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Peculiarities of Preparation of Drinking Water from Surface Sources with High Contents of Natural Organic Compounds, Iron, and Manganese

  • PHYSICAL CHEMISTRY OF WATER TREATMENT PROCESSES
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Abstract

The peculiarities of the Dnieper river water that contains natural organic compounds of allochthonous origin, in the composition of which fulvic acids with a molecular mass of about 1.0 kDa predominate, are investigated. It is established that the use of iron-containing coagulants in the process of purification of such water leads to its enrichment with iron compounds and a corresponding increase in its color intensity. Comparison of the effectiveness of aluminum and iron coagulants showed that both reagents lead to a stable decrease in Dnieper water coloration caused by humic acids. However, the use of iron(II) sulfate does not reduce water coloration caused by fulvic acids because of the formation of stable soluble hydroxofulvate complexes. It is shown that the redox system of Dnieper water is at the transition boundaries between Fe2+ and hydroxide Fe(OH)3 and between Mn2+ and oxides MnO2 and Mn2O3. The replacement of the standard chlorine agent with chlorine dioxide results in moving this boundary with the formation of finely dispersed flakes of iron hydroxide and particles of manganese oxides. As a result, the use of chlorine dioxide (ClO2) in doses of 0.2–1.25 mg/dm3 in the final stage of water purification leads to an increase in water coloration intensity, which can be successfully reduced by filtration. With an increase in the dose of ClO2, an inverse relationship is established between the dynamics of water colorarion intensity growth and the decrease in the Mn content during filtration. The correlation coefficient between these factors is r = –1, which indicates that the presence of manganese is the main factor for increasing the color intensity upon the treatment of water with chlorine dioxide in the summer season. On the basis of the obtained results, a flexible scheme is proposed for chlorine dioxide supply with the following stages: primary treatment at the entrance to water treatment facilites, secondary treatment after coagulation and settling of water before fast filtration, and final disinfection before supplying drinking water to the city.

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Correspondence to O. Yu. Kulishenko.

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Translated by O. Kadkin

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Kulishenko, O.Y., Klymenko, N.A., Savchyna, L.A. et al. Peculiarities of Preparation of Drinking Water from Surface Sources with High Contents of Natural Organic Compounds, Iron, and Manganese. J. Water Chem. Technol. 43, 448–458 (2021). https://doi.org/10.3103/S1063455X21060059

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  • DOI: https://doi.org/10.3103/S1063455X21060059

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