Ozone Sterilization VS Ultraviolet Sterilization

Nowadays, ozone and ultraviolet are common sterilization methods. Both of them are widely used in many fields. They are applied for the similar purpose, but they are different. In the following, we will introduce the differences between the two.

Working Principles

To generate ozone. An oxygen molecule with two oxygen atoms will first be ionized and separated. The dissociative oxygen atom will then be combined to another oxygen molecule. Through this process, an oxygen molecule with three oxygen atoms will be produced. It is an ozone molecule. Ozone gas will be gradually generated with the aggregation of ozone molecules. Ozone is chemically active. Therefore, it is also called reactive oxygen.

Ozone sterilization is at bacteriolytic level. It has a wide application range including air, surface and water sterilization. Its sterilization process is thorough, with no residue will be produced in the process. Ozone can kill bacteria, spores, viruses, fungi, and can destroy botulinum toxin. It is not only highly effective in killing a variety of bacteria, but also very functional in removing mold. The factors affecting ozone sterilization include humidity, temperature, fresh air volume, ozone density, treatment time, etc.

Ultraviolet can cause the break of DNA chain of the microorganisms after being absorbed, resulting in the breakdown of nucleic acid and protein crosslinking. Ultraviolet kills microorganisms by affecting the normal biological activity of nucleic acid, resulting in the death of the microorganisms. Ultraviolet sterilization is at bactericidal level, which means it cannot kill microorganisms thoroughly. Basically, it will not realize the effective elimination of viruses.


Ozone is generally used in the of air, surface and water sterilization. It is widely used for odor removal, industrial oxidation reaction, the reduction of the incidence of infectious diseases, etc. Ozone can also be used in sewage treatment. When used for water treatment, ozone is also capable of bleaching and decolorizing water.

Except for its high efficiency, it is also broad-spectrum. Ozone is instable. It will quickly break itself down into oxygen and individual oxygen atoms. Single oxygen atoms will then combine themselves to oxygen molecules without no toxic residue produced. So, ozone is known as a clean sterilizer.
Under normal temperature and pressure conditions, ozone is in the form of gas. In its sterilization process, ozone can reach almost any location. Ozone can not only kill viruses directly, but also kill pathogens and microorganisms where the viruses may dwell.

Ultraviolet light is mainly adopted in the production or assembly lines and the medical industry. Ultraviolet sterilization light is functional to treat air and surface within a room. For better sterilization effect for an operating table, the most appropriate height of the ultraviolet light will be 1-1.5m from surface of the table.


If ozone sterilization will be used in areas with the direct contact with flammable and explosive gases, there should be gas replacement in advance. The proper working condition of an ozone generator is at a temperature between -20℃ and 50℃ without a high humidity. Long-term use under improper environment will affect the service life of the machine.

For health protection, since long-term exposure to ozone will cause health problems, an ozone generator cannot be used when there is person present in a room. After the ozone sterilization process, for safety concern, the just treated room should be left unoccupied for 40 minutes for air ventilation before being reoccupied again.

For ultraviolet sterilization, the space to be treated should be kept clean and dry in order to reduce the impact of dust and water mist on the machine. When the temperature is lower than 20℃ or higher than 40℃, and the relative humidity is greater than 60%, the working time of the ultraviolet germicidal lights should be appropriately extended. The lifespan of ultraviolet germicidal lights is inversely proportional to their irradiation intensity. Their general service life is usually less than 1000 hours. The lights must be replaced when they are beyond the service life. Moreover, since ultraviolet irradiation is harmful to human skin and eyes, so it is not applicable when there is people present within a room.