工业冷却塔的污染已被确定为军团菌病的原因之一,但真正的风险被低估了。在工业冷却塔系统(CTS)中对军团菌定植进行了两种不同的消毒处理。军团菌的环境监测,铜绿假单胞菌,2016年6月至10月进行36°C的异养平板计数(HPC).所采用的消毒程序是基于过氧化氢(H2O2)和银盐(Ag),除了抗藻治疗,然后使用超高压作为电击,然后用次氯酸钠(NaClO)连续处理。在CTS填充后,发现肺炎杆菌血清群8的浓度为5.06Logcfu/L;由H2O2/Ag进行的休克处理导致污染迅速增加,高达6.14Logcfu/L。停止CTS活性,随后使用NaClO进行两次休克处理,其次是持续的超支。这些程序显示军团菌浓度(1.77Logcfu/L)的显著降低(p<0.05)。铜绿假单胞菌(0.55Logcfu/100mL)和HPC(1.95Logcfu/mL)在36°C下观察到相同的趋势。环境监测和维护程序的采用,包括防垢治疗,和物理,化学,和微生物控制,确保CTS的良好性能,降低军团菌对公众健康的风险。
The contamination of industrial cooling towers has been identified as one cause of legionellosis, but the real risk has been underestimated. Two different disinfection treatments were tested on Legionella colonization in an industrial Cooling Tower System (CTS). Environmental monitoring of Legionella, P. aeruginosa, and a heterotrophic plate count (HPC) at 36 °C was performed from June to October 2016. The disinfection procedures adopted were based on hydrogen peroxide (H₂O₂) and silver salts (Ag⁺), in addition to an anti-algal treatment, then using hyperclorination as a shock, and then continuous treatment by sodium hypochlorite (NaClO). L. pneumophila serogroup 8 was found at a concentration of 5.06 Log cfu/L after the CTS filling; a shock treatment performed by H₂O₂/Ag⁺ produced a rapid increase in contamination up to 6.14 Log cfu/L. The CTS activity was stopped and two subsequent shock treatments were performed using NaClO, followed by continuous hyperclorination. These procedures showed a significant decrease (p < 0.05) in Legionella concentration (1.77 Log cfu/L). The same trend was observed for P. aeruginosa (0.55 Log cfu/100 mL) and HPC (1.95 Log cfu/mL) at 36 °C. Environmental monitoring and the adoption of maintenance procedures, including anti-scale treatment, and physical, chemical, and microbiological control, ensure the good performance of a CTS, reducing the Legionella risk for public health.