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Salinity gradient power from synthetic river water, brackish water, seawater and brine by reverse electrodeionization

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Title: Salinity gradient power from synthetic river water, brackish water, seawater and brine by reverse electrodeionization
Authors: Avci, Ahmet Halil, Lipnizki, Frank
Contributors: Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: The Energy Transition, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Energiomställningen, Originator, Lund University, Faculty of Engineering, LTH, Departments at LTH, Department of Process and Life Science Engineering, Division of Chemical Engineering, Lunds universitet, Lunds Tekniska Högskola, Institutioner vid LTH, Institutionen för processteknik och tillämpad biovetenskap, Avdelningen för kemiteknik, Originator, Lund University, Faculty of Engineering, LTH, Departments at LTH, Department of Process and Life Science Engineering, Lunds universitet, Lunds Tekniska Högskola, Institutioner vid LTH, Institutionen för processteknik och tillämpad biovetenskap, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Food and Bio, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Livsmedel och bioteknik, Originator, Lund University, Faculty of Engineering, LTH, LTH Profile areas, LTH Profile Area: Water, Lunds universitet, Lunds Tekniska Högskola, LTH profilområden, LTH profilområde: Vatten, Originator
Source: Electrochimica Acta. 537
Subject Terms: Engineering and Technology, Chemical Engineering, Teknik, Kemiteknik
Description: 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.
Access URL: https://doi.org/10.1016/j.electacta.2025.146873
Database: SwePub
Description
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 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.
ISSN:00134686
DOI:10.1016/j.electacta.2025.146873