Effects of ultraviolet germicidal irradiation and swirling motion on airborne Staphylococcus aureus, Pseudomonas aeruginosa and Legionella pneumophila under various relative humidities

被引：35
作者：
Chang, C. -W. [1 ,2 ,3 ]
Li, S. -Y. [1 ]
Huang, S. -H. [4 ]
Huang, C. -K. [5 ]
Chen, Y. -Y. [5 ]
Chen, C. -C. [4 ]
机构：
[1] Natl Taiwan Univ, Inst Environm Hlth, Coll Publ Hlth, Taipei 10764, Taiwan
[2] Natl Taiwan Univ, Ctr Res Environm & Occupat Hlth, Taipei 10764, Taiwan
[3] Natl Taiwan Univ, Res Ctr Genes Environm & Human Hlth, Taipei 10764, Taiwan
[4] Natl Taiwan Univ, Coll Publ Hlth, Inst Occupat Med & Ind Hyg, Taipei 10764, Taiwan
[5] Natl Taiwan Univ, Dept Bioind Mechatron Engn, Taipei 10764, Taiwan
来源：
INDOOR AIR | 2013年 / 23卷 / 01期
关键词：
Staphylococcus aureus; Pseudomonas aeruginosa; Legionella pneumophila; ultraviolet germicidal irradiation; swirling motion; relative humidity; MYCOBACTERIUM-BOVIS BCG; CYSTIC-FIBROSIS; LEGIONNAIRES-DISEASE; INDUCED INACTIVATION; AEROSOL COLLECTION; AIR CLEANERS; WATER; CONTAMINATION; BACTERIA; MICROORGANISMS;
D O I：
10.1111/j.1600-0668.2012.00793.x
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Staphylococcus aureus, Pseudomonas aeruginosa, and Legionella pneumophila have been detected in indoor air and linked to human infection. It is essential to adopt control methods to inactivate airborne pathogens. By passing bioaerosols horizontally into a UV device at two flow rates (Qs) and moving cells around a central UVC lamp at relative humidity (RH) of 12.716.7%, 58.759.6%, and 87.390%, the effects of swirling motion and 254-nm ultraviolet germicidal irradiation (UVGI) against bioaerosols were assessed under UV-off and UV-on settings, respectively. An inverse relationship between RH and UVGI effectiveness was observed for every test bioaerosol (r = -0.74 -0.81, P < 0.0001). Increased UV resistance with RH is likely associated with the hygroscopicity of bioaerosols, evident by increased aerodynamic diameters at high RH (P < 0.05). UVGI effectiveness was significantly increased with decreasing Q (P < 0.0001). Moreover, P. aeruginosa was the most susceptible to UVGI, while the greatest UV resistance occurred in L. pneumophila at low RH and S. aureus at medium and high RH (P < 0.05). Results of UV off show P. aeruginosa and L. pneumophila were more sensitive to air-swirling motion than S. aureus (P < 0.05). Overall, test bioaerosols were reduced by 1.74.9 and 0.21.7 log units because of the UVGI and swirling movement, respectively. Practical Implications The studied UV device, with a combination of swirling motion and UVGI, is effective to inactivate airborne S. aureus, P. aeruginosa, and L. pneumophila. This study also explores the factors governing the UVGI and swirling motion against infectious bioaerosols. With understanding the environmental and operational parameters, the studied UV device has the potential to be installed indoors where people are simultaneously present, for example, hospital wards and nursing homes, to prevent the humans from acquiring infectious diseases.
引用
收藏
页码：74 / 84
页数：11
相关论文
共 31 条
[1]   AEROSOLS CONTAINING LEGIONELLA-PNEUMOPHILA GENERATED BY SHOWER HEADS AND HOT-WATER FAUCETS [J].
BOLLIN, GE ;
PLOUFFE, JF ;
PARA, MF ;
HACKMAN, B .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1985, 50 (05) :1128-1131
[2]   EVALUATION OF 4 AEROBIOLOGICAL SAMPLING METHODS FOR THE RETRIEVAL OF AEROSOLIZED PSEUDOMONAS-SYRINGAE [J].
BUTTNER, MP ;
STETZENBACH, LD .
APPLIED AND ENVIRONMENTAL MICROBIOLOGY, 1991, 57 (04) :1268-1270
[3]   Evaluation of bioaerosol sampling techniques for Legionella pneumophila coupled with culture assay and quantitative PCR [J].
Chang, Ching-Wen ;
Chou, Fang-Chen ;
Hung, Pei-Yu .
JOURNAL OF AEROSOL SCIENCE, 2010, 41 (12) :1055-1065
[4]   Correlation between Legionella contamination in water and surrounding air [J].
Crimi, Paolo ;
Macrina, Gianni ;
Grieco, Antonio ;
Tinteri, Carola ;
Copello, Laura ;
Rebora, Daniela ;
Galli, Angelo ;
Rizzetto, Rolando .
INFECTION CONTROL AND HOSPITAL EPIDEMIOLOGY, 2006, 27 (07) :771-773
[5]  
Deloge-Abarkan M, 2007, J ENVIRON MONITOR, V9, P91, DOI [10.1039/b610737k, 10.1039/B610737K]
[6]  
Ding P. H., 1997, J AEROSOL SCI, V28, P671
[7]   Bacterial contamination in the environment of hospitalised children with cystic fibrosis [J].
Ferroni, Agnes ;
Werkhauser-Bertrand, Aurelie ;
Bourgeois, Muriel Le ;
Beauvais, Raphaelle ;
Vrielynck, Stephanie ;
Durand, Christelle ;
Lenoir, Gerard ;
Berche, Patrick ;
Sermet-Gaudelus, Isabelle .
JOURNAL OF CYSTIC FIBROSIS, 2008, 7 (06) :477-482
[8]  
Fields B. S., 1997, Manual of environmental microbiology., P666
[9]   Numerical analysis for evaluating the "Exposure Reduction Effectiveness" of room air cleaners [J].
Gao, Zhi ;
Zhang, J. S. .
BUILDING AND ENVIRONMENT, 2010, 45 (09) :1984-1992
[10]   Influence of relative humidity on particle size and UV sensitivity of Serratia marcescens and Mycobacterium bovis BCG aerosols [J].
Ko, G ;
First, MW ;
Burge, HA .
TUBERCLE AND LUNG DISEASE, 2000, 80 (4-5) :217-228
1234