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| Characteristics of ammonia emission caused by intensive cage rearing of typical egg-laying chickens in autumn and winter in Henan Province, China |
| Received:June 04, 2023 Revised:July 21, 2023 |
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| KeyWord:egg-laying chicken coop;ammonia emission;Henan Province;autumn;winter |
| Author Name | Affiliation | | ZHANG Jie | School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Henan International Joint Laboratory of Environment and Resources, Zhengzhou University, Zhengzhou 450001, China | | ZHENG Ke | School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Henan International Joint Laboratory of Environment and Resources, Zhengzhou University, Zhengzhou 450001, China | | GUO Xiaoying | School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Henan International Joint Laboratory of Environment and Resources, Zhengzhou University, Zhengzhou 450001, China | | WAN Junfeng | School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Henan International Joint Laboratory of Environment and Resources, Zhengzhou University, Zhengzhou 450001, China | | YANG Jinghe | School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China | | WANG Yan | School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
Henan International Joint Laboratory of Environment and Resources, Zhengzhou University, Zhengzhou 450001, China |
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| Abstract: |
| To clarify the nitrogen emission characteristics of typical intensive layer hen breeding houses and provide basic data and technical support for the research on subsequent ammonia emission reduction measures, this study examined typical cage-raised layer hens in Yuzhou City, Henan Province. Taking the house as the research object, the effects of temperature and humidity in the laying hen house on the NH3 concentration in the exhaust gas outside the house was analyzed using a high-sensitivity electrochemical ammonia detection sensor during autumn and winter and employing a multi-point continuous monitoring method. In autumn, the temperature difference between day and night in the house was not obvious, with an average temperature of 24.0℃; in winter, the temperature difference between the inside and outside of the house was drastic, and the temperature in the house exhibited a large difference between day and night, with an average temperature of 21.4℃. In autumn, the humidity in the house varied greatly between day and night, with an average daily humidity of 52%; in winter, the humidity in the house showed a small difference between day and night, and the average daily humidity was 46.4%. The ammonia concentrations at the air outlet of the layer hen houses in autumn and winter ranged from 0 to 8.68 mg·m-3 and 0 to 5.4 mg·m-3, respectively. The concentration of efflux NH3 with the frequency of manure cleaning showed a periodic trend of the lowest concentration of NH3 efflux after the completion of manure cleaning and then increased with the continuous accumulation of chicken manure in the breeding house until the highest efflux concentration was reached before the next manure cleaning. It was positively correlated with the temperature and humidity inside the house. The monitoring data shows that optimizing the manure cleaning process of intensive cage-type breeding houses and precise control of temperature and humidity are currently effective ways to greatly reducing ammonia emissions. |
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