract. Manure may contribute to air pollution through volatilization of free ammonia in the animal housing, manure storage and treatment facilities, and manure-applied fields. The quantities emitted are always a factor of temperature and pH of the aqueous solution. If the temperature and pH of solution containing ammonia are increased, its solubility will decline permitting more and more ammonia to volatize. Laboratory distillation equipment was setup and about 300 mL of the stored manure filtrate was heated in a 1-L distillation flask for about 4.5 hours. Distillate produced was absorbed in a sulfuric acid solution saturated initially with ammonium sulfate so that ammonia absorbed will form ammonium sulfate crystals and settle down. Decreasing ammonia concentration and increase of NH4-N in the acid solution was monitored at different temperature and pH. Reduced NH3 from feedstock per energy input was compared. NH3 removal was fast for both digested and undigested manure with more gram/ filtrate recovered using UDDM at 100oC. More than 2.68 and 1.53g dry crystals of (NH4)2SO4 could be recovered from filtrates of UDDM and ADDM at 100 and 80oC respectively.

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