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Oxidation allows eliminating contaminant substances present in water. This involves oxidising the chemical compound - as if the substance were being consumed in the water itself.

This step may also decrease the odor, taste and color of the treated wastewater.

The most common oxidizing agents are ozone, chlorine dioxide and potassium permanganate. The choice and dosage of the reactant depend upon the raw wastewater quality, the treatment objectives and in particular for the chlorine dioxide, the limits set on chlorite formation.

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