Salinity gradient power from synthetic river water, brackish water, seawater and brine by reverse electrodeionization
Avci, Ahmet Halil LU and Lipnizki, Frank LU
(2025)
In Electrochimica Acta
537.
- Abstract
The power extracted by reverse electrodialysis (RED) is often limited by the high resistance of low concentration compartment. This work aims to address this issue by demonstrating a reverse electrodeionization (REDI) design that can facilitate the ion transport and alleviate so called spacer shadow effects. In total, three different stack designs were assembled by substituting the conventional spacers with ion exchange resins and tested with river and seawater. Applying anion, cation and mixed ion exchange resins favoured the cation exchange resin 50WX8 resulting in 71% lower resistance. To gain a broader understanding of the advantages of the new REDI design, brackish water and seawater were tested as low concentration compartments in... (More)
The power extracted by reverse electrodialysis (RED) is often limited by the high resistance of low concentration compartment. This work aims to address this issue by demonstrating a reverse electrodeionization (REDI) design that can facilitate the ion transport and alleviate so called spacer shadow effects. In total, three different stack designs were assembled by substituting the conventional spacers with ion exchange resins and tested with river and seawater. Applying anion, cation and mixed ion exchange resins favoured the cation exchange resin 50WX8 resulting in 71% lower resistance. To gain a broader understanding of the advantages of the new REDI design, brackish water and seawater were tested as low concentration compartments in addition to river water, while reverse osmosis brine and hypersaline brine were used in the high concentration compartment alongside seawater. The findings showed that the gross power density and the pump power consumption increased together when resins were introduced. Therefore, REDI design was only favourable when the gained power density was higher than the increase in pressure drops in compartments. In this regard, REDI was beneficial compared to RED when resins were loaded only in the low concentration compartment and under certain salinity gradients. For example, it was possible to obtain 5.3 times more net power density in REDI design for river water and seawater mixing when low concentration compartment loaded with resins whereas loading resin in the high concentration compartment did not produce positive net power.
(Less)
- author
- Avci, Ahmet Halil
LU
and Lipnizki, Frank
LU
- organization
- publishing date
- 2025-10-10
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- ion exchange resin, reverse electrodeionization, Reverse electrodialysis, river water, seawater, spacerless design
- in
- Electrochimica Acta
- volume
- 537
- article number
- 146873
- publisher
- Elsevier
- external identifiers
-
- scopus:105010181158
- ISSN
- 0013-4686
- DOI
- 10.1016/j.electacta.2025.146873
- project
- Harvesting of Blue energy using Swedish natural and artificial resources
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2025
- id
- 924dfc67-75e8-4ef1-a660-59ca900303c3
- date added to LUP
- 2025-07-27 10:07:56
- date last changed
- 2025-08-12 12:45:43
@article{924dfc67-75e8-4ef1-a660-59ca900303c3,
abstract = {{<p>The power extracted by reverse electrodialysis (RED) is often limited by the high resistance of low concentration compartment. This work aims to address this issue by demonstrating a reverse electrodeionization (REDI) design that can facilitate the ion transport and alleviate so called spacer shadow effects. In total, three different stack designs were assembled by substituting the conventional spacers with ion exchange resins and tested with river and seawater. Applying anion, cation and mixed ion exchange resins favoured the cation exchange resin 50WX8 resulting in 71% lower resistance. To gain a broader understanding of the advantages of the new REDI design, brackish water and seawater were tested as low concentration compartments in addition to river water, while reverse osmosis brine and hypersaline brine were used in the high concentration compartment alongside seawater. The findings showed that the gross power density and the pump power consumption increased together when resins were introduced. Therefore, REDI design was only favourable when the gained power density was higher than the increase in pressure drops in compartments. In this regard, REDI was beneficial compared to RED when resins were loaded only in the low concentration compartment and under certain salinity gradients. For example, it was possible to obtain 5.3 times more net power density in REDI design for river water and seawater mixing when low concentration compartment loaded with resins whereas loading resin in the high concentration compartment did not produce positive net power.</p>}},
author = {{Avci, Ahmet Halil and Lipnizki, Frank}},
issn = {{0013-4686}},
keywords = {{ion exchange resin; reverse electrodeionization; Reverse electrodialysis; river water; seawater; spacerless design}},
language = {{eng}},
month = {{10}},
publisher = {{Elsevier}},
series = {{Electrochimica Acta}},
title = {{Salinity gradient power from synthetic river water, brackish water, seawater and brine by reverse electrodeionization}},
url = {{http://dx.doi.org/10.1016/j.electacta.2025.146873}},
doi = {{10.1016/j.electacta.2025.146873}},
volume = {{537}},
year = {{2025}},
}