Feasibility study of reverse osmosis–flow capacitive deionization (RO-FCDI) for energy-efficient desalination using seawater as the flow-electrode aqueous electrolyte

Chung, Hyun Jun; Kim, Jungbin; Kim, David Inhyuk; Gwak, Gimun; Hong, Seungkwan

doi:10.1016/j.desal.2020.114326

Cited by 40 publications

(13 citation statements)

References 40 publications

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“…The use of membranes in CDI helped develop the concept of flow-electrode, where active carbon particles circulate in an electrode compartment separated from the feed stream by IEMs [ 195 , 196 ]. Contrary to stationary electrodes which require a distinct regeneration/desorption step, having a flow electrode enables a continuous operating mode as carbon particles are constantly recycled which improve duration, effective ion removal and energy consumption of the process [ 197 , 198 ]. It is also possible to process higher salinity streams than when using static porous carbon electrodes [ 195 , 198 ].…”

Section: Recent Technological Developments Based On Ed Membrane Phmentioning

confidence: 99%

“…The superiority of ED compared to MCDI in terms of energy cost to reach deeper desalination and fouling/scaling control associated to smaller equipment explains why the former is usually preferred for coupling with RO [ 289 ]. To mitigate these issues, Chung et al [ 197 ] studied a small-scale RO-FCDI process for sea water desalination. The batch-mode implementation of FCDI in replacement of a second RO pass led to 95% removal while energy consumption (1.3 kWh/m³) was three-times higher than full-scale RO (<0.4 kWh/m³).…”

Section: Integration Of Ed Technologies In New Sustainable Strategmentioning

confidence: 99%

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Electrodialytic Processes: Market Overview, Membrane Phenomena, Recent Developments and Sustainable Strategies

Bazinet

Geoffroy

2020

Membranes

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In the context of preserving and improving human health, electrodialytic processes are very promising perspectives. Indeed, they allow the treatment of water, preservation of food products, production of bioactive compounds, extraction of organic acids, and recovery of energy from natural and wastewaters without major environmental impact. Hence, the aim of the present review is to give a global portrait of the most recent developments in electrodialytic membrane phenomena and their uses in sustainable strategies. It has appeared that new knowledge on pulsed electric fields, electroconvective vortices, overlimiting conditions and reversal modes as well as recent demonstrations of their applications are currently boosting the interest for electrodialytic processes. However, the hurdles are still high when dealing with scale-ups and real-life conditions. Furthermore, looking at the recent research trends, potable water and wastewater treatment as well as the production of value-added bioactive products in a circular economy will probably be the main applications to be developed and improved. All these processes, taking into account their principles and specificities, can be used for specific eco-efficient applications. However, to prove the sustainability of such process strategies, more life cycle assessments will be necessary to convince people of the merits of coupling these technologies.

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Section: Recent Technological Developments Based On Ed Membrane Phmentioning

confidence: 99%

Section: Integration Of Ed Technologies In New Sustainable Strategmentioning

confidence: 99%

Electrodialytic Processes: Market Overview, Membrane Phenomena, Recent Developments and Sustainable Strategies

Bazinet

Geoffroy

2020

Membranes

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“…Similar to (M)CDI, the most widely investigated application for FCDI lies in water desalination. One of the most significant advances of FCDI over fixed-electrode CDI is the possibility for desalination of higher salinity feeds due to the larger salt adsorption capacity of the flow-electrodes. ,,,,,, For instance, it has been reported that FCDI was able to remove ionic species from feedwater with total salt concentrations roughly equal to that of seawater . As mentioned in section , a number of cell configurations, electrode materials, and operational modes have been developed to achieve better desalination performances.…”

Section: Environmental Applications Of Fcdimentioning

confidence: 99%

“…Some potential areas include: Integration of FCDI with conventional technologies. FCDI could be potentially combined with RO, UF, ED, RED, or ion exchange systems to produce high-quality ultrapure water from seawater at lower energy consumption. ,, CO 2 capture. It has been shown that MCDI can be used to capture dissolved CO 2 gas without extra chemical consumption with FCDI expected to be even more effective in view of the ease of management of the electrode streams. − Dairy and beverage processing.…”

Section: Environmental Applications Of Fcdimentioning

confidence: 99%

Flow Electrode Capacitive Deionization (FCDI): Recent Developments, Environmental Applications, and Future Perspectives

Zhang

Lei

et al. 2021

Environ. Sci. Technol.

165

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With the increasing severity of global water scarcity, a myriad of scientific activities is directed toward advancing brackish water desalination and wastewater remediation technologies. Flow-electrode capacitive deionization (FCDI), a newly developed electrochemically driven ion removal approach combining ion-exchange membranes and flowable particle electrodes, has been actively explored over the past seven years, driven by the possibility of energy-efficient, sustainable, and fully continuous production of high-quality fresh water, as well as flexible management of the particle electrodes and concentrate stream. Here, we provide a comprehensive overview of current advances of this interesting technology with particular attention given to FCDI principles, designs (including cell architecture and electrode and separator options), operational modes (including approaches to management of the flowable electrodes), characterizations and modeling, and environmental applications (including water desalination, resource recovery, and contaminant abatement). Furthermore, we introduce the definitions and performance metrics that should be used so that fair assessments and comparisons can be made between different systems and separation conditions. We then highlight the most pressing challenges (i.e., operation and capital cost, scale-up, and commercialization) in the full-scale application of this technology. We conclude this state-of-the-art review by considering the overall outlook of the technology and discussing areas requiring particular attention in the future.

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“…Hybrid desalination systems that use sequentially coupled high salt rejection membrane (NF and RO) and CDI-based processes (MCDI and FCDI) are attracting more attention [ 76 , 77 ]. As standalone CDI possesses a relatively low salt removal rate in desalting highly saline water >3000 mg/L [ 69 , 76 ], NF and RO could play an important role in providing feed water quality suitable for CDI.…”

Section: Electrochemical Cellsmentioning

confidence: 99%

Membrane and Electrochemical Processes for Water Desalination: A Short Perspective and the Role of Nanotechnology

2020

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In the past few decades, membrane-based processes have become mainstream in water desalination because of their relatively high water flux, salt rejection, and reasonable operating cost over thermal-based desalination processes. The energy consumption of the membrane process has been continuously lowered (from >10 kWh m−3 to ~3 kWh m−3) over the past decades but remains higher than the theoretical minimum value (~0.8 kWh m−3) for seawater desalination. Thus, the high energy consumption of membrane processes has led to the development of alternative processes, such as the electrochemical, that use relatively less energy. Decades of research have revealed that the low energy consumption of the electrochemical process is closely coupled with a relatively low extent of desalination. Recent studies indicate that electrochemical process must overcome efficiency rather than energy consumption hurdles. This short perspective aims to provide platforms to compare the energy efficiency of the representative membrane and electrochemical processes based on the working principle of each process. Future water desalination methods and the potential role of nanotechnology as an efficient tool to overcome current limitations are also discussed.

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Feasibility study of reverse osmosis–flow capacitive deionization (RO-FCDI) for energy-efficient desalination using seawater as the flow-electrode aqueous electrolyte

Cited by 40 publications

References 40 publications

Electrodialytic Processes: Market Overview, Membrane Phenomena, Recent Developments and Sustainable Strategies

Electrodialytic Processes: Market Overview, Membrane Phenomena, Recent Developments and Sustainable Strategies

Flow Electrode Capacitive Deionization (FCDI): Recent Developments, Environmental Applications, and Future Perspectives

Membrane and Electrochemical Processes for Water Desalination: A Short Perspective and the Role of Nanotechnology

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