Inactivation of Airborne Microorganisms Using Novel Ultraviolet Radiation Sources in Reflective Flow-Through Control Devices

Details

• Personal Author:
  Clements N ; Hernandez M ; McCabe K ; Miller SL ; Ryan K
• Description:
  The goal of this study was to design, test, and model cylindrical flow-through control devices used to inactivate airborne microorganisms with non-mercury radiation sources and a reflective coating, through a broad relative humidity (RH) range. Bench-scale tests determined the effectiveness of three different UV-C sources-light emitting diode (LED), xenon, and mercury. In addition to measurements, modeling was performed that combined photon tracing, computational fluid dynamics, and particle tracking to predict the effectiveness of the respective UV challenges. Regardless of device configuration, UV-induced inactivation of airborne Bacillus subtilis and Mycobacterium parafortuitum was markedly sensitive to low humidity (15% RH). Actinometry measurements determined that a high reflectance wall coating increased the fluence rate by a factor of 1.6. Predictions of inactivation effectiveness using this hybrid model were in good agreement with experimental observations with errors of less than 15%. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Communicable Diseases Humidity Microbiology Occupational Health Safety
• Keywords:
  Airborne Particles Bacteria Bioaerosols Infection Control Infectious Agents Microorganisms Ultraviolet Radiation
• ISSN:
  0278-6826
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Colorado ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  44
• Issue:
  7
• NIOSHTIC Number:
  nn:20058150
• Citation:
  Aerosol Sci Technol 2010 Jul; 44(7):541-550
• Contact Point Address:
  Shelly L. Miller, Department of Mechanical Engineering, Campus Box 427, University of Colorado at Boulder, Boulder, Colorado 80309-0427, USA
• Email:
  Shelly.miller@colorado.edu
• Federal Fiscal Year:
  2010
• NORA Priority Area:
  Agriculture, Forestry and Fishing ; Manufacturing
• Performing Organization:
  University of Colorado
• Peer Reviewed:
  True
• Start Date:
  20060915
• Source Full Name:
  Aerosol Science and Technology
• End Date:
  20110914
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0bddf5526952a17f9a20b6303bef6af12c46d79d67fbc4e973e4c82f8b7fe30232a36a00d2b09da2e6b6857f9b1c5d62067cddb68f0bd8396dc7686ed91d1a8f
• Download URL:
  https://stacks.cdc.gov/view/cdc/221290/cdc_221290_DS1.pdf
• File Type:
  [PDF - 679.34 KB ]