Optimization of the reverse electrodialysis power output through the ratio of the feed solutions salinity

Zoungrana, Ali; Çakmakçı, Mehmet

doi:10.1049/rpg2.12066

Cited by 8 publications

(2 citation statements)

References 28 publications

(65 reference statements)

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“…Ref. [161] adds that even though RED is among the highest energy efficiency techniques, it also has a low EROI, without providing any further clues.…”

Section: Salinity Gradientmentioning

confidence: 99%

Examining the Potential of Marine Renewable Energy: A Net Energy Perspective

et al. 2023

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It is often claimed that marine renewable energy alone could meet the electricity demand of current and future human societies. However, such claims are based on highly uncertain estimations of the global potentials of marine renewable energy sources (including tidal, ocean currents, wave, offshore wind and salinity and thermal gradients), and do not take into account the embedded energy of current technologies. To better understand the effective potential of marine energy, we conducted a literature review of its gross, technical, economic and sustainable potentials, as well as the energy return on investment (EROI), and estimated the net energy potential. We found that all marine technologies could provide a maximum energy surplus of 57,000 TWh/yr. This figure goes down to ∼5000TWh/yr when excluding offshore wind. The previous figures do not include the contribution from ocean currents, for which no reliable estimates of global potentials and EROIs could be obtained. Due to its high upfront costs and environmental impacts and low social acceptance, no additional tidal range capacity expansion is envisioned. Similarly, the combination of a low sustainable potential and the low EROI makes the large-scale exploitation of salinity gradients unlikely with current technologies. Including all technologies, the average EROI of marine energy is ∼20, but excluding offshore wind reduces the average EROI to ∼8. While we did consider sustainability constraints for some marine energy sources, our estimation of marine net energy potential primarily relied on technical factors and did not account for economic and legal constraints. Therefore, the results presented here should be interpreted as an upper bound for the actual net energy contribution of marine energy sources to the global energy mix.

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“…Ref. [161] adds that even though RED is among the highest energy efficiency techniques, it also has a low EROI, without providing any further clues.…”

Section: Salinity Gradientmentioning

confidence: 99%

Examining the Potential of Marine Renewable Energy: A Net Energy Perspective

et al. 2023

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“…Research indicates that the application of an electric field can reduce membrane fouling and improve the permeate flux in RO processes [30][31][32]. Simultaneously, enhancing the water inlet pressure and flow rate, without damaging ion-exchange membranes, can improve the mass transfer efficiency in ED [33]. To address these issues, building on previous research, a proposed approach involves integrating RO and ED into a single device.…”

Section: Introductionmentioning

confidence: 99%

Performance Study on Brackish Water Desalination Efficiency Based on a Novel Coupled Electrodialysis–Reverse Osmosis (EDRO) System

Fu,

Li,

et al. 2024

Water

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Reverse osmosis (RO) is a commonly used desalination technology, but due to high requirements concerning the quality of the feed water, there still exists permeate flux related to the operating conditions, and the solute removal rate is low. Electric fields have a facilitating effect on RO desalination performance. Previous studies have focused on investigating the combination of RO and electrodialysis (ED) processes separately, without directly exploiting their interactions. To address this issue, this study proposes a novel coupling device that combines both RO and ED technologies in a single unit and investigates their mutual enhancement effects on brackish water desalination. The results show that the coupled EDRO system can mutually enhance the performance of RO and ED processes. The permeate flux ratio of the RO membrane increased with increasing voltage, reaching a maximum value of 23.7% at a feed concentration of 10,000 mg/L. The solute rejection by the ion-exchange membrane also increased with increasing pressure, reaching a maximum value of 14.95% at the same feed concentration. In addition, the specific energy consumption of the coupled system was also reduced compared to a standalone operation, with maximum reductions of 9.5% and 19.2% for RO and 2.5% and 3.4% for ED at 5000 and 10,000 mg/L feed concentrations, respectively.

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