Iervolino Matteo, Mancini Benedetta, Cristino Sandra
Department of Biological, Geological and Environmental Sciences, BiGeA, University of Bologna, via San Giacomo 12, 40126 Bologna, Italy.
Int J Environ Res Public Health. 2017 Sep 26;14(10):1125. doi: 10.3390/ijerph14101125.
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 colonization in an industrial Cooling Tower System (CTS). Environmental monitoring of , , 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). . 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 ( < 0.05) in concentration (1.77 Log cfu/L). The same trend was observed for . (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 risk for public health.
工业冷却塔的污染已被确认为军团病的一个病因，但实际风险一直被低估。在一个工业冷却塔系统（CTS）中，对两种不同的消毒处理方法在菌落定植方面进行了测试。于2016年6月至10月对嗜肺军团菌、其他军团菌血清型以及36℃下的异养菌平板计数（HPC）进行了环境监测。所采用的消毒程序基于过氧化氢（H₂O₂）和银盐（Ag⁺），此外还有抗藻处理，接着采用高浓度氯化作为冲击处理，然后用次氯酸钠（NaClO）进行连续处理。在CTS注水后，发现嗜肺军团菌血清型8的浓度为5.06 Log cfu/L；由H₂O₂/Ag⁺进行的冲击处理使污染迅速增加至6.14 Log cfu/L。CTS活动停止，随后使用NaClO进行了两次冲击处理，接着进行连续高浓度氯化处理。这些程序显示嗜肺军团菌浓度显著下降（P<0.05）（降至1.77 Log cfu/L）。在36℃下，其他军团菌血清型（降至0.55 Log cfu/100 mL）和HPC（降至1.95 Log cfu/mL）也观察到了相同趋势。环境监测以及采用包括防垢处理、物理、化学和微生物控制在内的维护程序，可确保CTS的良好性能，降低对公众健康的军团菌风险。
