Ozonation ozone water treatment ozone is a form of oxygen o2 with the molecular formula o3 it forms when oxygen in the air is exposed to the discharge of a powerful electric current through air in nature it forms in the upper atmosphere when lightning passes through the air. Ozone was first used in water treatment in the late 1800s and ozone is more widely used in europe and asia than the united states at home water screening test ozone is an unstable gas comprising of three oxygen atoms the gas will readily degrade back to oxygen and during this transition a free oxygen atom or free radical form. Thus ozone can be used as an oxidant where it is applied at the latter stages of water treatment there are more than 2000 installations worldwide that use ozone to treat drinking water ozone is an effective disinfectant for treating municipal and industrial wastewater enabling the end user to meet epa pre treatment standards. Ozonation is an efficient treatment to reduce the amounts of micropollutants released in the aquatic systems by wastewater treatment plants margot et al 2011 although no residual by products are generated by ozone itself some concerns are raised regarding oxidation by products when water containing both organics and ions such as bromide iodide and chlorine ions are treated with ozonation
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