How long after ozone disinfection will the air return to a safe concentration?

After ozone disinfection, the concentration of ozone in the air takes some time to reduce to a safe level. It is generally recommended to open the window and ventilate for 30-60 minutes after ozone disinfection before entering the disinfection environment, which can ensure that the ozone concentration in the air is reduced to a relatively safe degree for the human body. The half-life of ozone is about 20-30 minutes at room temperature, so ventilation helps to accelerate the decomposition of ozone.

In special cases, if the ozone concentration used is high or the environment is poorly ventilated, it may be necessary to extend the ventilation time to 1 hour or more. After ozone disinfection, it should be ensured that the room is airtight, personnel must leave, and adequate ventilation should be carried out after disinfection to ensure safety.

 

Application of ozone in different fields

• Food processing technology: used for work clothes disinfection, production water sterilization, fruit and vegetable preservation

• Disinfection of food cold storage and fresh-keeping cold storage: Continuous disinfection for 34 hours to kill mold and bacteria

 

Requirements and conditions for ozone sterilization in food factories

• Ozone concentration: The concentration varies according to different application scenarios

• Relative humidity: General requirements ≥70%

• Action time: Adjust according to different occasions, such as air disinfection 30-120 minutes, surface disinfection 60-120 minutes

 

Verification guide

• Turn off fresh air and return air: Ensure disinfection effect

• Startup time: 1-1.5 hours for air sterilization and 2-2.5 hours for surface sterilization per day

• Microbial killing rate: airborne bacteria (24)×10^6, surface settling bacteria (1015)×10^6

 

Principle of ozone sterilization

• Ozone is made by applying high voltage to oxygen

• High concentration ozone gas is released to the area to be disinfected

• Design specification: Usually 10ppm or higher, relative humidity 80% or higher ozone residual concentration after disinfection

•GB/T18883 "Indoor Air Quality Standard" : 0.16mg/m3

 

Matters needing attention

• When using ozone machine for sterilization, ventilation should be maintained to disperse residual ozone