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Related Experiment Videos

Surface germicidal effects of ozone for microorganisms.

Chih-Shan Li1, Yu-Chun Wang

  • 1Graduate Institute of Environmental Health, College of Public Health, National Taiwan University, Room 1449, No. 1, Jen Ai Road, 1st Section, 100, Taipei, Taiwan, R.O.C. csli@ccms.ntu.edu.tw

AIHA Journal : a Journal for the Science of Occupational and Environmental Health and Safety
|August 12, 2003
PubMed
Summary

Ozone effectively disinfects surfaces, with efficacy varying by microorganism and increasing with humidity. Escherichia coli is most sensitive, while Bacillus subtilis spores are most resistant to ozone treatment.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Chemical Engineering

Background:

  • Surface disinfection is crucial for preventing pathogen transmission.
  • Ozone (O3) is a potent oxidizing agent with germicidal properties.
  • Understanding factors influencing ozone efficacy is vital for optimizing its use.

Purpose of the Study:

  • To evaluate the impact of microorganism species, relative humidity, and ozone dosage on surface disinfection.
  • To determine the sensitivity of different bacteria and fungi to ozone.
  • To establish the relationship between ozone dose and microbial inactivation.

Main Methods:

  • Bacterial and fungal cultures (Escherichia coli, Bacillus subtilis, Candida famata, Penicillium citrinum) were prepared on agar plates.

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  • Cultures were exposed to varying ozone concentrations and durations.
  • Microorganism survival fractions were measured to determine inactivation rates.

    • Main Results:

    • Microorganism inactivation by ozone follows an exponential relationship with ozone dosage (concentration × time).
    • Escherichia coli demonstrated the highest sensitivity, requiring low ozone doses for inactivation.
    • Bacillus subtilis spores exhibited the greatest resistance, necessitating significantly higher ozone doses.
    • Ozone's germicidal efficiency increased with rising relative humidity due to enhanced radical generation.

    Conclusions:

    • Ozone is a highly effective disinfectant for contaminated surfaces, offering a reliable safety margin.
    • Significant variations in ozone sensitivity exist among different microbial species.
    • Optimal ozone disinfection protocols should consider microbial type and environmental conditions like humidity.
    • Appropriate respiratory protection is recommended during high-concentration ozone operations to ensure worker safety.