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  Project Summary, Review of Emission Factors and Methodologies to Estimate Ammonia Emissions From Animal Waste Handling (EPA/600/SR-02/017) May 2002

This project summary discusses recent U.S. and European information on ammonia emissions from swine farms (barns and lagoons) and assesses the information’s applicability for general use in the United States, particularly in North Carolina.

The emission rates for the barns were calculated by various methods; the rates show good agreement and suggest that the barns are a more significant source than previously thought. A general emission factor for barns of 3.7 ± 1.0 kilograms of ammonia per year per finisher pig (59 ± 10 grams of ammonia per kilogram of live weight per year) is recommended, based on the results of multiple field tests.

For lagoons, it was found that there is good similarity between the field test results and the number calculated by a mass balance method. The suggested annual ammonia emission factor for swine farm lagoons in North Carolina is 2.4 kilograms per year per pig. The emission factor for lagoons, based on field tests at only one lagoon, is considered to be less accurate than that for barns. Emission rates from sprayfields were estimated using a total mass balance approach, while subtracting the barn and lagoon emissions.


Susan Thorneloe

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