Membrane capacitive deionization-reverse electrodialysis hybrid system for improving energy efficiency of reverse osmosis seawater desalination

Choi, Jong-Moon; Oh, Yonghui; Chae, So-Ryong; Hong, Seungkwan

doi:10.1016/j.desal.2019.04.003

Cited by 77 publications

(34 citation statements)

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“…Even though membrane technology's advances, installation of energy recovery devices and use of more efficient pumps have well declined the energy to drive desalination over the last four decades [4][5][6], seawater reverse osmosis (SWRO) desalination remains an energy-intensive source of concentrate effluents assessing separately endogenous-e.g., RO configuration, water recovery rate, specific energy consumption and capacity-and exogenous-e.g., seawater conditions and electricity mix-factors relevant to the real RO desalination process, overlooking global variations. While these studies have provided insights on how (i) working conditions-concentration [13][14][15][16]18,[27][28][29], flow rate [15,16,28] and temperature [13,16,29] of feed solutions-(ii) configuration-i.e., RED acting as pre-and/or post-treatment to RO desalination [13,15,27]-and (iii) even the combination with other technologies to increase concentrate's salinity-e.g., membrane distillation [29], membrane capacitive deionization [18] and solar evaporation [14]-affect RED performance and, therefore, desalination SEC decrease and concentrate effluent dilution, consideration of all these factors at once has not yet been fully investigated and could pinpoint the appropriateness for full-scale RED implementation from the technical and environmental side. RED enables the harnessing of energy from abundant yet largely untapped sources, as industrial effluents, thus providing energy and emission savings from an otherwise waste stream, conforming with the waste-to-wealth concept.…”

Section: Introductionmentioning

confidence: 99%

“…RED enables the harnessing of energy from abundant yet largely untapped sources, as industrial effluents, thus providing energy and emission savings from an otherwise waste stream, conforming with the waste-to-wealth concept. Several authors have explored the energy retrieval from desalination concentrate effluents [9,[13][14][15][16][17][18], and secondary treated wastewater effluents [19][20][21][22], which bring higher power densities than the seawater/river water pair widely tested in previous works [19,[23][24][25]. While latest research advances have boosted the maturity level of RED, moving from lab-scale units to up-scaled prototypes and pilot plants [11,26], full-scale RED progress will require further techno-economic and environmental assessments and field demonstrations in industrially relevant environments that prove its practical viability.…”

Section: Introductionmentioning

confidence: 99%

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Reverse Electrodialysis: Potential Reduction in Energy and Emissions of Desalination

et al. 2020

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Salinity gradient energy harvesting by reverse electrodialysis (RED) is a promising renewable source to decarbonize desalination. This work surveys the potential reduction in energy consumption and carbon emissions gained from RED integration in 20 medium-to-large-sized seawater reverse osmosis (SWRO) desalination plants spread worldwide. Using the validated RED system’s model from our research group, we quantified the grid mix share of the SWRO plant’s total energy demand and total emissions RED would abate (i) in its current state of development and (ii) if captured all salinity gradient exergy (SGE). Results indicate that more saline and warmer SWRO brines enhance RED’s net power density, yet source availability may restrain specific energy supply. If all SGE were harnessed, RED could supply ~40% of total desalination plants’ energy demand almost in all locations, yet energy conversion irreversibility and untapped SGE decline it to ~10%. RED integration in the most emission-intensive SWRO plants could relieve up to 1.95 kg CO2-eq m−3. Findings reveal that RED energy recovery from SWRO concentrate effluents could bring desalination sector sizeable energy and emissions savings provided future advancements bring RED technology closer to its thermodynamic limit.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reverse Electrodialysis: Potential Reduction in Energy and Emissions of Desalination

et al. 2020

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“…Desalination systems with RED using desalination brine for recovering energy: (a) RO-RED scheme in which RED receives the SWRO brine and a secondary effluent; (b) RO-MD-RED scheme; (c) RO-MCDI-RED scheme; (d) ED-RED scheme; (e) ED-RED process integrated in single stack (four-channel repetitive unit, coupling an ED cell with an RED cell). Panels (a-e) are reproduced with permission from[424,[536][537][538][539] (adapted), respectively, all published by Elsevier, 2013, 2019, 2019, 2017 and 2020, respectively.…”

