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AWWA WKICO66066
- Chlorine Dioxide as a Preferential Oxidant for Manganese in the Presence of TOC in Surface Waters
- Conference Proceeding by American Water Works Association, 01/01/2008
- Publisher: AWWA
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This powerpoint presentation begins by providing background information on manganese chemistry. Manganese treatment options are listed, along with manganese speciation, oxidant use for manganese reduction, and chlorine dioxide for manganese reduction. Three case studies are outlined from the northeastern, southeastern and Rocky Mountain areas of the country. Summary:chlorine dioxide is a viable alternate oxidant for achievingfinished water soluble manganese < 20 µg/L in surfacewater treatment plants where total organic carbon (TOC) is present,without exceeding the MRDL/MCL (chlorite); chlorine dioxide should be included in evaluations of feasibleoxidation options for manganese removal; testing must include analysis of chlorite and chlorate yield to ensurecompliance with MCL;if soluble manganese exceeds 0.4 mg/L may need other oxidants(dependant on chlorite yield);pay attention to speciation in raw and settled manganeseconcentrations; and,new systems exist that can generate chlorinedioxide without chlorine gas usage. Includes tables, figures.
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