Ozone in Water Treatment
Ozone is used in water purification processes for its disinfection and oxidation abilities. For these reasons, ozonation is a common water treatment technology used in drinking water treatment, food & beverage, biotechnology, pharmaceutical and other manufacturing industries.
Ozonation often forms part of pre-treatment stages of water treatment where it destroys microorganisms and degrades organic contaminants. However, excessive ozone residual remaining can cause corrosion problems to downstream infrastructure and unwanted oxidation of manufactured products, in addition to health risks if left in food and drink.
How Ozone Destruction is Achieved with UV
One molecule of Ozone contains three Oxygen atoms. When exposed to UV light in the 254nm wavelength (UV-C/germicidal), disassociation of one of these atoms occurs. This results in the catalysation of Ozone into Oxygen and water.
UV not only removes residual Ozone, it also acts as another disinfection barrier in the treatment process, with the only by-product being harmless Oxygen.
Design of Ozone Destructing UV Treatment Systems
Ozone destruction using UV requires a much greater UV dose in comparison to inactivation of microorganisms in drinking water. Due to the specialist nature of this application, each Ozone destruction or removal requirement must be discussed prior to any solution being recommended. The amount of Ozone destruction required, in combination with flow rate and UV Transmission (UVT) will be considered in the UV treatment system selection.