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  • Title: Enhanced coagulation with in situ manganese dioxide on removal of humic acid in micro-polluted water.
    Author: Zeng Y, Zeng Z, Wang J.
    Journal: Water Sci Technol; 2015; 72(3):406-14. PubMed ID: 26204072.
    Abstract:
    The morphology and surface characteristics of manganese dioxide (MnO₂) formed in situ, which was prepared through the oxidation of MnSO₄using KMnO₄, were studied. The effects of factors including the form of MnO₂, dosage, pH, dosing sequence of in situ MnO₂on the enhanced coagulation were systematically evaluated. The results of analysis by the UV254 and permanganate index CODMn methods indicated that humic acid removal increased from 9.2 and 2.5% to 55.0 and 38.9%, when 10 mg/L of the in situ MnO₂ was added in the presence of 2 mg/L of polyaluminum sulfate. The studies of orthogonal experiment revealed that coagulation was most affected by the pH, whereas the dosage of in situ MnO₂and slow stirring duration exhibited a weaker effect. At a pH value of 4.0, in situ MnO₂dosage of 10 mg/L, slow stir over 40 min, and the total solids content was 20 mg/L, the humic acid removal by UV254 and CODMn methods reached 71.2 and 61.2%. These results indicated that the presence of in situ MnO₂enhanced the coagulation and removal of humic acid from water.
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