Permanganate (MnO4) is a strong oxidant used in water treatment to control taste, odours, biological growth, zebra mussels, and to remove colour, manganese and iron. In addition, it can be used to control the formation of disinfection by-products by oxidizing the organic precursors. In industrial waste treatment, it is used for odour control, toxic pollutant destruction, bio-augmentation, and grease removal.
WHY IS IT IMPORTANT?
Although it is an effective treatment aid, residual permanganate is not desirable in the treated water. For this reason, dosing needs to be carefully controlled and adjusted to provide just enough is to achieve treatment goals but not in excess so that no residual remains in the water. Quick and reliable dose pacing of potassium permanganate can be accomplished by monitoring its concentration in real time at a location downstream of the application point. Concentrations exceeding a pre-determined threshold at the monitoring point would indicate overdosing, and therefore dosing can be adjusted accordingly.