医院中央空调循环水系统生物膜检测及控制措施

目的了解新型综合性处理方案对中央空调循环水处理的效果,并与原有的水处理方案进行对比,以便采用更有效的措施从源头预防和控制医院感染的发生。方法采用两种水处理方案后,应用在线微生物分析仪和生物膜测试盒进行生物膜动态趋势检测以及微生物和腐蚀速率的测定。结果经检测,原方案处理后,中央空调循环水中的生物膜趋势值一直比较高,维持在200~250之间;循环冷却水中存在致病菌(铜绿假单胞菌);系统腐蚀检测发现试片严重腐蚀。新方案处理后,中央空调循环水中的生物膜趋势值持续下降并最终稳定在20以下;6 d后水系统中致病菌消失,与生物膜趋势值相对应;试片轻微腐蚀,腐蚀速率0.075 mm/a。结论新型综合性处理方案对减少和控制致病菌、生物膜生长及腐蚀性均有确切效果。

Detection of biofilm and control measures for circulating water system of central air conditioning in hospital

ObjectiveTo investigate the effect of new comprehensive treatment scheme on the treatment of central air conditioning circulating water, and compared with the original treatment scheme, so as to take more effective measures to prevent and control the source of healthcare associated infection.MethodsAfter the implementation of two water treatment schemes, biofilm dynamic trend, microorganisms, and corrosion rate were detected by online microbial analyzer and biofilm detection kit. ResultsAfter the implementation of original scheme, biofilm trend value of central air conditioning circulating water was continuously high, maintaining at 200-500; pathogens (Pseudomonas aeruginosa) existed in the circulating cooling water; corrosion testing showed that corrosion coupons were severely corroded. After the implementation of new scheme, biofilm trend value declined continuously, and finally stably maintained below 20; pathogens were not detected after 6 days, which was corresponded to biofilm trend value; corrosion coupons were slightly corroded，corrosion rate was＜0.075 mm/a. ConclusionNew comprehensive treatment scheme is definitely effective for reducing and controlling the growth of pathogens, biofilm and corrosion.