Investigating the effect of several factors on concentrations of bioaerosols in a well-ventilated hospital environment
Investigating the effect of several factors on concentrations of bioaerosols in a well-ventilated hospital environment
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DOI：
10.1007/s10661-019-7559-0
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发表时间：
2019-07-01
影响因子：
3
通讯作者：
Shahsavani, Abbas
中科院分区：
文献类型：
--
作者：
Mousavi, Marzieh Sadat;Hadei, Mostafa;Shahsavani, Abbas
这项研究对Razavi医院（Mashhad, Iran） 9个病房的细菌和真菌生物气溶胶进行了表征和量化，该医院配备了先进的供暖、通风和空调（HVAC）系统，包括用于空气净化的HEPA过滤器。在本研究中，从夏季和秋季的上午和下午班次的多个医院病房的室内空气中采集了432个样本。采用6通道手持式粒子计数器测量粒径为> 0.3、> 0.5、>、>、>5和> 10 m的粒子数浓度。在早移和夏季观测到的生物气溶胶类型多样性更大。微生物负荷不受温度、相对湿度、工作班次、季节和访客数量的显著影响，这表明设计良好的通风系统可以有效消除场地的特定变化。对于微生物数量浓度，仅观察到直径为bbb10 m的颗粒数量与空气微生物负荷之间存在显著相关性。因此，被动取样可能不能正确反映较小的生物气溶胶的实际浓度。综上所述，HVAC系统中的HEPA过滤器成功降低了医院环境中的生物气溶胶浓度。此外，我们建议在存在功能良好的暖通空调系统的情况下使用主动采样。
This study characterized and quantified the bacterial and fungal bioaerosols in nine wards of the Razavi Hospital (Mashhad, Iran) that is equipped with an advanced heating, ventilating, and air conditioning (HVAC) system including HEPA filters for air cleaning. In this study, 432 samples were taken from the indoor air of multiple hospital wards during the morning and afternoon shifts during summer and autumn. The particle number concentrations with sizes of > 0.3, > 0.5, > 1, > 2, > 5, and > 10 m were measured using a 6-channel handheld particle counter. A greater diversity of bioaerosol types were observed during the morning shifts and during summer. The microbial load was not affected significantly by the temperature, relative humidity, working shift, season, and number of visitors, indicating the effectiveness of a well-designed ventilation system to eliminate site-specific variations. For microbial number concentrations, a significant correlation was only observed between the number of particles with a diameter of > 10 m and the airborne microbial loading. Thus, passive sampling may not properly reflect the actual concentrations of smaller bioaerosols. In conclusion, HEPA filters in the HVAC system successfully decreased the bioaerosol concentrations in the hospital environment. Additionally, we recommend that active sampling be used in cases where a well-functioning HVAC system exists.