Ozone is an unstable, gaseous allotrope of oxygen, which is itself a powerful naturally occurring oxidant. Ozone is produced when ultraviolet rays in the sun light bombard oxygen molecules in the upper atmosphere. This reaction produced an earth’s ozone protection layer that masks deadly rays.
Ozone was discovered very early. In the 1840s, CFSchonbein smelled an unusual smell when doing electrolysis and discharge tests. He recognized that the smell was the same as that after lightning. It is named “Ozone” and its source is the Greek word “ozein” (Italian).
People also have a long history of using ozone. In 1906, the first municipal water purification equipment using ozone was built in Nice, France. In 1937, Bryam of Northern California exhibited an ozone system as a representative of future water treatment equipment at the 39/40 World Expo in New York. Since then, ozone has been widely used in various fields such as water treatment, pharmaceutical, paper bleaching, perfume, deodorization and disinfection.
When we use ozone, we have to know the right ozone concentration both for water and for air.
For water,In order to ensure the sterilization effect, it must ensure a certain concentration of ozone and treatment time in the water. To ensure a certain concentration of ozone in the water, it is necessary to ensure:
1. The concentration of the ozone source.
2. Certain temperature.
3. The water temperature should not be too high.
4. The specific surface area of the ozone gas in the water is as large as possible, so that the ozone and water contact opportunities are more.
According to the domestic and international application experience, the water quality disinfection treatment parameters of general water quality are recommended as: water soluble ozone concentration O.4mg / L, contact time is 4 minutes, that is, CT value is 1.6. Ozone dosage is 1-2mg / L, water temperature is best Below 25℃. The former Soviet Union standard stipulates that the ozone concentration in drinking water is not less than 0.3 mg/L. The bottled water industry in China recommends that the water concentration in the bottle is 0.3 mg/L.
For air purifier,several ACGIH (American Conference of Governmental Industrial Hygienists) guidelines for ozone in the workplace:
0.2 ppm for no more than 2 hours exposure
0.1 ppm for 8 hours per day exposure doing light work
0.08 ppm for 8 hours per day exposure doing moderate work
0.05 ppm for 8 hours per day exposure doing heavy work
For swimming pool water,In swimming pool water treatment, the dosage of ozone is related to the temperature of the swimming pool. The higher the water temperature, the larger the dosage. For standard swimming pools, the dosage of ozone should not exceed 1.0 mg/l. In swimming pool water treatment, the dosage of ozone is 0.8-1.0 mg/L.
The key factors affecting the advancement and quality of ozone generator technology are the gas source and power source. The use of oxygen as a gas source using oxygen as a gas source can increase the ozone concentration from 1% to more than 4-6%, which proportionally increases the dissolution efficiency of ozone in water and improves the water treatment effect. Make
The use of medium and high frequency power supplies will reduce the size of the equipment, reduce the discharge voltage, improve the safety and reliability of the system, and become the main development direction of the ozone generator. Therefore, the use of oxygen as a gas source and the use of medium and high frequency power sources will become the main development direction of ozone generators.