Chlorine dioxide was first used in the USA for potable water treatment over 70 years ago near Niagara Falls, NY where it was used to remove phenols without producing noxious chlorophenols. Since then it has become the oxidizer of choice to solve many problems in potable water, including:
- Preliminary oxidation to reduce the formation of chlorinated hydrocarbons (THMs and HAAs) during chlorination
- Oxidation of dissolved manganese and iron to form insoluble manganese or iron, which can be removed. Chlorine dioxide oxidizes manganese to its insoluble state without going all the way to soluble permanganate
- Works well with chlorine.