222 nm紫外线上层平射对北京市某三级甲等医院急诊科空气的动态消毒效果

Dynamic disinfection effect of the upper-room 222 nm ultraviolet radiation on the air in the emergency department in a tertiary general hospital in Beijing, China

  • 摘要:
    目的 评价222 nm紫外线上层平射对急诊科不同区域空气的动态消毒效果,为医疗机构有人环境的空气消毒提供新思路。
    方法 选取首都医科大学附属北京天坛医院急诊留观室、急诊计算机断层扫描(CT)室、急诊抢救室和急诊诊室等区域,在距离地面2.3~2.6 m高度安装222 nm紫外线上层平射空气消毒器。根据试验区域是否使用222 nm紫外线消毒分为222 nm紫外线组和对照组。222 nm紫外线组于8:00开始消毒,并于9:00—16:00进行空气采样,每间隔1 h采样1次,每次采集10 min;对照组不实施空气消毒,只进行与222 nm紫外线组相同方法的空气采样。使用六级筛孔撞击式空气微生物采样器进行空气采样,比较2组空气菌落总数的差异。
    结果 试验共采集空气样本128份,其中222 nm紫外线组和对照组各64份。222 nm紫外线组在急诊各试验区域的空气菌落总数均低于对照组(均P<0.001),并在全时段维持较低水平,对空气中微生物的杀灭率为55.76%~76.33%。急诊留观室、抢救室和急诊诊室9:00—16:00的空气菌落总数合格率从12.50%、37.50%和25.00%分别升高至81.25%、100.00%和100.00%(均P<0.001)。222 nm紫外线组的急诊诊室和CT室超过62.50%的时间符合Ⅰ类、Ⅱ类环境标准。
    结论 222 nm紫外线上层平射可降低急诊科空气菌落总数,改善急诊环境,持续照射有助于保持空气洁净程度。

     

    Abstract:
    Objective To evaluate the dynamic disinfection effect of the upper-room 222 nm ultraviolet radiation on the air in different areas of the emergency department, and to provide references for a new solution of air disinfection that man-machine coexisted in the medical and healthcare institutions.
    Methods The upper-room 222 nm ultraviolet radiation air sterilizers were installed at a height of 2.3‒2.6 m from the ground in the observation room, computed tomography (CT) scanning room, rescue room and consulting room of the emergency department in Beijing Tiantan Hospital, Capital Medical University. The test area was divided into a 222 nm ultraviolet group and a control group according to whether the 222 nm ultraviolet germicidal air disinfection was conducted or not. The experimental group started air disinfection at 8:00 a.m., and the air sampling was conducted from 9:00 a.m. to 16:00 p.m., with a 10 min sampling interval of every 1 hour. While the control group only collected air sample with the same air sampling method used in the experimental group, without air disinfection. The air microbial sampler with six-level sieve impingement was used for the air sampling, and the differences in the total number of airborne bacterial colonies were compared between the two groups.
    Results A total of 128 air samples were collected in the trial, of which 64 were from the experimental group and 64 from the control group. The total number of airborne bacterial colonies in the experimental group was lower than that in the control group (allP<0.001), and was maintained at a lower level throughout the entire period. The killing rate of 222 nm ultraviolet radiation to airborne microorganisms was approximately 55.76% to 76.33% in different sampling areas. The qualified rates of the total number of dynamic airborne bacterial colonies in the observation room, rescue room and consulting room were improved from 12.50%, 37.50% and 25.00% to 81.25%, 100.00% and 100.00%, respectively (allP<0.001). Over 62.50% of the time, the air quality in the consulting room and CT room in the 222 nm ultraviolet group met the environment standards for airborne bacterial colony criteria of class Ⅰ or class Ⅱ.
    Conclusion The upper-room 222 nm ultraviolet radiation germicidal disinfection can effectively reduce the total number of airborne bacterial colonies and improve the environment for emergency department, and the continuous using of it is helpful for keeping the air safe and clean.

     

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