Although they can occur naturally, mainly due to electrical storms, corona discharges can also be caused by special electrical equipment. To be created on demand, corona discharge requires specific elements. To begin with, an alternating or direct current must be supplied between two high potential electrodes. These electrodes must be separated by a neutral fluid such as air or ultra-pure water. When the discharge touches the fluid, a plasma is created, and the electric charge is activated by changing the ions to neutral gas molecules.
In other words, the corona effect is an electrical phenomenon causing a partial discharge and is caused by the ionization of a fluid surrounding a conductor. The corona discharge takes place when the geometric conditions do not allow the formation of an electric arc. For example, corona effects can be seen frequently around high-voltage power lines or on Tesla coils.
In water treatment, corona discharges can be used to create ozone since the discharge alters the covalent bonds of the oxygen molecules and allows the oxygen atoms to suddenly collide and create O3.
Même s’il existe plusieurs techniques de production de l’ozone pour le traitement des eaux, les générateurs d’ozone à décharge de corona sont les plus répandus dans l’industrie puisqu’ils sont ceux qui présentent le meilleur rendement et la plus grande efficacité.
- The Ozonia ozone generators are an example of this and can produce up to 250 kg/h of ozone.
If you are curious and would like to learn more about the use, production, and effect of ozone in industrial water treatment, please visit this article about ozonation.
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