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Disinfection performance of chlorine dioxide gas at ultra-low concentrations and the decay rules under different environmental factors
Journal of the Air & Waste Management Association ( IF 2.1 ) Pub Date : 2020-05-15
Peiyong Ning, Dan Shan, Enlv Hong, Lumin Liu, Yun Zhu, Runmeng Cui, Yuhui Zhou, Baiqi Wang

Gaseous chlorine dioxide (ClO2) is one of the most promising air disinfectants. In this study, an ultra-low concentration of ClO2 gas (< 1.2 mg/m3) was generated in an office at various levels of humidity and illuminance to investigate the decay law. The disinfection efficiency and metal corrosiveness of ultra-low concentrations of ClO2 gas were also studied using an experimental chamber. At 48% and 75% humidity, the decay rate constants of ClO2 gas were 0.0034 min−1 and 0.0036 min−1, respectively. The rate of decline of the ClO2 concentration increased as the humidity of the environment increased. The decay rate constant of ClO2 gas at an illuminance of 76 lux and 3429 lux was 0.0034 min−1 and 0.00427 min−1, respectively; hence, the decay rate increased with increased illumination. At a humidity of 72% and illuminance of 2112 lux, the decay rate constant reached 0.00880 min−1. The effects of humidity and illuminance on the attenuation of the ClO2 concentration were strongly synergistic. When the gas concentration was maintained below 0.9 mg/m3, the disinfection rate of ClO2 on bacteria (P. aeruginosa, V. mimicus and S. aureus) exceeded 99.9%; thus, ClO2 gas exhibited a high disinfection efficiency. In addition, there was no corrosion to various metals by ClO2 under the same conditions. Consequently, gaseous ClO2 at ultra-low concentrations has a high sterilisation efficiency and is non-corrosive to metals.



中文翻译:

不同环境因素下超低浓度二氧化氯气体的消毒性能及衰减规律

气态二氧化氯(ClO 2)是最有前途的空气消毒剂之一。在这项研究中,在不同湿度和照度的办公室中,产生了超低浓度的ClO 2气体(<1.2 mg / m 3),以研究衰减规律。还使用实验箱研究了超低浓度ClO 2气体的消毒效率和金属腐蚀性。在湿度为48%和75%时,ClO 2气体的衰减速率常数分别为0.0034 min -1和0.0036 min -1。ClO 2浓度的下降率随着环境湿度的增加而增加。ClO的衰减率常数2种气体在76 lux和3429 lux的照度下分别为0.0034 min -1和0.00427 min -1;因此,衰减率随照明度的增加而增加。在72%的湿度和2112 lux的照度下,衰减率常数达到0.00880 min -1。湿度和照度对ClO 2浓度衰减的影响具有强烈的协同作用。当气体浓度保持在0.9 mg / m 3以下时,ClO 2对细菌(铜绿假单胞菌,拟南芥假单胞菌金黄色葡萄球菌)的消毒率超过99.9%;因此,ClO 2气体具有较高的消毒效率。另外,在相同条件下,ClO 2不会腐蚀各种金属。因此,超低浓度的气态ClO 2具有高的杀菌效率并且对金属没有腐蚀性。

更新日期:2020-05-15
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