Local characteristics of mass transfer under electrodialysis demineralization

Grigorchuk, O. V.; Васильева, В. И.; Шапошник, В. А.

doi:10.1016/j.desal.2005.03.048

Cited by 14 publications

(6 citation statements)

References 10 publications

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“…Electrodialysis has been used in several fields, e.g., salted waters [1], biochemical industries, wastewater treatment [2], condensation of dilute solutions, ultra-pure water production and seawater desalination, as well as the separation of electrolytes and nonelectrolytes [3]. The technology has also applied to organic acids and sugar demineralization [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Operating Parameters on the Condensation of Ammonium Sulfate by Electrodialysis

2008

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The separation of ammonium sulfate from dilute solution by electrodialysis was investigated. From the results obtained, it is suggested that it is feasible to separate ammonium sulfate from aqueous solution by electrodialysis. The removal performance of ammonium sulfate obtained was very satisfactory. The optimal cation and anion membranes were found. The removal efficiencies were influenced by voltage, initial concentration, flow rate and temperature. High voltage and high temperature are beneficial to this separation process, but high fluid flow rate and concentrated initial concentration prolong the operation time required to achieve the target value. It was found that the optimal outlet concentration is 1 g/L, since the operation time is prolonged almost two-fold if the outlet concentration is decreased from 1 g/L to 0.5 g/L.

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Section: Introductionmentioning

confidence: 99%

Effect of Operating Parameters on the Condensation of Ammonium Sulfate by Electrodialysis

2008

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“…The quality of the desalted water in the ED/EDR process can be predicted based on the dominant dimensionless numbers in the process. The dominant dimensionless numbers in the solution phase are important because ion transport in the boundary layer, strongly influenced by concentration polarization, can be considered the controlling step in the ion transport process 8 from dilute to concentrate stream due to high rate of electro-migration in the membrane phase (Grigorchuk et al, 2005;Huang, 1977;Tadimeti et al, 2015).…”

Section: Theory Of Predictive Models For Ion Removal In the Ed/edr Prmentioning

confidence: 99%

An empirical/theoretical model with dimensionless numbers to predict the performance of electrodialysis systems on the basis of operating conditions

Karimi

Ghassemi

2016

Water Research

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Among the different technologies developed for desalination, the electrodialysis/electrodialysis reversal (ED/EDR) process is one of the most promising for treating brackish water with low salinity when there is high risk of scaling. Multiple researchers have investigated ED/EDR to optimize the process, determine the effects of operating parameters, and develop theoretical/empirical models. Previously published empirical/theoretical models have evaluated the effect of the hydraulic conditions of the ED/EDR on the limiting current density using dimensionless numbers. The reason for previous studies' emphasis on limiting current density is twofold: 1) to maximize ion removal, most ED/EDR systems are operated close to limiting current conditions if there is not a scaling potential in the concentrate chamber due to a high concentration of less-soluble salts; and 2) for modeling the ED/EDR system with dimensionless numbers, it is more accurate and convenient to use limiting current density, where the boundary layer's characteristics are known at constant electrical conditions. To improve knowledge of ED/EDR systems, ED/EDR models should be also developed for the Ohmic region, where operation reduces energy consumption, facilitates targeted ion removal, and prolongs membrane life compared to limiting current conditions. In this paper, theoretical/empirical models were developed for ED/EDR performance in a wide range of operating conditions. The presented ion removal and selectivity models were developed for the removal of monovalent ions and divalent ions utilizing the dominant dimensionless numbers obtained from laboratory scale electrodialysis experiments. At any system scale, these models can predict ED/EDR performance in terms of monovalent and divalent ion removal.

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“…Sherwood number, Sh, is expressed as a function of Reynolds number, Re, and Schmidt number, Sc [7,20]. The empirical expression of Sherwood number is based on cell geometry and spacer configuration chosen for the present cell as indicated in the following [17,20,23]:…”

Section: Boundary Layer Thickness Estimationmentioning

confidence: 99%

Selection of the Best Process Stream to Remove Ca²⁺Ion Using Electrodialysis from Sugar Solution

Tadimeti

Jain

Chattopadhyay

et al. 2014

International Journal of Electrochemistry

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Electrodialytic removal of calcium chloride (CaCl2, 25–50 mol·m−3) from 5% sugar solution was executed in batch recirculation mode. Calcium ion removal rate was monitored with (i) applied potential, (ii) feed flow rate, (iii) solution viscosity and conductivity, and (iv) catholyte streams (NaOH or sodium salt of ethylene diamine tetraacetic acid-acetic acid, Na2EDTA-AA). Unsteady state model for ion concentration change was written for the ED cell used. Linearized Nernst-Planck equation instead of Ohm’s law was applied to closely obtain the current density and concentration change theoretically. The model developed could closely predict the experimental observation. Mass transfer coefficients and specific energy densities were estimated for each combination of catholyte stream used. NaOH showed better performance for a short duration over Na2EDTA-acetic acid combination.

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Local characteristics of mass transfer under electrodialysis demineralization

Cited by 14 publications

References 10 publications

Effect of Operating Parameters on the Condensation of Ammonium Sulfate by Electrodialysis

Effect of Operating Parameters on the Condensation of Ammonium Sulfate by Electrodialysis

An empirical/theoretical model with dimensionless numbers to predict the performance of electrodialysis systems on the basis of operating conditions

Selection of the Best Process Stream to Remove Ca²⁺Ion Using Electrodialysis from Sugar Solution

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Local characteristics of mass transfer under electrodialysis demineralization

Cited by 14 publications

References 10 publications

Effect of Operating Parameters on the Condensation of Ammonium Sulfate by Electrodialysis

Effect of Operating Parameters on the Condensation of Ammonium Sulfate by Electrodialysis

An empirical/theoretical model with dimensionless numbers to predict the performance of electrodialysis systems on the basis of operating conditions

Selection of the Best Process Stream to Remove Ca2+Ion Using Electrodialysis from Sugar Solution

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Selection of the Best Process Stream to Remove Ca²⁺Ion Using Electrodialysis from Sugar Solution