A mechanistic model for salt and water transport in leaky membranes: Implications for low-salt-rejection reverse osmosis membranes

Du, Yuhao; Wang, Li; Belgada, Abdessamad; Younssi, S. Alami; Gilron, Jack; Elimelech, Menachem

doi:10.1016/j.memsci.2023.121642

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…68,69 In the development of new RO-based desalination processes, like low-salt-rejection RO (LSRRO), 70 the reflection coefficient is crucial for characterizing the transport of “leaky” membranes. 71 Overall, the irreversible thermodynamic models remain invaluable for investigating membrane transport and devising practical applications.…”

Section: Irreversible Thermodynamics-based Modelsmentioning

confidence: 99%

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Mechanisms and models for water transport in reverse osmosis membranes: history, critical assessment, and recent developments

Heiranian,

Fan,

Wang

et al. 2023

Chem. Soc. Rev.

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Section: Irreversible Thermodynamics-based Modelsmentioning

confidence: 99%

“…Note that eqn (7.2) does not consider the effect of pressure as salt ions are assumed to be point charges and their contribution to the total volume flux is negligible. 48,71…”

Section: Solution–friction Modelmentioning

confidence: 99%

Mechanisms and models for water transport in reverse osmosis membranes: history, critical assessment, and recent developments

Heiranian,

Fan,

Wang

et al. 2023

Chem. Soc. Rev.

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“…Usually, the operating pressure in the membrane‐based separation processes is limited by the design of the spiral wound membrane (SWM) module (Koutsou et al, 2013). As a result, hypersaline brines cannot be effectively treated through high salt rejection membranes due to very high osmotic pressures, whereas LSR membranes exhibit higher salt permeability and allow for greater passage of salts through them, which in turn reduces the osmotic pressure and enables the effective treatment of hypersaline brines using multi‐pass systems (Du et al, 2023; Gerrald, 2023). An alternative to LSR membranes is the nanofiltration (NF) membranes (Adam et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Multi‐dimensional parametric study for enhancing Brackish Water Reverse Osmosis membrane performance suited for desalination of low salinity feeds

Thummar,

Amaliar,

Sutariya

et al. 2024

Water Environment Research

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Reverse osmosis (RO) effectively provides clean drinking water. Different RO membrane types are tailored to treat saline water feeds with varying characteristics. In the context of low brackish water feeds, the objective is to remove only a minimal excess of salinity through the membrane. Our study introduces a method of membrane post‐treatments capable of achieving controlled salt rejection while concurrently enhancing permeate flux, which is vital for achieving effective and energy‐efficient desalination of low brackish water. The post‐treatments were conducted on our in‐house‐developed membranes using aqueous solutions of N,N‐Dimethylformamide and glycerol for different drying times at the coupon level. The process was scaled up at the module level, allowing us to assess its potential for commercial application. At the coupon level, the permeate flux increased significantly from 3.7 ± 0.9 to 10.6 ± 0.2 L/m2·h·bar, while the salt rejection decreased from 95.6 ± 1% to 70.5 ± 1% when measured with a feed of 2,000 ppm NaCl concentration. At the module level, we observed a higher flux of 12.8 L/m2·h·bar, alongside a salt rejection of 55.5% with a similar feed. Varying post‐treatment parameters at the coupon level allowed us to attain the desired salt rejection and permeate flux values. Physical changes in both pristine and post‐treated membranes, including polymer swelling, were observed without chemical alterations, enhancing our understanding of the post‐treatment effect and its potential for broader commercial use.Practitioner Points Post‐treatment of RO membranes enhances flux. Physical structuring through polymer swelling was observed with the chemical structure unaltered. Post‐treatment of RO opens doors for broader energy‐efficient desalination application.

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Zwitterion Modification in Desalination Membrane for Rejecting Salt and Salt Ions in Brackish Water – A Mini Review

Ratnasari,

Tangahu,

Yuniarto

et al. 2024

Environmental Quality Mgmt

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Desalination membrane using zwitterion modification provides a significant opportunity to enhance excellent properties for rejecting salt and salt ions. The outstanding properties are designed by positive and negative charges attached to the membrane surface, including water permeability, salt permeability, fouling, and hydrophilicity of the membrane surface. The hydrophilic membrane, which is mentioned as one of the types of desalination membrane, presents the ability to repel salt and salt ions and pass the water. The modification of hydrophilic membranes is also affected by several factors, including water permeability, salt permeability, fouling of membrane surfaces, crossflow velocity, transmembrane pressure, and temperature. Regarding membrane modification, zwitterion has been applied for several ranges, such as the hemodialysis process, live cell imaging, antibacterial surfaces, and wound dressing. However, using a zwitterion modification membrane for desalinating water containing salt content, including brackish water, has yet to be developed. In addition, literature reviews related to polymer membranes for brackish water desalination have never been comprehensively documented. Thus, this review article addresses the zwitterion modification for desalination membranes, which can reject salt and salt ions in brackish water. Furthermore, the mechanism of zwitterion modification for desalination membranes has been presented. Finally, the challenge of zwitterion modification for desalination membranes has been evaluated to inspire insight for future studies.

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A mechanistic model for salt and water transport in leaky membranes: Implications for low-salt-rejection reverse osmosis membranes

Cited by 11 publications

References 47 publications

Mechanisms and models for water transport in reverse osmosis membranes: history, critical assessment, and recent developments

Mechanisms and models for water transport in reverse osmosis membranes: history, critical assessment, and recent developments

Multi‐dimensional parametric study for enhancing Brackish Water Reverse Osmosis membrane performance suited for desalination of low salinity feeds

Zwitterion Modification in Desalination Membrane for Rejecting Salt and Salt Ions in Brackish Water – A Mini Review

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