This study was performed to investigate the distribution characteristics of airborne bacteria emitted from swine manure composting plants. The types of swine manure composting plants selected for the survey in this study were as follows: screw type, rotary type, and natural dry type. Mean levels of airborne bacteria in swine manure composting plants were 7428 (±1024) CFU m⁻³ for the screw type, 3246 (±1407) CFU m⁻³ for the rotary type, and 5232 (±1217) CFU m⁻³ for the natural dry type, respectively. Based on the results obtained from this study, the swine manure composting plant operated by screw type showed the highest concentration of airborne bacteria, followed by the natural dry type and rotary type. The monthly concentration of airborne bacteria was the highest in August and the lowest in November, regardless of the type of swine manure composting plant. The respirable size of airborne bacteria accounted for about 50% of the total. The ratio of respirable to the total quantity of airborne bacteria was 50%. The correlation relationships between airborne bacteria and environmental factors (temperature, relative humidity, particulate matters, and odor) were not found to be significant in the swine manure composting plants. The predominant genera of airborne bacteria identified were Micrococcus spp., Staphylococcus spp., Escherichia(E-coli) spp., Enterococcus spp., and Enterobacteriaceae spp.

中文翻译：

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猪粪堆肥厂空气中细菌的暴露评估

本研究旨在研究猪粪堆肥厂排放的空气传播细菌的分布特征。本次调查选取的猪粪堆肥厂类型有：螺旋式、旋转式和自然干式。猪粪堆肥厂中空气传播细菌的平均水平为螺旋式为 7428 (±1024) CFU m ^-3，旋转式为3246 (±1407) CFU m ^-3和 5232 (±1217) CFU m ^-3分别为自然干燥型。根据这项研究获得的结果，螺旋式操作的猪粪堆肥厂的空气中细菌浓度最高，其次是自然干式和旋转式。无论猪粪堆肥厂的类型如何，空气中细菌的月浓度在8月份最高，11月份最低。空气中细菌的可吸入大小约占总数的50%。可吸入细菌占空气传播细菌总量的比例为50%。空气传播细菌与环境因素（温度、相对湿度、颗粒物和气味）之间的相关关系在猪粪堆肥厂中不显着。确定的空气传播细菌的主要属是微球菌属、葡萄球菌属、埃希氏菌（大肠杆菌）属。,肠球菌属。和肠杆菌科。