<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The results of electrochemical processing of spent acidic, neutral, and alkaline sulfate-chloride-containing regenerative solutions in two- and three-chamber electrolyzers are presented. It has been determined that the highest current efficiency for the products of electrodialysis can be achieved in the presence of hardness ions when processing acidic sulfate-containing solutions using three-chamber electrolyzers. It has been established that during electrodialysis of alkaline solutions after regeneration of anionites containing chloride ions, accumulation of alkali occurs in the cathodic region, and in the anodic region, chloride ions accumulate due to diffusion through the anion exchange membrane during the first stage, followed by preferential oxidation of chloride ions with liberation of free chlorine during the second stage. It has been shown that electrodialysis can effectively solve the problem of comprehensive processing of neutral, alkaline, and acidic regenerative sulfate-chloride-containing solutions, with the production of alkali and acid at concentrations suitable for reuse in regeneration processes.</p>
</abstract>

The results of electrochemical processing of spent acidic, neutral, and alkaline sulfate-chloride-containing regenerative solutions in two- and three-chamber electrolyzers are presented. It has been determined that the highest current efficiency for the products of electrodialysis can be achieved in the presence of hardness ions when processing acidic sulfate-containing solutions using three-chamber electrolyzers. It has been established that during electrodialysis of alkaline solutions after regeneration of anionites containing chloride ions, accumulation of alkali occurs in the cathodic region, and in the anodic region, chloride ions accumulate due to diffusion through the anion exchange membrane during the first stage, followed by preferential oxidation of chloride ions with liberation of free chlorine during the second stage. It has been shown that electrodialysis can effectively solve the problem of comprehensive processing of neutral, alkaline, and acidic regenerative sulfate-chloride-containing solutions, with the production of alkali and acid at concentrations suitable for reuse in regeneration processes.

New Approaches to Comprehensive Electrochemical Processing of Sulfate-Chloride High-Mineralized Wastewater Treatment Residues

Department of Ecology and Technology of Plant Polymers

National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”

Automation Hardware and Software Department

Department of Heat-Physical Problems of Heat Supply Systems

Institute of Engineering Thermophysics of National Academy of Sciences

Department of Chemical, Polymer and Silicate Engineering

Architecture, Civil Engineering, Environment

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

The results of electrochemical processing of spent acidic, neutral, and alkaline sulfate-chloride-containing regenerative solutions in two- and three-chamber...

New Approaches to Comprehensive Electrochemical Processing of Sulfate-Chloride High-Mineralized Wastewater Treatment Residues

Published Online: Oct 20, 2023

Page range: 171 - 180

Received: Apr 25, 2023

Accepted: Jun 19, 2023

DOI: https://doi.org/10.2478/acee-2023-0044

Keywords
Electrochemical processing, Electrodialysis, Spent regenerant solutions, Sulfate-chloride solutions, Three-chamber electrolyzers, Anion membrane, Cation membrane

© 2023 Tetyana Shabliy et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

New Approaches to Comprehensive Electrochemical Processing of Sulfate-Chloride High-Mineralized Wastewater Treatment Residues

Published Online: Oct 20, 2023

Page range: 171 - 180

Received: Apr 25, 2023

Accepted: Jun 19, 2023

DOI: https://doi.org/10.2478/acee-2023-0044

KeywordsElectrochemical processing, Electrodialysis, Spent regenerant solutions, Sulfate-chloride solutions, Three-chamber electrolyzers, Anion membrane, Cation membrane

© 2023 Tetyana Shabliy et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Keywords
Electrochemical processing, Electrodialysis, Spent regenerant solutions, Sulfate-chloride solutions, Three-chamber electrolyzers, Anion membrane, Cation membrane