Kinetics of Manganese(II) Oxidation with Chlorine
Publication: Journal of Environmental Engineering
Volume 117, Issue 3
Abstract
Kinetics of manganese(II) oxidation with chlorine as well as the effects of chlorine dose and the presence of complexing agents are evaluated. Mn(II) oxidation is facilitated by excess chlorine at An autocatalytic model analogous to that for Mn(II) oxidation by is developed in which the major mechanism for Mn(II) removal is heterogeneous Mn(II) adsorption onto newly precipitated The same model also describes the effects of pH and the external addition of on Mn(II) removal. The model applications in water treatment and acid mine drainage control for Mn(II) removal with chlorine are discussed. Mn(II) oxygenation in the presence of equimolar ligand indicated the following: complete inhibition in the Mn‐ethylenediaminetetracetic acid (Mn‐EDTA) system, moderate inhibition in the Mn‐iminodiacetic acid (Mn‐IDA) system, and slight inhibition in the Mn‐glycine (Mn‐GLY) system. The degree of inhibition, similar to that previously found for Fe(II) oxidation, follows the Mn‐ligand complex affinity. However, Mn(II) removal in these systems occurs differently with chlorine as the oxidizing agent. Mn‐EDTA accelerates the reaction while both Mn‐IDA and Mn‐GLY retards the reaction. The catalytic effect of the Mn‐EDTA complex is discussed. Mn(II) oxidation kinetics in terms of complexation stability constant, ligand/Mn(II) ratio, and chlorine dose are described.
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Copyright © 1991 ASCE.
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Published online: May 1, 1991
Published in print: May 1991
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