Analysis of an underlimiting and overlimiting current regime in a single electrodialysis channel

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F24%3A43931357" target="_blank" >RIV/60461373:22340/24:43931357 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23640/24:43972155

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0011916424002492?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0011916424002492?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.desal.2024.117538" target="_blank" >10.1016/j.desal.2024.117538</a>

Result language

angličtina

Original language name

Analysis of an underlimiting and overlimiting current regime in a single electrodialysis channel

Original language description

Overlimiting ionic transfer is considered a mechanism to intensify transport processes in electrodialysis, potentially providing a smaller required footprint of electromembrane units. However, its applicability in desalination is still questionable. To address this aspect of electrodialysis, we characterized desalination in a single-channel electrodialysis unit operated under various current densities, yielding various diluate desalination degrees. Our analysis revealed that the conditions providing &lt;100 % desalination were pertinent to an underlimiting regime with no indication of overlimiting processes. Specifically, no (electro-) convective structures intensifying ionic transfer occurred in the channel under these conditions. Applying electric current densities yielding theoretical desalination larger than 100 % significantly increased the necessary voltage, driving electroconvective vortices. The observation suggested that overlimiting phenomena occur upon setting conditions corresponding to complete desalination and, thus, do not positively contribute to desalination. Notably, the partial loss of membrane ion selectivity was associated with an operation in the overlimiting regime, worsening desalination efficiency. Our results imply that the overlimiting regime is, at least with the tested membranes, unsuitable for enhancing ionic transfer. Conversely, the small voltage required to remove ions in the underlimiting regime was attributed to the effect of natural convection, which readily occurs in the model system. © 2024 Elsevier B.V.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

<a href="/en/project/GA20-21263S" target="_blank" >GA20-21263S: Analysis of electrodialysis in milifluidic flow-through systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

DESALINATION

ISSN

0011-9164

e-ISSN

1873-4464

Volume of the periodical

580

Issue of the periodical within the volume

117538

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

10

Pages from-to

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UT code for WoS article

001215598600001

EID of the result in the Scopus database

2-s2.0-85188673343