超声波加湿室内微生物气溶胶浓度与优化方法

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Abstract This work experimentally investigated the size-distribution and concentration changes of indoor bioaerosol before and after ultrasonic humidification via the orthogonal experiment methods in three heated experimental chambers (23℃) to clarify the exposure risk of indoor airborne bacteria and fungi during ultrasonic humidification. Effectiveness of three well-recognized influencing factors, i.e., target relative humidity (RH=40%, 55%, 70%), humidifier water type (distilled water, tap water, cooled boiled water), and window opening degree (0, 1/6, 1/3) on mitigating the exposure risks was also rated according to Range Analysis and Analytical Hierarchy Process (AHP). The results showed a substantial increase of indoor bacterial and fungal aerosol concentrations, by 294% and 798%, respectively, after ultrasonic humidification; the surged microbes were concentrated in the inhalable ranges. The three factors varied in their effectiveness in mitigating the bioaerosol exposure during humidification, which was ranked by AHP as: humidifier water quality (45%)> target relative humidity (44%)>window opening (11%). To minimize the exposure risks, distilled water and a medium humidification level (such as RH=55%) should be prioritized for ultrasonic humidification, while the effect of window opening degrees is relatively insensitive.

Key words： ultrasonic humidification bioaerosol indoor air orthogonal experiment optimization

Received: 22 September 2021

PACS:	X513
	X172

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	CHEN Lu-an
	YANG Chuan-jun
	GU Yu-qian
	LIU Xue-hu
	YANG Zi-li

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CHEN Lu-an,YANG Chuan-jun,GU Yu-qian等. Impacts of ultrasonic humification on size-distribution and concentration variations of indoor bioaerosol and its optimization strategy[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(4): 1594-1600.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I4/1594

