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The Emission of air pollutants in fattening pig houses

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

Citation:  10th International Livestock Environment Symposium (ILES X)  .(doi:10.13031/iles.18-016)
Authors:   Shi hua Pu, Ding biao Long, hua zuo Liu
Keywords:   fattening homes; ammonia; total suspended particulate; airborne microbial colonies; the emissions law of air pollutant

Abstract. The experiment, which aims to explore the emissions of air pollutants in large-scale breeding pig houses and analyze the influence of environmental factors on the concentration of air pollutants, was conducted in a fattening pig house in the original breeding pig farm of Chongqing. The environmental parameters and pollutant concentrations were monitored for 14 consecutive days and the empirical prediction of the concentration of pollutants was modeled by using the regression analysis method. The results showed that the concentrations of air pollutants in different seasons were significantly different (P<0.05), specifically, the concentrations of NH3 and TSP in winter were significantly higher than those in summer (P<0.05), and all reached the maximum at 07:00 h; the number of microbes in winter was less than summer, but there was no significant difference between the two seasons (P>0.05). In terms of the correlation of pollutant concentration with environmental factors, there was no significant correlation with wind speed or air pressure, but the correlation with temperature and humidity was evident, and there were seasonal differences. In summer, the TSP concentration in the fattening house was negatively correlated with temperature (with correlation coefficient at -0.72), NH3 concentration and total number of airborne microbial colonies were positively correlated with temperature (with correlation coefficient at 0.58,0.79); in winter, TSP and NH3 concentrations were negatively correlated with humidity (with correlation coefficient at -0.73 and -0.66 respectively), and the total number of airborne microbial colonies was positively correlated with humidity (with correlation coefficient at 0.84). Research showed that the pollutant concentration in fattening pig houses greatly differed from seasonal variation and diurnal variation, due to the ventilation condition, temperature and humidity.

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