pH Changes at Anion Selective Membranes under Realistic Flow Conditions

Kressman, T. R. E.; Tye, F. L.

doi:10.1149/1.2411750

Cited by 23 publications

(6 citation statements)

References 30 publications

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“…This was explained by the presence of convection near the surface of the CEM, improving the ion transfer and hampering water dissociation [ 8 , 21 , 30 , 33 ]. Another explanation of the preferable water splitting near the AEM is the nature of the membrane ion-exchange groups, which play a crucial role in generation of H + and OH − ions, since water dissociation at the IEM interface occurs via interactions with membrane ion-exchange groups [ 30 , 34 , 35 , 36 ]. Hence, Simons showed a significant acceleration of water dissociation reaction by catalysis with ion-exchange groups and that this reaction, with tertiary amino groups, was limited by the reaction stage BH + + H 2 O

B + H 3 O + with a rate constant k lim > 2.5 s −1 [ 35 ].…”

Section: Membrane Phenomenamentioning

confidence: 99%

“…According to this classification, using CEM with sulfo groups and AEM with tertiary amino groups the water splitting rate will be 3-orders higher on AEM. Furthermore, acceleration of H + and OH − generation was observed in ED systems containing inorganic ions and hydroxides or organic substances, which are able to precipitate on ion-exchange groups [ 34 , 38 , 39 , 40 ].…”

Section: Membrane Phenomenamentioning

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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B + H 3 O + with a rate constant k lim > 2.5 s −1 [ 35 ].…”

Section: Membrane Phenomenamentioning

confidence: 99%

Section: Membrane Phenomenamentioning

confidence: 99%

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

Bazinet

Geoffroy

2020

Membranes

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“…Numerous studies carried-out on anion-exchange membranes (AEM) [9][10][11][12][13][14][15] reported that these membranes are the most affected membrane by fouling phenomena. However the influence of magnesium in solution on AEM fouling has never been studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnesium/calcium ratios in solutions treated by electrodialysis: Morphological characterization and identification of anion-exchange membrane fouling

Casademont

Pourcelly

Bazinet

2008

Journal of Colloid and Interface Science

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“…The degree of fouling occurs in ED and EDR depends on the type of membrane used and the quantity and quality of organic colloids carry in feed water. For example, organic colloid 0.03 mg/L in feed water is dangerous to the anionic membrane in ED and EDR [52,53]. Current reversal and mechanical cleaning of the membrane surface cleared for only a short of period because the voltage raising to its original value before reversal and/or mechanical cleaning instantaneously as high as it had been before reversal and cleaning.…”

Section: Foulingmentioning

confidence: 99%

Design of ILEDR for brackish groundwater: A literature review approach

Myint¹,

Ghassemi²,

Nirmalakhandan³

2010

Desalination and Water Treatment

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A literature review was done in details in desalination by using electrodialysis reversal (EDR). All available data -source of water entered into pretreatment and/or directly into EDR, physicochemical characteristics of water, targeted pollutants, methods and the reasons for the pretreatments, specifications used of EDRs, developments/improvements in EDR, fouling causing compounds and methods to control fouling, membrane types, membrane assembly, spacer, and concentrate management, method, and recovering of ions were searched and summarized in Tables 1-3. From the tables, the concentrations profiles of the targeted pollutants were observed in different sub-processes (i.e., pretreatment, ERD dilute and concentrate streams). The percentage removals of individual ion from different literatures were compared. The concentrations of fouling causing compounds (for examples, CaSO 4 and MgSO 4 ) in concentrated streams were eliminated by individual separation process with the specific different types of permselective membranes in four different stages. All these summarized data were used as tools, references, and comparisons to design and select the sub-processes in ILEDR project to treat the brackish groundwater into the drinking water. Design includes designs I (using a single type of membrane pair) and II (using four different types of mono-and di-valent permselective membrane). Permselective membrane design shows 7% cost saving while comparing to the single type of membrane design with the same water recovery rate, the same demineralization rate, and the same membrane life. The saving increases up to 15-18% if membrane life is considered in the design.self-cleaning by reversal the chemical reactions, electricity driving force, and the flows. The effectiveness of current-reversal process of EDR are shattering and detaching polarization films four times/hour to prevent polarization scale; contravention up freshly precipitated scale or seeds of scale and flushing them back into waste stream before they can cause scratch to membrane; reducing slime formations on membrane surface; reducing problems associated with the use of chemicals; cleaning electrodes with acid automatically during alternative anodic operation [4] in reversal. There is a period (1-2 min [4]) instantaneously following the polarity reversal, the waters from both dilute and concentrate are required to send back to the feed stream or diverted to waste because these waters are ''off specification''.EDR efficiency depends on method to prevent membrane from fouling; ion's charge and mobility, solution conductivity, relative concentrations, applied voltage, and the characteristics of the ion-exchange membranes, especially its permselectivity [5]; system design [6,1]; materials used in membrane [7].EDR is not cost effective at plant capacity lower the 40 m 3 /h while comparing with R.O; Elyanow and Persechino recommended that high recovery (94%), elevated SDI (6-12), potential for biofouling, hard-totreat, high hardness, lower salinity waters (from 200 to 5,000...

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pH Changes at Anion Selective Membranes under Realistic Flow Conditions

Cited by 23 publications

References 30 publications

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

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

Effect of magnesium/calcium ratios in solutions treated by electrodialysis: Morphological characterization and identification of anion-exchange membrane fouling

Design of ILEDR for brackish groundwater: A literature review approach

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