UV air cleaners and upper-room air ultraviolet germicidal irradiation for controlling airborne bacteria and fungal spores.
In-room air cleaners (ACs) and upper-room air ultraviolet germicidal irradiation (UVGI) are engineering control technologies that can help reduce the concentrations of airborne bacteria and fungal spores in the indoor environment. This study investigated six different types of ACs and quantified the...
| Publicado en: | Journal of Occupational & Environmental Hygiene Vol. 3; no. 10; pp. 536 - 547 |
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| Autores principales: | , , , , |
| Formato: | CEU equations & formulas exam questions research tables/charts Journal Article |
| Publicado: |
Taylor & Francis Ltd
Oct2006
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=106247442&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 106247442 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 15459624 V1L jtl: Journal of Occupational & Environmental Hygiene issn: 15459624 maglogo: Y pubinfo: dt: Oct2006 vid: 3 iid: 10 pid: 377 pub: Taylor & Francis Ltd place: Philadelphia, Pennsylvania artinfo: ui: 106247442 2009298749 10.1080/15459620600909799 NLM16908454 106247442 ppf: 536 ppct: 11 formats: fmt: @attributes: type: P tig: atl: UV air cleaners and upper-room air ultraviolet germicidal irradiation for controlling airborne bacteria and fungal spores. aug: au: Kujundzic E Matalkah F Howard CJ Hernandez M Miller SL affil: Department of Civil, Environmental and Architectural Engineering, University of Colorado at Boulder, Boulder, Colorado 80309-0427, USA. shelly.miller@colorado.edu sug: subj: Spores Radiation Effects Ultraviolet Rays Ventilation Methods Aerosols Air Ionization Air Pollution, Indoor Analysis Aspergillus Physiology Comparative Studies Education, Continuing (Credit) Equipment and Supplies Equipment and Supplies Standards Funding Source Gram-Positive Bacteria Radiation Effects Infection Control Equipment and Supplies Infection Control Methods Infection Control Standards Mycobacterium Radiation Effects Sterilization and Disinfection Equipment and Supplies Sterilization and Disinfection Methods Sterilization and Disinfection Standards Ventilation Equipment and Supplies Ventilation Standards Human ab: In-room air cleaners (ACs) and upper-room air ultraviolet germicidal irradiation (UVGI) are engineering control technologies that can help reduce the concentrations of airborne bacteria and fungal spores in the indoor environment. This study investigated six different types of ACs and quantified their ability to remove and/or inactivate airborne bacteria and fungal spores. Four of the air cleaners incorporated UV lamp(s) into their flow path. In addition, the efficacy of combining ACs with upper-room air UVGI was investigated. With the ventilation system providing zero or six air changes per hour, the air cleaners were tested separately or with the upper-room air UVGI system in operation in an 87-m3 test room. Active bacteria cells and fungal spores were aerosolized into the room such that their numbers and physiologic state were comparable both with and without air cleaning and upper-room air UVGI. In addition, the disinfection performance of a UV-C lamp internal to one of the ACs was evaluated by estimating the percentage of airborne bacteria cells and fungal spores captured on the air filter medium surface that were inactivated with UV exposure. Average airborne microbial clean air delivery rates (CADRm) varied between 26-981 m3 hr-1 depending on the AC, and between 1480-2370 m3 hr-1, when using air cleaners in combination with upper-room air UVGI. Culturing, direct microscopy, and optical particle counting revealed similar CADRm. The ACs performed similarly when challenged with three different microorganisms. Testing two of the ACs showed that no additional air cleaning was provided with the operation of an internal UV-C lamp; the internal UV-C lamps, however, inactivated 75% of fungal spores and 97% of bacteria cells captured in the air filter medium within 60 min. pubtype: Academic Journal doctype: CEU equations & formulas exam questions research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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