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confidence: 99%

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

et al. 2020

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This paper presents a comprehensive review of studies on electrodialysis (ED) applications in wastewater treatment, outlining the current status and the future prospect. ED is a membrane process of separation under the action of an electric field, where ions are selectively transported across ion-exchange membranes. ED of both conventional or unconventional fashion has been tested to treat several waste or spent aqueous solutions, including effluents from various industrial processes, municipal wastewater or salt water treatment plants, and animal farms. Properties such as selectivity, high separation efficiency, and chemical-free treatment make ED methods adequate for desalination and other treatments with significant environmental benefits. ED technologies can be used in operations of concentration, dilution, desalination, regeneration, and valorisation to reclaim wastewater and recover water and/or other products, e.g., heavy metal ions, salts, acids/bases, nutrients, and organics, or electrical energy. Intense research activity has been directed towards developing enhanced or novel systems, showing that zero or minimal liquid discharge approaches can be techno-economically affordable and competitive. Despite few real plants having been installed, recent developments are opening new routes for the large-scale use of ED techniques in a plethora of treatment processes for wastewater.

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“…Finally, an empirical equation to estimate the required membrane area of spiral-wound FO was proposed for the FO process design. The equation can be used to predict water recovery of FO systems as well, for example, if an FO system is operated at 0.08 m 2 L −1 h of the normalized membrane area, the system is expected to offer 78% of the R Th value.Membranes 2020, 10, 53 2 of 13 Moreover, emerging technologies such as forward osmosis, membrane distillation, and capacitive deionization have been explored for reducing energy consumption [6,7].Since the introduction of the ammonia-carbon-dioxide-based forward osmosis (FO) process in 2005, forward osmosis (FO) has attracted immense attention owing to its potential to reduce the energy for desalination [8][9][10][11]. Because the FO process extracts water through a semipermeable membrane by exploiting the natural osmotic pressure difference by using a concentrated draw solution (DS), the process requires small amounts of energy only to circulate the feed and draw solutions through the FO membrane modules [12,13].…”

mentioning

confidence: 99%

“…Membranes 2020, 10, 53 2 of 13 Moreover, emerging technologies such as forward osmosis, membrane distillation, and capacitive deionization have been explored for reducing energy consumption [6,7].…”

mentioning

confidence: 99%

Exploring the Operation Factors that Influence Performance of a Spiral-Wound Forward Osmosis Membrane Process for Scale-up Design

Lee

2020

Membranes

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Forward osmosis (FO) technology has increasingly attracted attention owing to its low operational energy and low fouling propensity. Despite extensive investigations on FO, very few module-scale FO studies on the operation and design of the FO process have been conducted. In this paper, a simple and practical FO process design parameter called normalized membrane area is suggested based on a performance analysis of spiral-wound FO elements. The influence of operation factors on operating pressures and water recovery was investigated using 8-inch spiral wound elements in the continuous operation mode. The membrane area was adjusted by series connection of FO elements to a maximum value of 46 m2 (three elements). The feed and draw flow rates were varied between 5 and 15 LPM under various feed (10, 20, and 30 g/L) and draw (58.4 and 233.8 g/L) concentration combinations. The analysis of flow rates (feed, draw, and permeate flow rates) indicated not only high flow channel resistance on the draw side but also high permeate flow rates can induce higher operating pressures owing to strong mutual interaction of the feed and the draw streams. Feed water recovery was focused on as a key performance index, and the experimental recovery (RExp) and theoretical maximum recovery (RTh) values were compared. The results revealed the significance of the feed flow rate and the membrane area in terms of enhancing the water recovery performance. In addition, a clear relationship was observed between the membrane area normalized by the initial feed flow rates and the water recovery ratio (RExp/RTh), even though the applied operation conditions were different. Finally, an empirical equation to estimate the required membrane area of spiral-wound FO was proposed for the FO process design. The equation can be used to predict water recovery of FO systems as well, for example, if an FO system is operated at 0.08 m2L−1h of the normalized membrane area, the system is expected to offer 78% of the RTh value.

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Membrane capacitive deionization-reverse electrodialysis hybrid system for improving energy efficiency of reverse osmosis seawater desalination

Cited by 77 publications

References 54 publications

Reverse Electrodialysis: Potential Reduction in Energy and Emissions of Desalination

Reverse Electrodialysis: Potential Reduction in Energy and Emissions of Desalination

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

Exploring the Operation Factors that Influence Performance of a Spiral-Wound Forward Osmosis Membrane Process for Scale-up Design

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