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Drain decontamination using in-situ-generated ozone.

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A novel ozone disinfection system effectively reduces microbial contamination in sink drains, offering a safe and efficient alternative to traditional methods for healthcare settings.

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Area of Science:

  • Environmental Microbiology
  • Plasma Technology
  • Infection Control

Background:

  • Sink drains are a significant source of microbial contamination in healthcare environments.
  • Pathogen aerosolization and splashback from flowing water contribute to contamination.
  • Biofilms in drains harbor planktonic and sessile microorganisms.

Purpose of the Study:

  • To demonstrate a novel method for ozone disinfection of drains.
  • To suppress pathogen growth in drain sumps, including biofilms.
  • To utilize a portable cold plasma device for in situ ozone generation.

Main Methods:

  • Ozone was generated in situ using ambient air and a portable cold plasma device.
  • The system incorporated safety mechanisms to prevent operator ozone exposure.
  • Bacterial recovery was assessed post-treatment to quantify bioburden reduction.

Main Results:

  • Significant bioburden reduction was observed in drain biofilms (approximately 5 log10).
  • Biofilms in the sink area also showed substantial reduction (approximately 6 log10).
  • The cold plasma device safely generated highly biocidal ozone.

Conclusions:

  • Plasma-generated ozone is a safe and effective disinfectant for inaccessible drain pipework.
  • This portable system offers advantages over liquid disinfectants, reaching all surfaces.
  • Ozone disinfection is efficient, requiring minimal power and producing no toxic residues.