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| Ammonia and greenhouse gas emissions from enclosed pig house with side-vent ventilation in winter season |
| Received:December 18, 2019 |
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| KeyWord:barn flush water;side-vent ventilation;climate conditions;ammonia;methane;carbon dioxide |
| Author Name | Affiliation | E-mail | | ZHOU Zhong-kai | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Institute of Facilities and Equipment in Agriculture, Jiangsu Academy of Agricultural Science, Key Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | | | YANG Dian-lin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHANG Hai-fang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHAO Jian-ning | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | zhaojianning@caas.cn | | WANG Li-li | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | YU Gang | Institute of Facilities and Equipment in Agriculture, Jiangsu Academy of Agricultural Science, Key Laboratory for Protected Agricultural Engineering in the Middle and Lower Reaches of Yangtze River, Ministry of Agriculture and Rural Affairs, Nanjing 210014, China | |
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| Abstract: |
| This study evaluates the impact of a side-vent(SV)negative pressure ventilation system of six-stage management on the environmental quality and emissions of ammonia(NH3)and greenhouse gases(GHGs)in an enclosed pig house during winter. Temperature, relative humidity, and air velocity data were obtained inside and outside of the pig house, and the barn ventilation rates were measured using the moisture(H2O)balance equation at inlets and outlets at six stages. In addition, air samples were obtained from the inlets and outlets of the pig house to measure GHG concentrations using a custom-made multiplexer gas sampling system equipped with an INNOVA 1412 monitor. The analysis showed that the average air temperature and relative humidity inside the pig house were 13.7℃ and 69.7%, respectively. The difference between maximum and minimum temperature and relative humidity was 3.2℃ and 39.6% in pig house. The moisture balance ventilation rate of the pig house was 6 207 m3·h-1, whereas the ventilation rate of a single pig was 24.9 m3·h-1. The air velocity inside the pig house was 0.28 m·s-1. The gas concentrations inside the pig house in winter were 8.42~15.63 mg·m-3 for NH3, 2 509~5 303 mg·m-3 for carbon dioxide(CO2), and 1.11~5.90 mg·m-3 for methane(CH4). The average emission rates of a single pig based on hourly means were 250.0 mg·h-1 for NH3, 79.9 g·h-1 for CO2, and 57.7 mg·h-1 for CH4, whereas the cumulative daily emissions were 6.0 g·d-1, 1.92 kg·d-1 and 1.39 g·d-1, respectively. No emission of nitrous oxide(N2O)was observed. Therefore, ventilation management has a significant impact on the emissions of NH3 and CO2. No significant difference in CH4 emissions are noted among the different ventilation stages. |
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