Emission characteristics of ammonia,hydrogen sulfide and odor concentrations in step cage-rearing layer farms
It is of profound significance to carry out research on the emission characteristics of ammonia and hydrogen sulfide in typical large-scale layer farms to improve the air quality of chicken houses,reduce pollution from poultry breeding,and control harmful gas emissions.In this paper,the concentration of ammonia,hydrogen sulfide and odor inside and outside the chicken house in winter,spring and summer of a step cage-rearing layer farm in Zhejiang Province was detected and analyzed,and the ammonia emission rate of each laying hen was calculated.The results showed that the average concentration of NH3 in different seasons was significantly different,the highest was in winter(14.46 mg·m-3),H2 S gas was detected only in winter in the chicken house,and the change law of NH3 and H2 S in different positions in the chicken house was different in different seasons,and the NH3 concentration near the entrance and exhaust outlet in winter and summer was easily affected by the air flow,and the NH3 and H2 S concentrations detected in the central area of the chicken house were more representative of the odor emission in the chicken house.Among the points outside the house,the NH3 concentration was the highest in summer except for the NH3 concentration at the air outlet of the chicken house,which was the highest in winter.The ammonia emission rates of chicken house in winter and summer were 3.09 and 18.87 mg·h-1 per chicken,the ammonia emission rate of the chicken house in summer was significantly greater than that in winter;The correlation analysis between NH3 and odor concentration showed that the Pearson correlation coefficient was 0.41,and the correlation between the two was poor.
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万方数据
