Abstract
The objective of this study is to estimate airborne dust and ammonia contained waste air from livestock buildings, as a part of our efforts to develop techniques for removing dust and ammonia.HomePage
Closed buildings, which are becoming widespread, were investigated from April to December 2000. The dust concentration in air ventilated from the building did not correlate well with time. The average total dust mass concentration in each production period ranged from 0.6 to 4.4 mg/m3, indicating significant differences. The dust concentration correlated with the amount of ventilation, relative humidity of ventilated air and passage of days, and ventilation and passage of days significantly affected the dust concentration. The ammonia concentration in the ventilated air was higher in the summer than in the fall. As the livestock raising term increased, the ammonia concentration increased. The Offensive Odor Control Law regulates the concentration of ammonia at the boundaries of the sites. The ammonia concentration in the ventilated air exceeded the regulated concentration, which corresponds to 1 to 5 ppm, and reached the level requiring deodorization. As a result of continuously measuring the ammonia concentration, we could calculate the amount of the ammonia emitted from the building. The ammonia emission was 134.8g/day in summer and 127.0g/day in fall. As the production piriod increased, the ammonia emitted per day increased.Keywords: Dust, Ammonia, Ventilated Air, Closed Livestock Building, Pig building