What is Ozone?

Ozone – Environmentally Friendly Technology

Ozone is the triatomic state of oxygen that its molecule comprises three oxygen atoms. It is an allotrope of oxygen that is unstable. Ozone is one of the most powerful commercially available oxidizing agents. It is commonly used for water and air treatment over a century. When ozone is used, the final byproduct is oxygen, which is an environmentally friendly gas. It is novel technology for better environment.


Natural ozone is produced by UV radiation from sunlight. In addition, industrial ozone is usually generated by electrical discharge producing ozone concentration as high as 300 g/Nm3. It is suitable for all of ozone applications.

History of Ozone

Ozone was first discovered on March 13, 1839 during the electrolysis of water by Christian Friedrich Schonbein. He is German-Swiss chemist and professor of chemistry at the University of Basel since 1828. He named it Ozone, which is derived from the Greek word “ozein” meaning “to smell”.

At the same period, in 1857, Werner von Siemens discovered an alternative method to generate ozone. He presented the first dielectric barrier discharges (DBD) ozone generator that ozone was generated from oxygen or air at atmospheric pressure.


In 1893, the first drinking water treatment plant using ozone for disinfection was installed and operated in Oudshoom, Netherlands, on a water flow of 3 m3/h.

In 1907, the city of Nice, France also installed the ozone generator for disinfection of 22,500 m3/day. The ozone generator using in this plant has the efficiency of 7.1 g/kWh, which is very low compared to the present efficiency.

In the U.S.A., ozone was first used in 1908, particularly for disinfection purposes.

Nowadays, ozone is increasingly used in domestic and industrial applications including disinfection, odor removal, color removal, food processing, laundry system, ground water remediation, bleaching of paper and pulp, swimming pool water treatment, advanced oxidation processes (AOP), etc.