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We report preliminary studies on the precipitation of manganese compounds by oxidation with Caro’s Acid (peroxomonosulphuric acid, H2SO5) or hydrogen peroxide (H2O2), from solutions with [Mn] = 1.2 g/L to achieve residual [Mn] <1 mg/L at a pH range of 5–9. It was found that with the addition of sodium carbonate and either Caro’s acid or hydrogen peroxide, it was possible to reduce manganese from...