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Diurnal variation of gas emission and air quality from three types of swine rooms in summer

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  MBSK 06-308,  ASABE/CSBE North Central Intersectional Meeting . (doi: 10.13031/2013.22381) @2006
Authors:   Yuanyuan Wang, Huiqing Guo, Dena Burnett
Keywords:   Swine, barn, ammonia, hydrogen sulfide, carbon dioxide, emission rate, dust concentration, dust deposition

The concentrations and emission rates of ammonia, hydrogen sulfide and carbon dioxide were measured from a nursery, a farrowing and a breeding/gestation rooms in summer. The gases were sampled every three hours in 48 hours. Dust concentration (08:00-16:00) and dust deposition (48-h) were also measured. The exhaust gas concentrations had an inverse relationship with ambient temperature and ventilation rate and their diurnal patterns were similar for all three rooms. The average gas concentrations were 6.6 ppm, 460 ppb, 1353 ppm;4.7 ppm, 541 ppb, 1011 ppm; 4.9 ppm, 274 ppb, 1012 ppm for NH3, H2S and CO2, in nursery, farrowing, and breeding rooms, respectively. The diurnal variations of gas emission rate were not significant in the nursery and farrowing rooms with the NH3 emission rate 0.24± 0.04, 0.14±0.03 mg/s/m2, H2S 25.41±3.52, 24.26± 4.21 µg/s/m2, and CO2 7.40 ± 01.11, 2.61± 1.10 mg/s/m2 for nursery room and farrowing room, respectively. The breeding/gestation room presented a large diurnal variation and had several peaks within two days. The maximum emission rate was 4.59 mg/s/m2, 239.63µg/s/m2, and 71.43 mg/s/m2 for NH3, H2S and CO2, respectively. The dust concentrations were 1.06, 0.19, 0.75 mg/m3, in nursery, farrowing, and breeding rooms, respectively. The dust deposition rates were 35.72, 6.37, and 14.86 mg h-1m-2 in nursery, farrowing, and breeding rooms, respectively. None of the measured air quality parameters exceeded the thresholds of the Occupational Health Regulations. The farrowing room had better air quality than the nursery and gestation rooms.

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