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Anim Biosci > Accepted Articles
https://doi.org/10.5713/ab.22.0111    [Accepted] Published online June 24, 2022.
Seasonal atmospheric characteristics in a swine finishing barn equipped with a continuous pit recirculation system using aerobically treated manure
Choi yongjun1  , Duck-Min Ha2  , Sangrak Lee1  , Doo-Hwan Kim3,* 
1Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea
2Agri-Food Bio Convergence Institute, Gyeongsang National University, Jinju 52725, Korea
3Division of Animal Science, Agri-Food Bio Convergence Institute, Gyeongsang National University, Jinju 52725, Korea
Correspondence:  Doo-Hwan Kim, Tel: +82-557723284, Fax: +82-557723284, Email: dhkim61@gnu.ac.kr
Received: 18 March 2022   • Revised: 28 April 2022   • Accepted: 18 May 2022
Abstract
Objective
This study was conducted to determine the seasonal characteristics of odorous material emissions from a swine finishing barn equipped with a continuous pit recirculation system (CPRS) using aerobically treated manure.
Methods
The CPRS consists of an aerobic manure treatment process and a pit recirculation system, where the solid fraction is separated and composted. The aerated liquid fraction (290.0%±21.0% per day of total stored pig slurry) is continuously recirculated to the top of the slurry in the pit. Four confinement pig barns in three piggery farms were used: two were equipped with CPRS, and the other two operated a slurry pit under the slatted floor across all seasons.
Results
The indoor, exhaust, and outside odor intensities were significantly lower in the CPRS group than in the control group (p<0.001). In the CPRS group, the odor intensity outside was significantly lower in the fall than in the other seasons (p=0.015). In the indoor atmosphere, the temperature and CO2, NH3, and H2S contents of the CPRS group were significantly lower than those of the control group (p<0.05). In the CPRS group, indoor temperature did not significantly change in the spring, summer, and fall seasons and was significantly lower in the winter (p=0.002). NH3, H2S, MM, DMD, TMA, phenol, indole, and skatole levels were significantly lower in the CPRS group than in the control group (p<0.05). There were significant seasonal differences on the odorous material in both the control and CPRS groups (p<0.05), but the pattern was not clear across seasons.

Conclusion

The CPRS can reduce the indoor temperature in the summer to a level similar to that in the spring and fall seasons. The CPRS with aerated liquid manure is expected to reduce and maintain malodorous emissions within acceptable limits in swine facilities.
Keywords: Aerated Liquid Manure; Continuous Pit Recirculation System; Indoor Atmosphere; Odorous Material; Swine Facility


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