Influence of operating parameters on water transport in electrodialysis

Kód výsledku v 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>

Výsledek na webu

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

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Influence of operating parameters on water transport in electrodialysis

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Influence of operating parameters on water transport in electrodialysis

Popis výsledku anglicky

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.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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