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Evaluation of bio-aerosols at an animal feed manufacturing industry: A case study

机译：动物饲料制造业中生物气溶胶的评估：一个案例研究

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Both total and biological particles (total culturable bacteria, Gram negative bacteria, mold and actinomycetes) were measured at an animal feed manufacturing industry. Suspended particle concentration ranged from 1.72 to 2.3 mg m~(-3) with a mean value of 1:97 mg m~(-3). Airborne microorganisms were detected in lower concentrations than those associated with suspended dust and feed-materials. Bacterial concentrations were two to three times higher than concentrations of mold and actinomycetes. Bacterial concentrations averaged 4.86 x 10~3 cfu m~(-3); 2.6 x 10~4 cfu m~(-3) and 3.96 x 10~7 cfu g~(-1) in air, associated with suspended dust and feed-materials, respectively, whereas mold concentrations averaged 7.33 x 10~2 cfu m~(-3); 1.97 x 10~3 cfu m~(-3) and 7 x 10~5 cfu g~(-1) of the corresponding environments, respectively. Enterobacter spp and Klebsiella spp were the most abundant Gram negative bacteria, whereas Bacillus species were the most dominant Gram positive bacteria. Aspergllius niger, other Aspergillus species and Penicillium were the dominant mold isolates. Acremonium was only detected in feed materials, whereas Aspergillus fumigatus was only detected in air. The animal feed industry environment has a significant bio-contamination and many of microorganisms implicated in respiratory problems were detected in this environment.
机译：在动物饲料制造行业中测量了总颗粒和生物颗粒（可培养细菌总数，革兰氏阴性细菌，霉菌和放线菌）。悬浮颗粒浓度范围为1.72至2.3 mg m〜（-3），平均值为1:97 mg m〜（-3）。空气中微生物的浓度低于悬浮粉尘和饲料原料。细菌的浓度比霉菌和放线菌的浓度高两到三倍。细菌平均浓度为4.86 x 10〜3 cfu m〜（-3）；空气中的2.6 x 10〜4 cfu m〜（-3）和3.96 x 10〜7 cfu g〜（-1），分别与悬浮粉尘和进料相关，而霉菌的平均浓度为7.33 x 10〜2 cfu m〜（-3） 〜（-3）;对应环境分别为1.97 x 10〜3 cfu m〜（-1）和7 x 10〜5 cfu g〜（-1）。肠杆菌属和克雷伯菌属是最丰富的革兰氏阴性菌，而芽孢杆菌属是最主要的革兰氏阳性菌。黑曲霉，其他曲霉和青霉菌是主要的霉菌分离株。仅在饲料原料中检测到顶头孢霉，而仅在空气中检测到烟曲霉。动物饲料工业环境具有严重的生物污染，在此环境中检测到许多与呼吸系统疾病有关的微生物。

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