Ozone is commonly produced from oxygen or air by utilizing ultraviolet (UV) light or corona discharge generators. UV light systems use radiation at 185 nm wavelength emitted from high-transmission UV lamps. These systems are relatively low cost and do not require dry air for ozone production. The corona discharge generators can produce larger concentrations of ozone, up to 4%, compared to UV light systems. They mainly consist of two electrodes separated by a dielectric or nonconducting material, providing a narrow discharge gap. When a high-voltage alternating current is applied across this gap, the air or oxygen passing through the gap is partially ionized, and the oxygen molecules are dissociated. The split oxygen atoms combine with other oxygen molecules to form ozone. Dried air is required for this system to prevent corrosion of metal surfaces. Ozone can also be produced by cold plasma and electrochemical methods . Some commercial ozone generator manufacturers include IN USA, Inc. (Needham, MA), Lenntech, Inc. (College Station, TX), Ozone Solution, Inc. (Sioux Center, IA), Ozomax Ltd (Quebec, Canada), Longevity Resources, Inc. (British Columbia, Canada), and Ozone Services & Yanco Industries Ltd (Burton, B.C., Canada).
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