Minimizing pit emissions from pig barns to optimize 'catch and treat' mitigation technologies like biofilters

摘要

Ammonia, Hydrogen Sulfide, Particulates (PM_(10)), and odor emissions were measured from a deep-pit pig finishing barn in southern Minnesota for eight months beginning in November 2005. The effect of changing pit ventilation rates from 0, 2.1,5.0 and10.5 m~3/s (0,4,10, and 20 cfm/pig) were used to compare indoor air quality along with gas, particulate, and odor emissions. The winter results presented in this paper indicate that pit ventilation has little impact on indoor air quality as measured by ammonia and hydrogen sulfide concentrations. Total building emission of ammonia and hydrogen sulfide was actually the lowest when all of the ventilation was provided by wall fans. PM_(10) concentration was typically an order of magnitude higher in the wall exhaust than the pit exhaust. Total PM_(10) emission was found to decrease as pit ventilation rates increased. Odor emission was similar to PM_(10) emission in that the highest odor emission was measured when there was no pit ventilation.