Comparison of Continuous Versus Pulsed Ultraviolet Light Emitting Diode Use for the Inactivation of Bacillus globigii Spores

Details

• Personal Author:
  Grimaila MR ; Harper WF ; Miller M ; Racz L ; Tran T
• Description:
  Light emitting diodes (LEDs) in the ultraviolet (UV) range offer a promising alternative for the disinfection of water. LEDs have many advantages over conventional UV lamps but there are concerns related to the operating life of the LED lamps. In this project Bacillus globigii was inactivated using UV LED technology. The experimental strategy included using pulsed ultraviolet (PUV) output rather than continuous UV (CUV) current in order to reduce the power requirements and extend the life of the lamps. The kinetic profiles for CUV experiments reached 6-log inactivation faster than PUV at 9.1% duty cycle (approx. 840 vs. 5,000 s) but the PUV required lower fluence (365 vs. 665 J/m2). In addition, the inactivation rate constants associated with PUV were generally higher than those of CUV (4.6-5.1 vs. 3.6-4.4 m2/J), which supports the notion that high energy bursts are more effective at causing cellular damage. Multi-target kinetics applied to most of the kinetic observations and tailing effects were generally observed. PUV LED appears to have potential to extend the lifetime of the LEDs for inactivation of spore-forming pathogens. [Description provided by NIOSH]
• Subjects:
  Disinfectants Electricity Occupational Health Safety
• Keywords:
  Author Keywords: Bacillus Globigii Cell Function Cellular Effects Cellular Function Disinfection Electrical Fields Electrical Properties Kinetics Light Emitting Diodes (LEDs) Ultraviolet Light UV Light Water Treatment

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• ISSN:
  0273-1223
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  70
• Issue:
  9
• NIOSHTIC Number:
  nn:20050094
• Citation:
  Water Sci Technol 2014 Nov; 70(9):1473-1480
• Federal Fiscal Year:
  2015
• Performing Organization:
  University of Cincinnati
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  Water Science and Technology
• End Date:
  20260630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:0918feb58a896a3b30752875913f9a714da264deac41f4b8320a0aec1d877d029fd09b5d67a0afe2a63343a99df6d3dd18e722ba8d62e0af33ec8721bd5384d3
• Download URL:
  https://stacks.cdc.gov/view/cdc/210593/cdc_210593_DS1.pdf
• File Type:
  [PDF - 9.55 MB ]