Water Treatment of Manganese Oxides and Organic Matter through Pre-Oxidation and Coagulation/Sedimentation

Abstract

We investigated the reducing rate of manganese oxides (MnOs) and organic matter in water by using pre-oxidation and coagulation/sedimentation methods with different chemicals. The reduction rate using NaOCl for organic matter was about 11%, while that of manganese was 12%. The reduction rate using chlorine dioxide (ClO2) was only 7% for organic matter. However, the rate of manganese was 29% when using ClO2. Potassium permanganate (KMnO4) removed organic matter and MnOs more effectively, with a rate of 18 and 71%. Moreover, aluminum sulfate (Al2(SO4)3), ferric chloride (FeCl3), and polysilicate iron (PSI) worked more effectively, with a reduction rate of 99% and 55% for turbidity and organic matter.

Keywords

• pre-chlorination
• manganese
• organic matter
• turbidity