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Evaluation of cold plasma inactivation efficacy against different airborne bacteria in ventilation duct flow

机译：评估冷风等离子体对通风管道中不同空气传播细菌的灭活效果

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A full-size, experimental, ventilation ductwork was designed and set up to measure one-pass inactivation efficacies of a cold plasma installation under various practical environmental conditions. Five types of microorganisms, which are commonly associated with nosocomial infection, including Escherichia coli, Pseudomonas alcaligenes, Staphylococcus epidermidis, Micrococcus luteus and Serratia marcescens, were chosen and tests were conducted at four airstream velocities, ranging from 2 to 7 m/s, and two different relative humidity (R.H.) levels. The inactivation efficacies for the first three types of bacteria varied from 20% to 70%. It is interesting to note that the inactivation efficacy increased with velocity. No detectable inactivation effect was found for M. luteus and S. marcescens. The inactivation efficacy at 90% R.H. dropped to 10% of the value measured at 55% R.H. The negative ion intensities measured near the plasma installation were correlated with the airstream velocities. When compared with data from systems using conventional fibrous filters, the pressure drop measured across the plasma unit was very small. Our experiments showed that cold plasma technology has high potential to be used as an energy-efficient method for disinfection. Limitations of application are also discussed. (C) 2015 Elsevier Ltd. All rights reserved.
机译：设计并设置了一个完整的实验通风管道，以测量各种实际环境条件下冷等离子体装置的单程灭活效率。选择了五种通常与医院感染有关的微生物，包括大肠埃希菌，产假单胞菌，表皮葡萄球菌，黄褐微球菌和粘质沙雷氏菌，并在从2到7 m / s的四个气流速度下进行了测试。两种不同的相对湿度（RH）。前三种细菌的灭活效率从20％到70％不等。有趣的是，灭活功效随速度增加而增加。没有发现可检测到的黄褐线虫和marcescens的灭活作用。在90％相对湿度下的灭活效率降至在55％相对湿度下测得的值的10％。在等离子体装置附近测得的负离子强度与气流速度相关。当与使用常规纤维过滤器的系统的数据进行比较时，在等离子体单元上测得的压降非常小。我们的实验表明，冷等离子体技术具有很高的潜力，可以用作一种节能的消毒方法。还讨论了应用程序的局限性。 （C）2015 Elsevier Ltd.保留所有权利。

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