[1]	Edwards J H. Microbial and immunological investigations and remedial action after an outbreak of humidifier fever[J]. Occupational and Environmental Medicine, 1980,37(1):55-62.
[2]	人民网.同寝室4名大学生一起出现发热不当使用加湿器得了肺炎[EB/OL].(2021-03-24)[2021-04-01]. http://health.people.com.cn/n1/2021/0324/c14739-32059080.html. People's Daily Online. 4college students in the same dormitory developed fever simultaneously, improper use of humidifier lead to pneumonia[EB/OL].(2021-03-24)[2021-04-01]. http://health.people.com.cn/n1/2021/0324/c14739-32059080.html.
[3]	央广网.女子紧闭门窗患上真菌性肺炎加湿器是"元凶"[EB/OL]. (2018-12-05)[2021-04-01]. http://health.cnr.cn/jkgdxw/20181205/t20181205_524439975.shtml. Central Broadcasting Network. The humidifier is the "culprit" of the woman suffering from fungal pneumonia with closed doors and windows[EB/OL]. (2018-12-05)[2021-04-01]. http://health.cnr.cn/jkgdxw/20181205/t20181205_524439975.shtml.
[4]	秦宏,王昌松.某电子组装车间加湿器热事件调查[J]. 环境与职业医学, 2017,34(2):165-168. Qing H, Wang C S, Investigation of an occupational humidifier fever event in an electronic assembly workshop[J]. Journal of Environmental & Occupational Medicine, 2017,34(2):165-168.
[5]	洪镭,马涛.一起车间内疑似军团菌病暴发的调查报告[J]. 职业与健康, 2013,29(23):3142-3143,3146. Hong L, Ma T. An investigation report of suspected outbreak of legionnaires' disease[J]. Occupation and Health, 2013,29(23):3142- 3143,3146.
[6]	李博,王欣,杨跃峰.一起加湿器传播病原微生物引起室内空气污染事件调查[J]. 现代预防医学, 2014,41(9):1719-1721,1725. Li B, Wang X, Yang Y F. Investigation on an indoor air pollution incident caused by pathogenic microorganism dispersed in the water fog[J]. Modern Preventive Medicine, 2014,41(9):1719-1721,1725.
[7]	Yang Z L, Chen L A, Yang C J, et al. Portable ultrasonic humidifier exacerbates indoor bioaerosol risks by raising bacterial concentrations and fueling pathogenic genera[J]. Indoor Air, 2022,32:e12964.doi:10. 1111/ina.12964.
[8]	Sain A E, Zook J, Davy B M, et al. Size and mineral composition of airborne particles generated by an ultrasonic humidifier[J]. Indoor air, 2018,28(1):80-88.
[9]	Sain A E, Dietrich A M. Emission of inhalable dissolved drinking water constituents by ultrasonic humidifiers[J]. Environ. Eng. Sci., 2015,32(12):1027-1035.
[10]	Tyndall R L, Lehman E S, Bowman E K, et al. Home humidifiers as a potential source of exposure to microbial pathogens, endotoxins, and allergens[J]. Indoor Air, 1995,5(3):171-178.
[11]	Lee J H, Ahn K H, Yu I J. Outbreak of bioaerosols with continuous use of humidifier in apartment room[J]. Toxicological Research, 2012, 28:103-106.
[12]	朱晓明.基于连续在线监测的西安市住宅室内空气品质及居民开关窗行为研究[D]. 西安:西安建筑科技大学, 2018. Zhu X M. The research of the indoor air quality and the behavior of residents' switching window in residential building in Xi'an based on continuous on online monitoring[D]. Xi'an:Xi'an University of Architecture and Technology, 2018.
[13]	张雷明.西安市居住建筑室内空气品质监测及通风控制策略研究[D]. 西安:西安建筑科技大学, 2020. Zhang L M, Indoor air quality monitoring and ventilation control strategies for residential buildings in Xi'an city[D]. Xi'an:Xi'an University of Architecture and Technology, 2020.
[14]	GB 50176-2016民用建筑热工设计规范[S]. GB 50176-2016 Thermal design code for civil building[S].
[15]	张松乐,童咏仪,姜黎,等.国产六级安德森空气微生物采样器的简化使用效果观察[J]. 中国公共卫生, 1994,10(10):454-455. Zhang S L, Tong Y Y, Jiang L, et al. Observation of simplified use effect of domestic six-stage Anderson air microbiological sampler[J]. Chinese Journal of Public Health, 1994,10(10):454-455.
[16]	双同科,田佳林,刘学,等.一种基于改进AHP的指标权重确定方法[J]. 中国西部科技, 2011,10(32):37-38. Shuang T K, Tian J L, Liu X, et al. A method for determining indicator weights based on improved AHP[J]. Science and Technology of West China, 2011,10(32):37-38.
[17]	Russell L, Use of six-stage Andersen sampler in investigating bioaerosol inhalation risks in different environments[C]. Asian Aerosol Conference. 2011.
[18]	Hung D V, Tong S, Nakano Y, et al. Measurements of particle size distributions produced by humidifiers operating in high humidity storage environments[J]. Biosystems Engineering, 2010,107(1):54- 60.
[19]	Kooij S, Astefanei A, Corthals G L, et al. Size distributions of droplets produced by ultrasonic nebulizers[J]. Sci. Rep., 2019,9(1):6128.
[20]	Yamamoto N, Bibby K, Qian J, et al. Particle-size distributions and seasonal diversity of allergenic and pathogenic fungi in outdoor air[J]. ISME J, 2012,6(10):1801-1811.
[21]	Dunklin E W, Puck T T. The lethal effect of relative humidity on air-borne bacteria[J]. The Journal of Experimental Medicine, 1948,87(2):87-101.
[22]	Feng Z, Zhou X, Xu S, et al. Impacts of humidification process on indoor thermal comfort and air quality using portable ultrasonic humidifier[J]. Building and Environment, 2018,133:62-72.
[23]	Wang Y, Chen L, Chen R, et al. Effect of relative humidity on the deposition and coagulation of aerosolized SiO2 nanoparticles[J]. Atmospheric Research, 2017,194:100-108.
[24]	Sterling E M, Arundel A, Sterling T D. Criteria for human exposure to humidity in occupied buildings[J]. ASHRAE Transactions, 1985, 91(1):611-622.
[25]	Arundel A V, Sterling E M, Biggin J H, et al. Indirect health effects of relative humidity in indoor environments[J]. Environ. Health Perspect, 1986,65:351-361.
[26]	Pitt W G, Ross S A. Ultrasound increases the rate of bacterial cell growth[J]. Biotechnol. Prog., 2003,19(3):1038-1044.
[27]	Joyce E, Al-Hashimi A, Mason T J. Assessing the effect of different ultrasonic frequencies on bacterial viability using flow cytometry[J]. J. Appl. Microbiol., 2011,110(4):862-870.
[28]	姚楚水,杨燕,丁兰英,等.超声波加湿器内水中自然菌生长情况及其对空气污染的研究[J]. 中国消毒学杂志, 2005,(4):442-444. Yao C S, Yang Y, Ding L Y, et al. Study on growth of natural bacteria in water in ultrasonic humidifier and contamination of air[J]. Chinese Journal of Disinfection, 2005,(4):442-444.
[29]	徐向前.地下水中丝状真菌生长繁殖特性及二氧化氯灭活机制[D]. 西安:西安建筑科技大学, 2018. Xu X Q. The growth and outbreak of filamentous fungi in groundwater and its inactivation using chlorine dioxide[D]. Xi'an:Xi'an University of Architecture and Technology, 2018.
[30]	Redfield A C. The biological control of chemical factors in the environment.[J]. American Scientist, 1958,46:205-221.