Determination of basic parameters affecting the water treatment from manganese compounds on the sorbent-catalyst

Мамченко, А. В.; Чернова, Н. Н.

doi:10.3103/s1063455x12050049

Cited by 3 publications

(1 citation statement)

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“…It should be noted that the oxidation of Mn 2+ ions, even in the presence of catalysts, largely depends on a set of factors [Mamchenko et al, 2012], such as: pH, redox potential of the medium, the concentration of manganese and oxygen ions. The author [Mamchenko et al, 2013] concluded that the autooxidation reaction between Mn (II) and MnO 2 in solutions does not occur at pH below 9.0.…”

Section: Introductionmentioning

confidence: 99%

Usage of Sorbent-Catalyst to Accelerate the Oxidation of Manganese

Gomelya¹,

Tverdokhlib²,

Shabliy³

et al. 2021

J. Ecol. Eng.

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The processes of manganese (II) ions removal from water using sorbent catalysts and ion exchange materials modified with iron oxides were studied. It was shown that manganese ions oxidize very slowly in artesian water, even when the pH is adjusted to 9.0. Intensive aeration of solutions due to stirring also does not promote the oxidation of manganese (II) ions. The degree of manganese extraction due to oxidation is reduced from 20-30% for solutions with a concentration of manganese ions of 1 and 5 mg/dm 3 to 11-15% for solutions with a concentration of 15 and 30 mg/dm 3 . A significant increase in the oxidation efficiency of manganese ions was achieved by using magnetite as a sorbent catalyst. The efficiency of water demanganization increases along with the intensity of water aeration when mixing solutions. It was established that strongly acid cation exchangers provide efficient extraction of manganese ions from water. At the same time, a high exchange capacity of strong acid cation exchange resin KU-2-8 in acid and salt form was noted. It was shown that the capacity of manganese ions of this cation exchange resin in the Ca 2+ -form is slightly lower. When using the KU-2-8 in Ca 2+ -form of cation exchange resin to remove manganese ions from the solution already in the first samples, the leakage of manganese ions at the level of 10 mg/dm 3 and above was observed. This indicates that this form of ion exchanger is not suitable for deep purification of water from manganese (II) ions. In order to increase the efficiency of manganese ion extraction from water, increase the duration of the filter cycle, magnetite and magnetite-modified KU-2-8 cation exchange resin were used as a sorbent-catalyst. It was shown that the cation exchange resin modified with magnetite provides the removal of a significant part of manganese ions due to catalytic oxidation on magnetite. The conditions of effective manganese extraction under static and dynamic conditions are determined.

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Section: Introductionmentioning

confidence: 99%