The averaged potential gradient approach to model the rejection of electrolyte solutions using nanofiltration: Model development and assessment for highly concentrated feed solutions

Thibault, Karim; Zhu, Haochen; Szymczyk, Anthony; Li, Guang Ming

doi:10.1016/j.seppur.2015.08.041

Cited by 12 publications

(12 citation statements)

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“…The effective charge density is widely determined by means of electro-kinetic measurements [1,3,29,32,43,45,46]. The tangential streaming potential technique is defined as the measurement of the electrical potential difference at zero applied current, generated when a hydrodynamic pressure is applied to the electrolyte solution forcing it to flow through a capillary channel [20,25,34].…”

Section: Mass Balancesmentioning

confidence: 99%

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Phenomenological prediction of desalination brines nanofiltration through the indirect determination of zeta potential

Ortiz–Albo

Ibáñez

Urtiaga

et al. 2019

Separation and Purification Technology

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The prediction of nanofiltration (NF) performance at environmentally relevant conditions, e.g.: highly saline brine solutions, is becoming of increasing interest for the recovery of waste materials in the water desalination industry. In this work, the prediction of the separation of sulfate and chloride contained in the retentate of reverse osmosis brackish water desalination by means of the commercial NF270 membrane is studied.Prior to theoretical modelling, streaming potential measurements were performed for aqueous single and binary mixtures of NaCl and Na 2 SO 4 within the range of ionic strengths 0.001-0.1 M. Zeta potential values were obtained applying an extrapolation method from recent literature to allow the calculation of surface charge density under higher ionic strengths found in reverse osmosis desalination brines (0.1 to 1.2 M). The obtained surface charge density was then used to simulate sulfate, chloride and sodium rejections by means of the Donnan steric pore model (DSPM), in the pressure range 2 -20 bar. The good agreement between experimental and simulated rejection values allows to validate this approach that enables the prediction of NF performance for the separation of monovalent and divalent anions, of interest for the purification of desalination brines before their further exploitation as a source of sodium chloride concentrated solutions.

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Section: Mass Balancesmentioning

confidence: 99%

“…With regard to the use of the ENP equation, different phenomena have been included in order to achieve greater accuracy and predictive capability giving rise to a number of suitable models, which mainly differ in their strictness and complexity [18,19,[25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Phenomenological prediction of desalination brines nanofiltration through the indirect determination of zeta potential

Ortiz–Albo

Ibáñez

Urtiaga

et al. 2019

Separation and Purification Technology

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“…Considerable effort has been devoted to nanofiltration (NF) modelling and several approaches can be found in the literature [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Nonetheless, the intricacy of the transport mechanisms of NF complicates the development of predictive models, in particular for multielectrolyte solutions containing both mono and divalent ions.…”

Section: Introductionmentioning

confidence: 99%

“…In general, there are two kinds of transport models of NF: mechanistic models and irreversible thermodynamics descriptions [ 1 ]. The former usually use the concept of nanoporous materials in which ion exclusion (steric, electric and dielectric) and hindered diffusion and convection occur [ 2 , 6 ]. These models are based on macroscopic approaches probably applicable for the description of ultrafiltration but questionable if applied to subnanopores.…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration of Multi-Ion Solutions: Quantitative Control of Concentration Polarization and Interpretation by Solution-Diffusion-Electro-Migration Model

Labastida

Yaroshchuk

2021

Membranes

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For effective use of advanced engineering models of nanofiltration quality of experimental input is crucial, especially in electrolyte mixtures where simultaneous rejections of various ions may be very different. In particular, this concerns the quantitative control of concentration polarization (CP). This work used a rotating disklike membrane test cell with equally accessible membrane surface, so the CP extent was the same over the membrane surface. This condition, which is not satisfied in the conventional membrane test cell, made possible correcting for CP easily even in multi-ion systems. Ion rejections were studied experimentally for several dominant salts (NaCl, MgCl2, Na2SO4 and MgSO4) and trace ions (Na+, NH4+, Cl− and NO3−) using NF270 membrane. The solution–diffusion–electro–migration model was used to obtain ion permeances from the experimental measurements. The model could well fit the experimental data except in the case of NH4+. The correlations between the ion permeances and type of dominant salt are discussed in the context of the established mechanisms of NF such as Donnan and dielectric exclusion. The obtained information contributes to the systematic transport characterization of NF membranes and may be ultimately useful for computational fluid dynamics simulations of the performance of the membranes in various applications.

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“…As reviewed recently by Wang et al various NF models still coexist [7]. Basically, some models [8][9][10][11] use a nanopore assumption for the membrane structure to describe the behavior of ions inside the membrane, while others [12][13][14][15] postulate that there are no permanent nanopores inside the membrane.…”

Section: Introductionmentioning

confidence: 99%

Rejection of ammonium and nitrate from sodium chloride solutions by nanofiltration: Effect of dominant-salt concentration on the trace-ion rejection

Reig

Licon

Gibert

et al. 2016

Chemical Engineering Journal

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In this work, the rejection of two ions associated with fertilizer pollution of ground water (NH4and NO3) by a polyamide nanofiltration (NF270) membrane was studied. Sodium chloride was selected as the dominant salt and the effect of its concentration on the NH4 and NO3 rejections was evaluated. Filtration experiments were carried out in a cross-flow setup with a rectangular spacer-filled feed channel. The solution-diffusion-electro-migration-film model (SDEFM), previously developed to model the pressure-driven trans-membrane transfer of electrolyte mixtures consisting of a single dominant salt and (any number of) trace ions, was used to obtain membrane ion permeance from the experimental data. In this way, the membrane permeances with respect to single ions (Na,Cl,NH4,NO3) were obtained for various concentrations of both dominant (0.05–0.3 M NaCl) and trace salts (0.001–0.003 M NH4Cl/NaNO3). It was observed that when the dominant salt concentration increased, the rejections of dominant salt and trace ions decreased, whereas the membrane permeances to ions increased. This information can be useful for developing design tools for nanofiltration of mixed electrolyte solutions in water-treatment applications.Peer ReviewedPostprint (author's final draft

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The averaged potential gradient approach to model the rejection of electrolyte solutions using nanofiltration: Model development and assessment for highly concentrated feed solutions

Abstract: . The averaged potential gradient approach to model the rejection of electrolyte solutions using nanofiltration: Model development and assessment for highly concentrated feed solutions. Separation and Purification Technology, Elsevier, 2015, 153, pp.126-137

Cited by 12 publications

References 61 publications

Phenomenological prediction of desalination brines nanofiltration through the indirect determination of zeta potential

Phenomenological prediction of desalination brines nanofiltration through the indirect determination of zeta potential

Nanofiltration of Multi-Ion Solutions: Quantitative Control of Concentration Polarization and Interpretation by Solution-Diffusion-Electro-Migration Model

Rejection of ammonium and nitrate from sodium chloride solutions by nanofiltration: Effect of dominant-salt concentration on the trace-ion rejection

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