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http://dx.doi.org/10.5713/ab.21.0135

Effect of aerobically treated manure on odorous material emissions from a swine finishing barn equipped with a continuous pit recirculation system  

Choi, Yongjun (Department of Animal Science and Technology, Konkuk University)
Ha, Duck-Min (Department of Animal Resources Technology, Gyeongnam National University of Science and Technology)
Lee, Sangrak (Department of Animal Science and Technology, Konkuk University)
Kim, Doo-Hwan (Department of Animal Resources Technology, Gyeongnam National University of Science and Technology)
Publication Information
Animal Bioscience / v.35, no.2, 2022 , pp. 308-316 More about this Journal
Abstract
Objective: This study was conducted to determine reduction of various odorous materials from a swine farm equipped with a continuous pit recirculation system (CPRS) with aerobically treated liquid manure. Methods: The CPRS is used in swine farms in South Korea, primarily to improve air quality in pig houses. In this study, CPRS consists of a manure aerobic treatment system and a fit recirculation system; the solid fraction is separated and composted, whereas the aerobically treated liquid fraction (290.0%±21.0% per day of total stored swine slurry) is continuously returned to 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. Results: All chemical contents of slurry pit manure in the control were greater than those of slurry pit manure in the CRPS treatment (p<0.05). Electrical conductivity and pH contents did not differ among treatments. The biological oxygen demand of the slurry pit treatment was greater than that of the other treatments (p<0.05). Total nitrogen, total phosphorus, and ammonia nitrogen contents of the slurry pit treatment were greater than those of other treatments (p<0.05). Odor intensity of the CPRS treatment was lower than that of the control at indoor, exhaust, and outside sampling points (p<0.05). The temperature and carbon dioxide of the CPRS treatment in the pig barn was significantly lower than those of control (p<0.05). All measured odorous material contents of the CPRS group were significantly lower than those of the control group (p<0.05). Conclusion: The CPRS application in pig farms is considered a good option as it continuously reduces the organic load of animal manure and lowers the average odorant concentration below the threshold of detecting odorous materials.
Keywords
Aerobic Digestion; Continuous Pit Recirculation System; Liquid Fertilizer; Odorous Material; Swine Facility;
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