Ozone can be produced by ultraviolet light, corona discharge or electrolysis. But what are their differences and applications?
Ultraviolet ozone generator
The ultraviolet irradiation method uses ultraviolet rays to irradiate dry oxygen, so that some oxygen molecules are activated and dissociated into oxygen atoms to form ozone. The characteristics of ozone generation by ultraviolet irradiation are low ozone concentration, and the advantage is that it is not easy to produce oxides and does not require complex conversion equipment. However, the ultraviolet irradiation method is not suitable for mass production of ozone, and is only suitable for various tests that require small amounts and low concentrations, such as air disinfection, sterilization, and deodorization. Air treatment applications often use ultraviolet ozone generators with great success. Due to the low concentration of ozone produced, ultraviolet ozone generators are not suitable for many water treatment applications.
Corona discharge ozone generator
A corona is generated in the gas through an alternating high-voltage electric field. The free high-energy electrons in the corona dissociate oxygen molecules and polymerize into ozone molecules by collision. The dielectric barrier discharge method has the advantages of relatively low energy consumption, large output of single-machine ozone, and the use of dry air, oxygen or oxygen-enriched gas with high oxygen concentration as the gas source. Therefore, most industrial ozone synthesis uses this method. Ozone is produced by oxygen or dry air. If air is used, it must be dried as by-products are produced during the ozone generation process.
Electrolytic ozone generator
The technology of preparing ozone by electrolysis was founded in 1840, mainly through the use of low-voltage direct current to electrolyze water, so that the water is oxidized at the anode-solution interface to produce ozone. The ozone preparation device is composed of electrolyte solution and anode and cathode. Ozone is precipitated at the anode, and the cathode can be divided into two types: hydrogen evolution cathode and oxygen reduction cathode. Ozone is directly produced by electrolysis in water, so there is no need for gas-liquid contact equipment for ultraviolet or corona discharge ozone generators. Due to the contamination and decomposition of the anode and cathode used in this method, the water must be very clean for electrolytic ozone production.