Temperature and humidity are important factors affecting ozone disinfection
Microbial aerosol has a great impact on human life and health. The global respiratory tract infection caused by it is up to 20.0%, and 14 of the 41 major infectious diseases in the world are transmitted through the air. Hospital-acquired respiratory infection is closely related to the air quality of the ward, and infectious microbial aerosol is the most important factor leading to hospital infection. In our country, the infection rate of respiratory tract in hospital infection has been high for many years, and the outbreak of SARS in 2003 was caused by the typical close aerosol transmission. The purpose of this paper is to understand the influencing factors of ozone air disinfection.

The results showed that temperature affected the disinfection effect, and the difference was statistically significant (F= 11.19, P< 0.01). The relative humidity had a significant effect on the disinfection effect (F= 14.65, P< 0.01). The influence of relative humidity and temperature on disinfection effect was interactive (F= 4.38, P< 0.05). (2) Spray pressure and organic matter content of microbial aerosol medium: there was no statistical significance in the effect of spray pressure on disinfection effect (F= 1.39, P) 0.05). There was no significant difference in the effect of organic matter content of microbial aerosol on disinfection effect (F1-2.63, P) 0.05).
Ozone is a strong oxidizing agent and catalyst, which has a broad spectrum and efficient bactericidal effect, and is suitable for indoor air disinfection under unmanned conditions. The air disinfection effect of ozone generator is good, but there are many factors affecting ozone disinfection. According to the factorial test design, the microbial bactericidal effect of temperature and relative humidity on a surface discharge ozone generator is tested. The results show that the difference between the effect of temperature and relative humidity on ozone killing microbial aerosol is statistically significant, and there is an interaction, which is consistent with the results of this study. In the general environment, the higher the temperature, the better the disinfection effect; The higher the relative humidity, the better the disinfection effect. The aerosol particle size composition was affected by different spray pressure, but there was no significant difference in ozone disinfection effect. The sterilization Technical Specification does not specify the spray pressure. Our research results show that within the range of 0.4, 0.5 and 0.6 MPa, the microbial aerosol generation in the 6th Andersen air microbial sampler has different grade composition, and the particle size composition ≤ 7.0 micrograms is > 90.0%. Therefore, The particle size composition of microbial aerosols ≤ 7.0 micrograms produced by different spray pressures had no effect on the ozone disinfection effect. The organic content of microbial aerosol media had no statistical significance on the ozone disinfection effect under the test conditions, but the disinfection effect of non-organic matter in the pre-test media could be improved by at least 1 pair value compared with that of organic matter. disappearing
In the evaluation of toxicological tests, the disinfection effect of disinfection factors is generally expressed by the bactericidal rate or the bactericidal pair value. When the number of colonies after disinfection ≠0, that is, the bactericidal rate ≠ 100.00%, the number of “9″ in the killing rate is equal to the single digit of LgN, such as bactericidal rate = 99.9G %, LgN—- 3.0. In the simulated field test, the standard for evaluating the qualification of disinfection is the bactericidal rate ≥ 99.90%, that is, LgN≥ 3.0. Therefore, due to the influence of a certain factor to improve the disinfection effect of 1 value is very practical significance, but 99.90% and 99.99% difference is only 0.09%, it is possible that the difference is not statistically significant in the statistical test, but it is still helpful in practical work. If the content of organic matter is less than 10.00%, the effect on the killing effect of microorganisms in the air is not significant. If the content of organic matter is less than 10.00%, the killing rate of Escherichia coli on the surface of ozone decreases from 99.93% to 89.38% [9]. Therefore, the effect of organic matter on microbial aerosol needs further study.
The oxygen service center concluded that when using ozone to disinfect the air, attention should be paid to the temperature and relative humidity of the environment, especially in the dry winter, when the indoor temperature and relative humidity are relatively low, it can be used before disinfection
Spraying water, spray humidification and other methods to increase the relative humidity of the environment to improve the disinfection effect of ozone. If it is an organic-rich environment, such as a large number of body fluids splashing (operating room) or the upper respiratory tract patients dense place or livestock house, in the selection of ozone generators, should increase the ozone concentration or extend the disinfection time, in the hospital selection of ozone disinfection air, the room should be closed, and no one conditions, and correct selection, reasonable use.