Features of reactant treatment of chromium-containing waste water of electroplating industry

Tsybulskaya, Oksana Nikolaevna; Ксеник, Т.В.; Yudakov, A. A.; Slesarenko, Vyacheslav Vladimirovich; Perfiliev, Aleksandr Vladimirovich; Кисель, А.А.

doi:10.23877/ms.ts.23.013

Cited by 3 publications

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“…The reagent method (recovery method) is widespread because of the minimum cost and relative simplicity of its technological process, due to which the maximum extraction in a wide range of parameters of chromium-containing waste is provided [46]. The reduction of hexavalent chromium to trivalent chromium by inorganic reducing agents is carried out in an acidic environment, followed by the precipitation of metal ions in the form of hydroxides in an alkaline environment [47].…”

Section: Literature Reviewmentioning

confidence: 99%

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Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium

et al. 2023

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The article is devoted to the neutralization of the harmful effects of aluminochrome catalyst sludge. Catalyst sludge is a waste product from petrochemical production and poses a serious threat to the environment and humans because of the toxic hexavalent chromium it contains. The emissions of Russian petrochemical enterprises’ alumochrome sludge is 10,000–12,000 tons per year. In this paper, research related to the possibility of reducing the harmful effects of sludge by converting hexavalent chromium to a less dangerous trivalent state is presented. The reduction of hexavalent chromium was carried out with different reagents: Na2SO3, FeSO4, Na2S2O3, and Na2S2O5. Then, a comparative analysis was carried out, and sodium metabisulfite was chosen as the most preferred reagent. The peculiarity of the reducing method was carrying out the reaction in a neutral medium, pH = 7.0. The reduction was carried out in the temperature range of 60–85 °C and under standard conditions. The maximum recovery efficiency of chromium from the catalyst sludge (100%) was achieved at 85 °C and 10 min. This method did not involve the use of concentrated sulfuric acid, as in a number of common techniques, or additional reagents for the precipitation of chromium in the form of hydroxide.

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Section: Literature Reviewmentioning

confidence: 99%

“…The most commonly used reagents to convert Cr (VI) to Cr (III) are the sodium salts of sulfuric acid: sulfite (Na 2 SO 3 ), bisulfite (NaHSO 3 ), thiosulfate (Na 2 S 2 O 5 ), iron sulfate (FeSO 4 ), iron chips, and organic reducing agents. The reductions proceed according to the following reactions (1)-(4) [47][48][49]:…”

Section: Literature Reviewmentioning

confidence: 99%

Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium

et al. 2023

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“…The most common treatment of chromium-containing wastewater in the electroplating industry is a method based on the reduction of chromium (VI) followed by the precipitation of trivalent chromium [ 13 , 14 ]. This method is based on the use of relatively cheap reducing agents resulting in products of a lower toxicity class.…”

Section: Introductionmentioning

confidence: 99%

Chromium-Modified Heterogeneous Bipolar Membrane: Structure, Characteristics, and Practical Application in Electrodialysis

Козадерова

2023

Membranes

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The modification of an MB-2 bipolar ion exchange membrane with chromium (III) hydroxide was carried out by a chemical method, namely, by the sequential treatment of the membrane with a solution of chromium (III) salt and alkali. Data on the morphology, phase, and chemical composition of the modified membrane were obtained using scanning electron microscopy and energy-dispersive analysis. In particular, it was shown that the modifier was distributed in a layer 30–50 microns thick at the boundary of the cation- and anion-exchange layers of the bipolar membrane. The electrochemical behavior of the modified membrane in the process of sodium sulfate conversion was studied by measurements of the following characteristics: the current efficiency of the acid and base, the energy consumption of the process, and the degree of contamination of the target products with salt ions. It was shown that the resulting membrane has an alkali and acid yield of 61% and 57%, respectively. This is higher than the same yields for the industrial unmodified MB-2 membrane (38% and 30%). The results of this study demonstrated that the modified samples allowed obtaining a higher yield of acid and base, reducing the content of salt ions in the target products and also reducing the electricity consumption for obtaining a unit of the target product. The concentration dependences of the electrical conductivity of the MK-40 heterogeneous ion-exchange membrane, which is a cation-exchange layer of MB-2, in sodium sulfate solutions before and after its modification with chromium (III) oxide were obtained. A decrease in the specific electrical conductivity of the membrane with the introduction of a modifier was established. A quantitative assessment of the influence of the modifier on the current flow, volume fraction, and spatial orientation of the conductive phases of MK-40 was carried out using an extended three-wire model for the description of the model parameters of ion-exchange materials. When a modifying additive was introduced into MK-40, the fraction of the current passing through the inner solution and the intergel phase decreased. This was due to the substitution of part of the free solution in the pore volume by the modifier. A variant of the practical application of electrodialysis with the chromium-modified bipolar ion-exchange membranes is recommended.

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Reagent decontamination of liquid chrome-containing industrial wastes

Tsybulskaya

Ксеник

Yudakov

et al. 2019

Environmental Technology & Innovation

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Features of reactant treatment of chromium-containing waste water of electroplating industry

Cited by 3 publications

References 0 publications

Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium

Method for Decontamination of Toxic Aluminochrome Catalyst Sludge by Reduction of Hexavalent Chromium

Chromium-Modified Heterogeneous Bipolar Membrane: Structure, Characteristics, and Practical Application in Electrodialysis

Reagent decontamination of liquid chrome-containing industrial wastes

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