Analysis of Ozone Disinfection I: Science and Risks Behind Efficient Disinfection
Date: 2025-05-06Read: 0
Ozone (O3), as a potent oxidant, has become a popular choice for gas space disinfection due to its broad-spectrum sterilization and residue free properties. If the process control is improper, it can lead to disinfection failure, equipment corrosion, and even endanger personnel safety.
This article will comprehensively analyze the "correct opening method" of ozone disinfection from "principle" to "use".How Ozone Kills MicroorganismsOzone disinfection is generally divided intoPreparation, disinfection, and completionThree stages, as shown in the following figure:The principle of disinfection is mainly destructive oxidation, which penetrates microbial cell membranes, oxidase systems, and DNA/RNA structures to inactivate bacteria and viruses.Its killing has broad-spectrum high efficiency and good diffusion, but the killing effect is significantly affected by parameters. The specific impacts are as follows:
1. The synergistic effect of concentration and timeThe effectiveness of ozone disinfection is related to the concentration and duration of ozone exposure. For example, in the process of space disinfection, the ozone concentration needs to reach 20mg/m ³ and be maintained for 30 minutes to achieve a natural bacterial killing rate of over 90%.
2. Air humidity has a significant impact on disinfection effectiveness
When the air humidity is less than 45%, ozone has almost no bactericidal effect. The relative humidity needs to be ≥ 70% to exert the disinfection effect of ozone and achieve 95% efficiency. Cleanrooms typically have a humidity of ≤ 60%. Failure to humidify during disinfection may result in disinfection failure.
3. The influence of temperature on disinfection effectiveness
Low temperature can enhance the solubility of ozone and improve its disinfection effect, while high temperature can accelerate its decomposition, resulting in limited disinfection effect.The requirements for disinfection parameters in relevant standards are shown in the following table:
Table 1: Requirements for standard parameters related to ozone disinfection
risk prevention and controlStrictly verify parameters:Determine the optimal Ct value through microbial challenge experiments and optimize the plan based on temperature and humidity conditions.Strengthen monitoring and maintenance:Use online concentration and humidity monitoring devices, regularly calibrate equipment and check sealing.Environmental adaptability adjustment:Dynamically adjust the ozone dosage and contact time for different scenarios (such as air, object surfaces, etc.).Security protection:Ensure that personnel evacuate during disinfection and only enter when the residual concentration of ozone is ≤ 0.2mg/m ³.Microbial Challenge SolutionIn response to the requirements of GB 28232-2020 "Hygiene Requirements for Ozone Disinfectors" and "Technical Specifications for Disinfection" (2002 edition) for the identification of air disinfection effectiveness, our company has launchedGP3-8032 gas sterilization biological indicator using Staphylococcus aureus 8032 as the indicator strain.In addition, in response to the requirements for disinfection of medical devices and supplies in GB 28232-2020 "Hygiene Requirements for Ozone Disinfectors", our company also hasGP3-9372 and GP6-9372 gas sterilization biological indicators using ATCC 9372 as indicator strainsCan be used for gas sterilization microbial challenge.
Product features and advantages●The testing process does not require unpacking, avoiding contamination and disinfection of the environment, and is easy to operate
●Can be stored for a long time and meet the requirements for sterilization
●Corresponding indicators can be selected for different ozone disinfection conditions
●Equipped with specialized pancreatic casein soy peptone liquid culture medium for inoculation and cultivation of biological indicators
Table 2: Technical Parameters of Tailin Gas Sterilization Biological Indicator
The application of ozone space disinfection is extremely extensive, spanning multiple fields such as healthcare, food, pharmaceuticals, water treatment, and households. The effectiveness of its disinfection highly depends on precise parameter control and environmental adaptability management. Any negligence in any link may lead to sterilization failure and even cause safety risks. The effectiveness of disinfection needs to be ensured through system validation, sterilization challenges, and real-time monitoring.Tailin Life Sciences has been focusing on microbial detection and control for over 30 years, providing solutions and related technical support services for gas sterilization and other sterilization microbial challenges, serving customers and controlling microbial contamination risks.
