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Modeling ammonia emissions from broiler litter with a dynamic flow-through chamber system

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

Citation:  2007 ASAE Annual Meeting  074090.(doi:10.13031/2013.23110)
Authors:   Zifei Liu, Lingjuan Wang, David B Beasley, Edgar O Oviedo
Keywords:   Ammonia, Emission model, Broiler litter, Dynamic flow-through chamber

This paper reports some preliminary efforts to evaluate effects of various influencing factors on ammonia emissions from broiler (meat chicken) houses, and to develop mathematical emission model(s) so that ammonia emissions can be predicted under given conditions. A statistical model was developed based on measurements of ammonia emissions from broiler litter in a dynamic flow-through chamber system. The model inputs include the litter total kjeldahl nitrogen (TKN) content, litter pH value, litter moisture content, litter carbon content, the mass transfer coefficient and ventilation rate. Under the designed operating condition, the mass transfer coefficient has been estimated to have an average value of 8.59 m/h. The model results showed that ammonia emission flux increased with increasing litter TKN content, pH, litter moisture content, mass transfer coefficient and ventilation rate (air flow rate), and decreased with increasing litter carbon content. The model was most sensitive to litter pH value than to other input variables.

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