What is ozone?

Ozone is an unstable molecule formed when oxygen molecules, O₂, are split and recombine as O₃. Because of its structure, ozone readily reacts with many organic and inorganic substances. This makes it a powerful oxidising agent, often used where oxidation, disinfection or odour reduction is required.

Unlike many conventional chemicals, ozone does not remain permanently in the treated environment. It naturally decomposes back into oxygen over time. This is one of the reasons ozone is widely used in applications where strong oxidation is required without leaving a long-lasting chemical residual.

How is ozone produced?

For industrial and commercial use, ozone is usually produced using an ozone generator. The most common method is corona discharge, where dry air or oxygen is passed through a high-voltage electrical field. This electrical energy splits oxygen molecules and allows some of the oxygen atoms to recombine as ozone.

Ozone can also be produced by ultraviolet light or electrolytic methods, although corona discharge is generally used for larger industrial systems. The correct production method depends on the application, required ozone output, gas source, operating conditions and how the ozone will be transferred into air or water.

Key properties of ozone

Ozone is valued because it reacts quickly and strongly with many contaminants, odours and microorganisms. However, these same properties mean it must be applied carefully. A successful ozone system is not only about generator size. It also depends on contact time, transfer efficiency, process conditions, monitoring and safety control.

• Strong oxidising power: ozone can react with many organic compounds, odour molecules and microorganisms.
• Short-lived residual: ozone naturally decomposes back into oxygen, depending on temperature, water quality and process conditions.
• On-site generation: ozone is normally produced at the point of use because it cannot be stored and transported like many conventional chemicals.
• Application-sensitive performance: results depend heavily on correct system design, not just the ozone generator itself.

What is ozone used for?

Ozone is used across a wide range of industrial, commercial and environmental applications. Its role is usually linked to oxidation, microbial control, odour reduction or water treatment. The exact design depends on the target problem and the conditions of the process.

Water treatment

In water treatment, ozone can be used for oxidation, disinfection support, colour and odour reduction, and the treatment of certain organic contaminants. It is often applied in drinking water, process water, wastewater polishing, aquaculture, bottled water and specialist industrial water systems.

Odour control

Ozone can be used to oxidise odour-causing compounds in air streams, provided the system is designed with suitable contact time, mixing and safety controls. It is important to avoid treating ozone as a simple air freshener. In engineered odour control, duct layout, air volume, injection points and residual ozone control are all important.

Food and hygiene applications

Ozone may be used in certain hygiene-related applications, including equipment, surfaces, wash water, process areas and supporting systems where regulations and site procedures allow. In food environments, application design and compliance must be reviewed carefully, particularly where direct product contact is being considered.

Process oxidation

Ozone is also used in specialist oxidation processes where conventional chemical treatment may be less suitable. These applications often require laboratory testing, pilot trials or detailed process assessment before full-scale system design.

Why system design matters

One of the most common mistakes in ozone projects is focusing only on the generator output. The amount of ozone produced is important, but it does not automatically determine the amount of ozone delivered into the process.

In water applications, for example, the real result depends on how efficiently ozone is transferred into the water, how long it remains in contact with the target contaminants, and how the process is monitored and controlled. In air applications, mixing, duct length, air velocity and contact time can be just as important as the ozone generator itself.

This is why engineered ozone systems should be specified around the process requirement, not simply around a catalogue output figure.

Is ozone safe?

Ozone is a powerful oxidising gas and must be used with suitable safety controls. Exposure to elevated ozone concentrations can be harmful, so industrial systems should be designed with appropriate containment, ventilation, monitoring, interlocks and off-gas destruction where required.

When ozone is correctly generated, controlled and integrated, it can be used safely in many industrial and commercial applications. The key is to treat ozone as an engineered process technology, not as a simple plug-in device.

Ozone in summary

Ozone is a highly reactive form of oxygen with strong oxidising properties. It can be produced on site and used in controlled systems for water treatment, odour control, hygiene support and process applications. Its effectiveness depends on much more than the generator alone. Correct sizing, transfer, contact time, monitoring and safety design are essential.

For industrial users, the most important question is not only “what is ozone?” but whether ozone is suitable for the specific process, target problem and operating conditions.