Determination of limiting current density and current efficiency in electrodialysis units

Cerva, Mariagiorgia La; Gurreri, Luigi; Tedesco, Michele; Cipollina, Andrea; Ciofalo, Michele; Tamburini, Alessandro; Micale, G.

doi:10.1016/j.desal.2018.07.028

Cited by 116 publications

(75 citation statements)

References 58 publications

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“…In physical models, the LCD is empirically correlated to the flow velocity and bulk concentration of the diluate [16]. Some studies have reported LCD equations that depend on the hydrodynamic conditions, including flow velocity, and that include coefficients that are constant or functions of the flow velocity [15,17].…”

Section: Dependence Of the Lcd On Metal Concentrationmentioning

confidence: 99%

“…In general, concentration polarization refers to the dissociation of water into H + and OHwhen the ion concentration on the surface of the cation and/or anion exchange membrane in the diluate cell is 0. Here, because the anions (cations) are transported through the anion (cation) exchange membrane to the concentrate cell, the cations (anions) are concentrated in the boundary layer of the membrane surface to the diluate cell and increase at the surface facing the concentrate cell [8][9][10][15][16][17]. Therefore, scaling may occur due to the deposition of metal hydroxides on the surface of the ion exchange membrane [8,[18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the LCD is one of the most important design parameters to determine the efficiency of plant operation. Therefore, to treat wastewater efficiently using electrodialysis, it is important to study the dependence of the LCD on the operating parameters [2][3]16]. Most studies have focused on the use of electrodialysis as a seawater desalination process.…”

Section: Introductionmentioning

confidence: 99%

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Flow velocity and cell pair number effect on current efficiency in plating wastewater treatment through electrodialysis

Min

Kim

et al. 2020

Environmental Engineering Research

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Electrodialysis has been used for treating toxic substances such as heavy metals and minimizing secondary environmental pollution problems effectively. However, electrodialysis depends on the operating parameters as well as fluid dynamics and electrical properties. This study provides design elements for the treatment of heavy metal-containing wastewater by electrodialysis. We found that the limiting current density (LCD) is proportional but not completely linear to the diluate concentration over a threshold value. In contrast, it is linear to the linear flow velocity for the whole range. As the number of cell pairs increases, because linear flow velocity and LCD increase, the removal efficiency of heavy metals also increases. Therefore, for highly concentrated wastewater, increasing the linear flow velocity, the applied voltage, and the number of cell pairs can effectively improve removal efficiency. It was found that the current efficiency is as low as 17% when the removal efficiency of heavy metals exceeds 95%. Thus, it is necessary to select an operating range that optimizes the operating and initial investment costs for the effective removal of heavy metals using electrodialysis.

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Section: Dependence Of the Lcd On Metal Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flow velocity and cell pair number effect on current efficiency in plating wastewater treatment through electrodialysis

Min

Kim

et al. 2020

Environmental Engineering Research

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“…However, in this case they have limited prediction capabilities, providing accurate results only under some conditions [47]. On the contrary, distributed parameters models [49][50][51][52][53][54][55][56] are more accurate, but at the cost of a larger implementation effort. In summary, with respect to the theoretical models, 1-D semi-empirical models are preferable as process simulators thanks to their features of versatility, robustness and effectiveness.…”

Section: Overview Of Modelling Approaches For Electrodialysismentioning

confidence: 99%

“…In particular, the majority makes use of either empirical information [42][43][44]48,52,55,57] (e.g. limiting current density) or 3-D computational fluid dynamics (CFD) simulations [50,51,54,56].…”

Section: Overview Of Modelling Approaches For Electrodialysismentioning

confidence: 99%

A hierarchical model for novel schemes of electrodialysis desalination

et al. 2019

Self Cite

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A new hierarchical model for the electrodialysis (ED) process is presented. The model has been implemented into gPROMs Modelbuilder (PSE), allowing the development of a distributedparameters simulation tool that combines the effectiveness of a semi-empirical modelling approach to the flexibility of a layered arrangement of modelling scales. Thanks to its structure, the tool makes possible the simulation of many different and complex layouts, requiring only membrane properties as input parameters (e.g. membrane resistance or salt and water permeability). The model has been validated against original experimental data obtained from a lab scale ED test rig. Simulation results concerning a 4-stage treatment of seawater and dynamic batch operations of brackish water desalination are presented, showing how the model can be effectively used for predictive purposes and for providing useful insights on design and optimisation. Self-Archived version: Campione A, Cipollina A, Bogle IDL, Gurreri L, Tamburini A, Tedesco M, et al. A hierarchical model for novel schemes of electrodialysis desalination. Desalination 2019;465:79-93.

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New ion exchange membrane derived from sulfochlorated polyether sulfone for electrodialysis desalination of brackish water

Mabrouk

Lafi

Fauvarque

et al. 2020

Polymers for Advanced Techs

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The purpose of this work is to study the desalination of brackish water using a new ion exchange membrane, made from sulfochlorated polyethersulfone (Cl-PES), and crosslinked using aminated polyethersulfone (NH2-PES) as a crosslinking reagent. This membrane, named ClNH2 membrane, has been obtained by reaction between Cl-PES with 1.3 SO 2 Cl groups per monomer unit and 0.2 equivalent amount of NH2-PES. ClNH2 membrane has been characterized in terms of contact angle, transport number, intrinsic conductivity, and water uptake (as a function of temperature). Electrodialysis performances of the newly synthetized membranes have been measured using an electrodialysis cell at a laboratory scale and compared to commercial membranes. All the experiments have been performed using synthetic brackish water solutions prepared from sodium chloride salts with different concentrations (varying from 0.5 to 5.0 g/L). The concentration of different water samples obtained has been found to be below the amount recommended by the World Health Organization (WHO) for drinking water.

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Determination of limiting current density and current efficiency in electrodialysis units

Cited by 116 publications

References 58 publications

Flow velocity and cell pair number effect on current efficiency in plating wastewater treatment through electrodialysis

Flow velocity and cell pair number effect on current efficiency in plating wastewater treatment through electrodialysis

A hierarchical model for novel schemes of electrodialysis desalination

New ion exchange membrane derived from sulfochlorated polyether sulfone for electrodialysis desalination of brackish water

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