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目的探讨冷却塔气溶胶中军团菌分离过程中的杂菌控制方法。方法冷却塔运行不同时间采用生物气溶胶采样器收集不同容积气溶胶样品,在不同时间段分别采用酸处理、热处理及稀释处理等方法控制杂菌。结果冷却塔运行初期,杂菌可控率在80%以上,空气采集容积在800 L以内的杂菌可控率为85.0%;在冷却塔运行﹥120 d时间段,稀释处理的杂菌可控率81.8%,空气采集容积在1 500 L以内的杂菌可控率100%;样品留置﹥15 d后,在冷却塔运行的各个时间段,用各种处理方法的杂菌可控率均为0。结论样品采集后应及时处理,并且随着冷却塔运行时间的延长,除常规酸、热处理外,应增加稀释处理。
Objective To investigate the method of controlling bacteria in Legionella isolated from the aerosol of cooling tower. Methods The aerosol sample was collected by bio-aerosol sampler at different times during cooling tower operation. The bacteria were controlled by acid treatment, heat treatment and dilution treatment at different time periods. Results In the early stage of cooling tower operation, the controlled rate of bacteria was more than 80% and the control rate of bacteria with air collection volume within 800 L was 85.0%. In the period of operation> 120 d of cooling tower, the diluted bacteria was controllable Rate of 81.8%, air collection volume of 1 500 L less than 100% of the controllable rate of bacteria; sample retention> 15 d, cooling tower operation in various periods, with a variety of treatment methods control rate of bacteria are 0. Conclusion After the sample collection should be promptly processed, and with the extension of cooling tower run time, in addition to conventional acid, heat treatment, should be added to the dilution.