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AWWA ACE94147
- Modeling Manganese Oxidation With Potassium Permanganate
- Conference Proceeding by American Water Works Association, 01/01/1994
- Publisher: AWWA
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A model to predict Mn+2 oxidation and KMnO4 reduction has been developed and tested with full scale data. Site specific rate constants needed to be developed to make the model accurate. The findings from the modeling experiments explain the need for the stoichiometric overdose of KMnO4 at the Fort Collins Water Treatment Facility. The detention time that presently exists between oxidant addition and coagulation is between 3 and 9 minutes which is not sufficient with a stoichiometric KMnO4 dose. Increasing the concentration of KMnO4 increases the oxidation rate allowing the oxidation to be completed before the oxidant is quenched in the solids contact clarifiers. The model is also being used in the design of a detention basin to assure that the KMnO4 concentration is allowed to substantially decay before entering the coagulation process. The results of the modeling experiments emphasized the importance of including DOC in the rate expressions. When an additional rate constant (k4) is added to account for this demand, the prediction of KMnO4 decay is significantly more accurate.
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