Salinity gradient energy conversion by custom-made interpolymer ion exchange membranes utilized in reverse electrodialysis system

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Date

2023

Authors

Güler, Enver
Kaya, Tugce Zeynep
Smolinska-Kempisty, Katarzyna
Guler, Enver
Kabay, Nalan
Tomaszewska, Barbara
Bryjak, Marek

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Elsevier Sci Ltd

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Chemical Engineering
(2010)
Established in 2010, and aiming to train the students with the capacity to meet the demands of the 21st Century, the Chemical Engineering Department provides a sound chemistry background through intense coursework and laboratory practices, along with fundamental courses such as Physics and Mathematics within the freshman and sophomore years, following preparatory English courses.In the final two years of the program, engineering courses are offered with laboratory practice and state-of-the-art simulation programs, combining theory with practice.

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Abstract

Reverse electrodialysis (RED) is one of methods to extract salinity gradient energy between two aqueous solu-tions with different salt concentrations. In this work, custom-made interpolymer ion exchange membranes were employed in the RED stack. The effects of divalent (Mg2+, Ca2+ , SO42-) and monovalent (Li+, K+ and Cl-) ions in the feed solutions prepared from NaCl salt as a function of such process parameters as number of membrane pairs, flow rate , salinity ratio on power generation by the RED method were studied. It was shown that the maximum power density of 0.561 W/m2 was reached by using three membrane pairs using 1:45 of salt ratio with a feed flow rate of 120 mL/min using only NaCl salt in the feed solutions. The maximum power density was 0.398 W/m2 at 120 mL/min of the flow rate of the feed solutions composed of 90 wt% NaCl and 10 wt% KCl by using a salt ratio of 1:30 while the lowest power density of 0.246 W/m2 was obtained with a feed flow rate of 30 mL/min in the presence of SO42-ions with a similar salt ratio. Consequently, it was seen that while the presence of divalent ions in NaCl solutions had negative impact on power generation by RED system, the addition of monovalent ions having smaller hydrated radius than that of the Na+ ions contributed positively to the power generation.

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Altıok, Esra/0000-0001-5229-4766; Güler, Enver/0000-0001-9175-0920; Smolinska-Kempisty, Katarzyna/0000-0002-7894-8198; Tomaszewska, Barbara/0000-0002-4780-1580

Keywords

Blue energy, Interpolymer ion exchange membrane, Reverse electrodialysis (RED), Salinity gradient energy

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3

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11

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2

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