Estimation of Ammonia Emission Factors for a Mechanically-Ventilated Sow Facility in Fall

Among the 316,299 tons of ammonia emissions in Korea, the highest emission is from livestock manure. Therefore, ammonia emission control in the pig industry is an urgent priority. In this study, the ammonia concentration of a mechanically-ventilation sow house and diurnal patterns were analyzed to calculate ammonia emission factors. This study was carried out for 91 days from September to November 2021 in a pig house located in Danyang, Chungcheongbuk-do. For repeated experiments, three pig rooms with the same environmental conditions were selected and monitored for the same period. The average ammonia concentration in each room was measured to be 11.09 ppm, 13.30 ppm, and 12.73 ppm, and the ventilation rates were 50.14, 61.88, and 66.82 m³/h/pig. The ammonia emission factor was 8.2 ± 1.3, 12.7 ± 2.7, and 12.8 ± 2.2 g/day/pig in rooms 1 to 3, respectively. In this study, the average value of 11.2 g/day/pig was calculated as the final ammonia emission factor for a sow house in fall.