Hsu Ching-Shan, Lu Ming-Chun, Huang Da-Ji
Department of Environmental Resource Management, Chia-Nan University of Pharmacy and Science, Tainan, 71710, Taiwan,
Environ Monit Assess. 2015 Feb;187(2):17. doi: 10.1007/s10661-014-4235-2. Epub 2015 Jan 28.
As with all indoor public spaces in Taiwan, the stack rooms in public libraries should meet the air quality guidelines laid down by the Taiwan Environmental Protection Administration. Accordingly, utilizing a university library in Taiwan for experimental purposes, this study investigates the efficiency of gaseous chlorine dioxide (ClO2) as a disinfection agent when applied using three different treatment modes, namely a single-daily disinfection mode (SIM), a twice-daily disinfection mode (TWM), and a triple-daily disinfection mode (TRM). For each treatment mode, the ClO2 is applied using an ultrasonic aerosol device and is performed both under natural lighting conditions and under artificial lighting conditions. The indoor air quality is evaluated before and after each treatment session by measuring the bioaerosol levels of bacteria and fungi. The results show that for all three disinfection modes, the application of ClO2 reduces the indoor bacteria and fungi concentrations to levels lower than those specified by the Taiwan EPA (i.e., bacteria <1500 CFU/m(3), fungi <1000 CFU/m(3)), irrespective of the lighting conditions under which the disinfection process is performed. For each disinfection mode, a better disinfection efficiency is obtained under natural lighting conditions since ClO2 readily decomposes under strong luminance levels. Among the three treatment modes, the disinfection efficiencies of the TWM and TRM modes are very similar under natural lighting conditions and are significantly better than that of the SIM mode. Thus, overall, the results suggest that the TWM treatment protocol represents the most cost-effective and efficient method for meeting the indoor air quality requirements of the Taiwan EPA.
与台湾所有室内公共场所一样，公共图书馆的书库应符合台湾环境保护署制定的空气质量准则。因此，本研究以台湾一所大学图书馆为实验对象，调查气态二氧化氯（ClO2）在三种不同处理模式下作为消毒剂的使用效率，这三种模式分别是每日单次消毒模式（SIM）、每日两次消毒模式（TWM）和每日三次消毒模式（TRM）。对于每种处理模式，使用超声波雾化装置施加ClO2，并分别在自然光照条件和人工光照条件下进行。在每次处理前后，通过测量细菌和真菌的生物气溶胶水平来评估室内空气质量。结果表明，对于所有三种消毒模式，无论消毒过程是在何种光照条件下进行，ClO2的应用都能将室内细菌和真菌浓度降低到低于台湾环保署规定的水平（即细菌<1500 CFU/m³，真菌<1000 CFU/m³）。对于每种消毒模式，在自然光照条件下可获得更好的消毒效率，因为ClO2在强光下容易分解。在三种处理模式中，TWM和TRM模式在自然光照条件下的消毒效率非常相似，且显著优于SIM模式。因此，总体而言，结果表明TWM处理方案是满足台湾环保署室内空气质量要求的最具成本效益和效率的方法。
