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AIR QUALITY OF SWINE WEAN-FINISH FACILITIES WITH DEEP-PIT AND PULL-PLUG-LAGOON MANURE STORAGE SYSTEMS
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Proceedings of the Seventh International Symposium, 18-20 May 2005 (Beijing, China) Publication Date 18 May 2005 701P0205.(doi:10.13031/2013.18366)
Authors: L.Y. Zhao, R. Manuzon, M. Brugger, G. Arnold, and Roger Bender
Keywords: Swine, finishing facilities, air quality, dust, odors, carbon dioxide, ammonia, hydrogen sulfide
Indoor and outdoor air quality of large and concentrated livestock facilities from swine farms are
increasing concerns to producers and the local community. Odor has received the most attention
due to neighbors complaints. Effects of different swine facilities on air quality parameters are
very useful information for planning and managing swine facilities.
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The study aimed to develop methodology and protocols to assess air quality of large swine
facilities, measure air quality and environmental parameters of two typical swine wean-finish
facilities in the US Midwest, and analyze the facilities effects on indoor and outdoor air quality.
Two large swine farms, one with deep pit and the other with pull-plug shallow pit and outdoor
lagoon manure storage systems were monitored. Concentration of gases and dust at 8 to 10
indoor locations and 4 outdoor locations were measured in three seasons using portable gas and
dust analyzers. Odor samples were collected from odor sources, upwind, 500 downwind of the
farm. Gas and dust levels at the intake of the first stage 24 in exhaust fan were continuously
monitored for at least 3 days in each season.
The preliminary results indicated large spatial and temporal variations of indoor air quality in the
swine facilities. In the deep-pit swine building, the average ammonia and dust concentration
decreased from 17.0 to 1.4 ppm and from 2.7 to1.9 mg/m3, respectively, as ventilation rates
increased from winter (15,000 cfm) to summer (98,000 cfm). However, hydrogen sulfide and
exhaust odor levels were relatively stable at concentrations of 200-300 ppb and 1,300 OU/m3 for
all three seasons, respectively. In the pull-plug swine building, average ammonia concentration
was 22.0 ppm, hydrogen sulfide 566 ppb, and dust 1.1 mg/m3 in cold days. Continuous gas and
dust data also showed that indoor pollutant concentrations fluctuated over time. Daily variations
of ammonia and dust concentrations were often significant. Daily variations of hydrogen sulfide
concentrations were not significantly different in three days of each season, but significant from
season to season. Hourly variations of dust and hydrogen sulfide concentration in each day each
and hourly variations of ammonia concentrations in afternoons were not statistically different