喷嘴喷雾产生的水气溶胶空间分布的数值模拟及喷雾场景中与嗜肺军团菌相关的健康风险
Numerical simulation for spatial distribution of water aerosol produced from nozzle spray and health risk related to Legionella pneumophila in spray scenarios.
机构信息
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; International Science and Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Key Lab of Northwest Water Resource, Environment and Ecology, Ministry of Education, Xi'an University of Architecture and Technology, Xi'an, 710055, China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; International Science and Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, Xi'an, 710055, China.
出版信息
Water Res. 2022 Jun 1;216:118304. doi: 10.1016/j.watres.2022.118304. Epub 2022 Mar 16.
Water spray facilities are widely used in public places for sprinkling or beautifying the environment. However, the potential health risk induced by water aerosols increasingly calls for attention. In this study, the spatial distribution of water aerosols was investigated through the molecular sieve adsorption method, and predicted by discrete phase model (DPM). On this basis, the health risk regarding Legionella pneumophila for specific spray scenarios was evaluated by quantitative microbial risk assessment (QMRA). The results showed that the original droplet size can be described by the Rosin_Rommaler distribution (R>0.99). The spatial distribution of water aerosols produced from a nozzle spray can be well predicted by the DPM. The concentration of water aerosols showed a sharp decline within 5 m from the nozzle and was not significantly different within 5 m (p>0.05) as for various spray scenarios. However, the difference was significant outside 5 m (p<0.05). Furthermore, a safe contact distance of exceeding 8 m is proposed in spray scenarios considering the risk threshold of 0.0001. Sensitivity analysis demonstrated the concentration of Legionella pneumophila in water aerosols as the critical factor affecting the health risk.
水喷雾设施广泛应用于公共场所，用于喷洒或美化环境。然而，水气溶胶带来的潜在健康风险日益受到关注。本研究采用分子筛吸附法对水气溶胶的空间分布进行了调查，并采用离散相模型（DPM）进行了预测。在此基础上，通过定量微生物风险评估（QMRA）对特定喷雾场景下嗜肺军团菌的健康风险进行了评估。结果表明，原始液滴尺寸可以用 Rosin_Rommaler 分布来描述（R>0.99）。喷嘴喷雾产生的水气溶胶的空间分布可以通过 DPM 很好地预测。在 5m 范围内，水气溶胶的浓度迅速下降，且在各种喷雾场景下，5m 范围内的浓度差异无统计学意义（p>0.05）。然而，在 5m 以外，浓度差异有统计学意义（p<0.05）。此外，考虑到风险阈值为 0.0001，提出了在喷雾场景中超过 8m 的安全接触距离。敏感性分析表明，水气溶胶中嗜肺军团菌的浓度是影响健康风险的关键因素。
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