A pilot study on the disinfection efficacy of localized UV on the flushing generated spread of pathogens
A pilot study on the disinfection efficacy of localized UV on the flushing generated spread of pathogens
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DOI：
10.1016/j.jhazmat.2018.07.003
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发表时间：
2018-09-15
影响因子：
13.6
通讯作者：
Li, W. S.
中科院分区：
文献类型：
--
作者：
Lai, A. C. K.;Nunayon, S. S.;Li, W. S.
冲洗马桶的过程可能产生与冲洗相关的水滴，这可能使人类暴露于载有病原体的气溶胶。人们对这种气溶胶传播或减少接触这些气溶胶的手段知之甚少。本研究通过对空气和表面污染物的局部消毒系统的测试，评估了紫外线波段C（UV-C）对冲洗产生的载有病原体的气溶胶的消毒效果。选择三种类型的细菌进行研究：表皮葡萄球菌、大肠杆菌和鼠伤寒沙门氏菌。用5 W和10 W的UV-C管进行测试。观察到高水平的消毒效果，从76%至97%的载菌气溶胶的排放源，和效率的53%至79%的表面样品在本地系统。从本地化系统的结果进行了进一步比较与上层室紫外线杀菌照射（UVGI）系统。值得注意的是，局部系统的紫外线-C剂量和臭氧排放量远低于现行准则建议的限值。这项研究表明，在排放源附近对冲洗产生的载有病原体的气溶胶进行消毒比在气溶胶可能散布到环境中的较远地点更有效。
The process of toilet-flushing can generate flushing-associated water droplets which can potentially expose humans to pathogen-laden aerosols. Very little is known about such aerosol dissemination or the means for minimizing exposure to these aerosols. This study has evaluated the efficacy of ultraviolet waveband C (UV-C) for disinfection of flushing-generated pathogen-laden aerosols through tests with localized disinfection systems for airborne and surface contaminations. Three types of bacteria were chosen for investigation: Staphylococcus epidermidis, Escherichia coli, and Salmonella typhimurium. Tests were conducted with UV-C tubes of 5 W and 10 W. High levels of disinfection efficacies were observed, ranging from 76% to 97% for bacteria-laden aerosols at sources of emission, and efficiencies of 53% to 79% for surface samples in localized systems. The results from the localized systems were further compared with those obtained with an upper-room ultraviolet germicidal irradiation (UVGI) system. As it is important to note, the UV-C doses and ozone emissions for the localized systems were found well below the limits recommended in current guidelines. This research has shown that the disinfection of flushing-generated pathogen-laden aerosols in proximity to the source of emission was more effective than at the more distant sites where aerosols may be dispersed to the environment.