An investigation of the oxidative potential of potassium permanganate and chlorine dioxide during the oxidation of reduced manganese
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This project determined the thermodynamic potentials for various reactions between reduced manganese (Mn+2), manganese oxide (MnO2(s)), chlorine dioxide (C102), and potassium permanganate (KMnO4). Based on these findings, laboratory analyses were performed to determine if these reactions would occur under simulated water treatment plant conditions. In addition, a speciation procedure was developed to quantify the various species of manganese and chlorine dioxide present in a single sample. The reactions and the speciation procedure were evaluated at TOC concentrations ranging from < 1.0 mg/L to 5.0 mg/L and at pH 6.0 and 8.0. The speciation procedure yielded a reliable measure of Mn+2, insoluble manganese, and Mn+7; however, the Mn+7 evaluation could be disrupted by the presence of free chlorine. The determination of C102 and C102- concentrations was also possible; however, the C102- concentration was subject to error.
The laboratory analyses revealed that C102 was unable to oxidize either Mn+2 or MnO2(s) to Mn+7 under any of the thermodynamically favored conditions. Both KMn04 and C102 selectively oxidized reduced organic material before reducing the concentration of Mn+2. When C102 and KMnO4 were added simultaneously, the ClO2 reacted preferentially with the reduced materials. Only after the C102 concentration was exhausted did the MnO- begin to oxidize the reduced species.
- Masters Theses