Catalytic effects of high Mn(IV) concentrations on Mn(II) oxidation

Abstract

Manganese is one of the common constituents of impounded water and of many well waters. In public supplies, it causes difficulties such as staining of clothes, “black” residues on plumbing fixtures and incrustation of mains. In industrial supplies, it causes severe economic losses through discoloration of products, specks in finished paper, textile, food and beverage products, and reduction of pipeline carrying capacities. Manganese is not known to cause any health problems, and the above conditions are limited to existence of manganese content by 0.05 mg/l in drinking waters, and by 0.1 mg/l or less in industrial waters. The aim of this study, is the removal of manganese (II) by oxidation with atmospheric oxygen, and to precipitate as MnO2 (s), from the waters with high manganese content. The oxidation of manganese (II) is studied in batch reactors in which the concentrations of manganese (IV) was in the range 0–700 mg/l . A quadratic equation has been given to determine the catalytic reaction rate constant as a function of manganese (IV).