Influence of operating parameters on water transport in electrodialysis

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F28676092%3A_____%2F25%3AN0000020" target="_blank" >RIV/28676092:_____/25:N0000020 - isvavai.cz</a>

Result on the web

<a href="https://czemp.eu/wsp-2025/" target="_blank" >https://czemp.eu/wsp-2025/</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Influence of operating parameters on water transport in electrodialysis

Original language description

Electrodialysis employs an electric field applied across a stack of alternating cation- and anion-exchange membranes to separate salt solutions into concentrated and desalinated streams. In applications where a high concentration of the concentrate stream is required, such as the desalination of brackish water where lower brine discharge volumes reduce the cost of subsequent treatment1, water transport caused by osmosis and electro-osmosis, as well as ion back-diffusion, pose challenges. This work investigates the influence of several parameters on water transport in batch-mode electrodialysis with an applied voltage of 1 V per membrane pair. Water transport was evaluated as both the mass and molar ratio of transported water to transported salt. First, three temperatures and three solution concentrations were tested in the electrodialysis of Na₂SO₄ using heterogeneous IM-PES membranes. These factors did not show a measurable influence on water transport within the chosen ranges. Next, electrodialysis experiments with three different salts (Na₂SO₄, NaCl, and NaOH) were conducted using various types of ion-exchange membranes (heterogeneous membranes with different reinforcement textile thicknesses, and homogeneous Fumasep membranes). Both the salt type and the membrane type had a significant influence on water transport, with homogeneous membranes generally exhibiting more favorable properties, as expected.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20402 - Chemical process engineering

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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