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目的为了了解生活热水军团菌污染状况,寻找重点污染环节,推测可能污染原因,为预防控制生活热水军团菌污染提供科学依据,特开展此次研究。方法选择北京市5家三星级以上宾馆饭店进行基本情况调查,采集生活热水,进行实验室军团菌病原学检测,同时测定水温。结果所调查的5家宾馆饭店中有2家检出军团菌,76份水样中有5份阳性水样,阳性率为6.58%,混水罐、储水容器和末梢水三个环节有检出,阳性率分别为25.00%、33.33%和4.35%,三者之间无明显差异。三个环节未放水条件下的阳性率高于放水后的阳性率。结论生活热水存在军团菌的污染,并且在混水罐、储水容器和末梢水三个环节有阳性检出,初步推断其为重点污染环节,并受水温、供水结构、以及采水方式等因素的影响。建议今后重点加强关键环节的日常管理,消除污染隐患。
Objective To understand the status of Legionella pneumophila in domestic hot water, find out the key pollution links, speculate the causes of possible pollution and provide a scientific basis for the prevention and control of Legionella contamination in domestic hot water. Methods Five hotels in Beijing were selected to investigate the basic situation, collect domestic hot water, conduct etiological detection of Legionella in laboratory, and determine water temperature at the same time. Results Two of the five hotels and restaurants surveyed detected Legionella and five of 76 water samples were positive, with a positive rate of 6.58%. There were three aspects of mixing water tank, water storage container and peripheral water The positive rates were 25.00%, 33.33% and 4.35% respectively, with no significant difference among the three. The positive rate of the three links without water was higher than the positive rate after the water was discharged. Conclusion There is Legionella contamination in domestic hot water and positive detection in mixing tank, water storage container and peripheral water, and it is preliminarily concluded that it is the key pollution link and affected by water temperature, water supply structure and water harvesting method The impact of factors. It is suggested that the daily management of key links should be strengthened in the future so as to eliminate potential pollution risks.