Diurnal variation of airborne microorganism and dust concentration in winter piggery and effects of fresh air system on them

doi:10.14088/j.cnki.issn0439-8114.2019.22.038

Abstract

Abstract: In order to understand the changes of harmful substances in the air of the piggery in one day in winter, the airborne airborne air in the ordinary closed piggery was explored by detecting the concentration of harmful substances in the piggery in the winter day and the concentration change in the short time after running the fresh air system. The daily variation of the concentration of harmful substances and the impact of the fresh air system on the micro-environment of the piggery. The results showed that the peak concentration of dust within one day in the closed piggery appeared between 7：00 and 9：00, and the minimum appeared at 19：00. The number of airborne aerobic bacteria and the number of airborne E. coli showed a trend of high early and late, low at noon. After running the fresh air system, the concentration of airborne aerobic bacteria and airborne E. coli in the piggery was not obvious, but the dust content gradually decreased, and reached the lowest value at 3 h. The concentration of PM1, PM2.5, RESP, PM10, and TSP at 0.3 m decreased by 67.65%,67.31%,67.86%,71.43% and 72.84% （P<0.05）. The concentration of PM1,PM2.5,RESP,PM10 and TSP at 1.5 m decreased by 60.87%, 61.05%,61.90%,62.76% and 60.90%（P<0.05）. The fresh air system can effectively reduce the dust concentration in the closed piggery in a short time, but the effect of reducing the airborne microorganisms in a short time was not obvious.

Key words: piggery, airborne microorganism, daily change, fresh air system, winter

CLC Number:

S828

HUANG Cang-yu, XU Zi-wei. Diurnal variation of airborne microorganism and dust concentration in winter piggery and effects of fresh air system on them[J]. HUBEI AGRICULTURAL SCIENCES, 2019, 58(22): 158-162.

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