无锡市2009年部分冷却塔水军团菌污染状况调查

Survey on Contamination of Legionella Bacteria in Water of Cooling Towers in Wuxi in 2009

目的了解无锡市不同类型场所冷却塔水中军团菌污染状况和血清型别。方法 2009年按照无锡市地理分布抽取32家公共场所和8家工厂作为监测点,共抽取冷却塔水89份,按照卫生部《集中空调通风系统卫生规范》附录B"空调系统军团菌的检验分析方法"进行检测。结果 89份冷却塔水军团菌检出率达26.97%(24/89),阳性率以宾馆和医院为高,分别为33.33%(8/24)和33.36%(4/11)。军团菌血清型以LP1和LP6为主,分别占54.2%(13/24)和29.2%(7/24)。冷却塔水消毒与不消毒、有无藻类生长军团菌检出差异有统计学意义。结论无锡市不同场所冷却塔水中存在军团菌的污染,军团菌生长可能与冷却塔水不消毒、有藻类生长有关,可作为控制冷却水军团菌的依据。

Objective To explore the contamination status and serological typing in water of various cooling towers in Wuxi. Methods Legionella was detected in cooling water from 32 public places and 8 factories in Wuxi in 2009.There were 89 samples total.Legionella was tested according to ＂Central Air Conditioning Ventilation System Hygiene Norms of Public Health Appendix B＂. Results The detection rate of legionella in water of cooling towers was 26.97% （24/89）.The positive rate was the highest in cooling water of hotels and hospitals,which was 33.33%（8/24） and 33.36（4/11）,respectively.The Lp1 and Lp6 were the main serotypes,accounted for 54.2%（13/24）and 29.2%（7/24）,respectively.There were statistically significant differences in the positive rate of legionella between disinfected and non-disinfected water of cooling towers and between water with or without colonized algae. Conclusions The water of cooling towers in Wuxi was contaminated severely.The proliferation of legionella is presumed due to unsatisfactory disinfection and colonized algae.The results provide the evidence for control of legionella in water of cooling tower.