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Neutralization of Industrial Water by Electrodialysis
The process of non-reagent adjustment of the pH of a NaCl solution (0.5 g/L) of different acidity was investigated by the method of bipolar electrodialysis on a device operating according to the K-system (concentration). The experiments were carried out in the range pH = 2.0–12.0 with monopolar cati...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7911343/ https://www.ncbi.nlm.nih.gov/pubmed/33572584 http://dx.doi.org/10.3390/membranes11020101 |
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author | Petrov, Oleksandr Iwaszczuk, Natalia Kharebava, Tina Bejanidze, Irina Pohrebennyk, Volodymyr Nakashidze, Nunu Petrov, Anton |
author_facet | Petrov, Oleksandr Iwaszczuk, Natalia Kharebava, Tina Bejanidze, Irina Pohrebennyk, Volodymyr Nakashidze, Nunu Petrov, Anton |
author_sort | Petrov, Oleksandr |
collection | PubMed |
description | The process of non-reagent adjustment of the pH of a NaCl solution (0.5 g/L) of different acidity was investigated by the method of bipolar electrodialysis on a device operating according to the K-system (concentration). The experiments were carried out in the range pH = 2.0–12.0 with monopolar cation-exchange MK-40 (for alkaline solutions) or anion-exchange MA-40 (for acidic solutions) and bipolar MB-2 membranes. The regularities of the change in the pH of the solution on the current density, process productivity and energy consumption for the neutralization process have been investigated. Revealed: with different productivity of the apparatus (Q = 0.5–1.5 m(3/)h), in the range of pH 3.0–11.0, with an increase in the current density, a neutral pH value is achieved. It has been shown that at pH above 11.0 and below 3.0, even at high current densities (i > 20 A/m(2)), its value cannot be changed. This is due to the neutralization of the H(+) or OH(−) ions generated by the bipolar membrane by water ions, which are formed as a result of the dissociation of water molecules at the border of the monopolar membrane and the solution under conditions when the value of current exceeds the limiting value. |
format | Online Article Text |
id | pubmed-7911343 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-79113432021-02-28 Neutralization of Industrial Water by Electrodialysis Petrov, Oleksandr Iwaszczuk, Natalia Kharebava, Tina Bejanidze, Irina Pohrebennyk, Volodymyr Nakashidze, Nunu Petrov, Anton Membranes (Basel) Article The process of non-reagent adjustment of the pH of a NaCl solution (0.5 g/L) of different acidity was investigated by the method of bipolar electrodialysis on a device operating according to the K-system (concentration). The experiments were carried out in the range pH = 2.0–12.0 with monopolar cation-exchange MK-40 (for alkaline solutions) or anion-exchange MA-40 (for acidic solutions) and bipolar MB-2 membranes. The regularities of the change in the pH of the solution on the current density, process productivity and energy consumption for the neutralization process have been investigated. Revealed: with different productivity of the apparatus (Q = 0.5–1.5 m(3/)h), in the range of pH 3.0–11.0, with an increase in the current density, a neutral pH value is achieved. It has been shown that at pH above 11.0 and below 3.0, even at high current densities (i > 20 A/m(2)), its value cannot be changed. This is due to the neutralization of the H(+) or OH(−) ions generated by the bipolar membrane by water ions, which are formed as a result of the dissociation of water molecules at the border of the monopolar membrane and the solution under conditions when the value of current exceeds the limiting value. MDPI 2021-01-31 /pmc/articles/PMC7911343/ /pubmed/33572584 http://dx.doi.org/10.3390/membranes11020101 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Petrov, Oleksandr Iwaszczuk, Natalia Kharebava, Tina Bejanidze, Irina Pohrebennyk, Volodymyr Nakashidze, Nunu Petrov, Anton Neutralization of Industrial Water by Electrodialysis |
title | Neutralization of Industrial Water by Electrodialysis |
title_full | Neutralization of Industrial Water by Electrodialysis |
title_fullStr | Neutralization of Industrial Water by Electrodialysis |
title_full_unstemmed | Neutralization of Industrial Water by Electrodialysis |
title_short | Neutralization of Industrial Water by Electrodialysis |
title_sort | neutralization of industrial water by electrodialysis |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7911343/ https://www.ncbi.nlm.nih.gov/pubmed/33572584 http://dx.doi.org/10.3390/membranes11020101 |
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