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Seung-hyeon Moon - One of the best experts on this subject based on the ideXlab platform.

  • Comparisons of fish meat extract desalination by Electrodialysis using different configurations of membrane stack
    Journal of Food Engineering, 2010
    Co-Authors: Phan Vu Xuan Hung, Seung-hyeon Moon
    Abstract:

    The desalination of fish meat extract was performed via Electrodialysis based on different membrane stack configurations (i.e., conventional Electrodialysis or packed-bed Electrodialysis) at a constant current. The salt removal and brix change showed that the diluted fish meat extract could be effectively desalted using Electrodialysis, while the mostly nutritional ingredients remained in the dilution. Compared with the conventional Electrodialysis (ED), a lower membrane stack potential meant lower energy consumption and higher current efficiency for the same salt removal in the packed-bed Electrodialysis (PBED). The results indicated that the PBED might be more suitable for use in the fish meat extract desalination due to the effects of ion exchange resins in enhancing ion electromigration and mitigating membrane fouling.

  • fouling of an anion exchange membrane in the Electrodialysis desalination process in the presence of organic foulants
    Desalination, 2009
    Co-Authors: Hongjoo Lee, Minkyoung Hong, Sangdon Han, Seunghee Cho, Seung-hyeon Moon
    Abstract:

    Interest in desalination using membrane processes has increased with the growth of membrane science and technology. Fouling of ion exchange membranes is one of the most significant considerations in the operation of the Electrodialysis desalination process. The influence of the adsorption capacity of foulants on the fouling potential was investigated in an Electrodialysis desalination process in the presence of negatively charged organic foulants, humate, bovine serum albumin and sodium dodecylbenzenesulfonate (SDBS). The SDBS showed higher adsorption capacity on the anion exchange membrane surface than the other two foulants in the adsorption equilibrium experiments. Of three different organic foulants, the SDBS had a more severe fouling effect on the process performance in the Electrodialysis desalination of synthetic brackish water, with irreversible fouling due to the high adsorption capacity. The study clearly showed that the adsorption capacity affects the fouling potential of the Electrodialysis desalination process.

  • determination of the limiting current density in Electrodialysis desalination as an empirical function of linear velocity
    Desalination, 2006
    Co-Authors: Heiner Strathmann, Seung-hyeon Moon
    Abstract:

    Electrodialysis is known to be a useful membrane process for water desalination. The limiting current density (LCD) in the Electrodialysis process is an important parameter which determines the electrical resistance and the current utilization. Usually, LCD depends on membrane and solution properties as well as on the Electrodialysis stack construction and various operational parameters such as the flow velocity of the diluate solution. Therefore, a reliable determination of LCD is required for designing an efficient Electrodialysis plant. In this study, LCD was measured in an Electrodialysis flow cell system of given geometry and spacer configuration as a function of the linear velocity. The coefficients a and b of an equation describing LCD as a function of the linear flow velocity of the diluate solution, ilim=aCub, were determined from a plot of the measured LCD over the electrolyte concentration versus the linear velocity on a double logarithmic scale. It was found that the coefficient b was related to the hydrodynamic conditions, while the coefficient a was affected by the cell geometry, electrolyte concentration and the membrane properties.

  • determination of the limiting current density in Electrodialysis desalination as an empirical function of linear velocity
    Desalination, 2006
    Co-Authors: Heiner Strathmann, Seung-hyeon Moon
    Abstract:

    Electrodialysis is known to be a useful membrane process for water desalination. The limiting current density (LCD) in the Electrodialysis process is an important parameter which determines the electrical resistance and the current utilization. Usually, LCD depends on membrane and solution properties as well as on the Electrodialysis stack construction and various operational parameters such as the flow velocity of the diluate solution. Therefore, a reliable determination of LCD is required for designing an efficient Electrodialysis plant. In this study, LCD was measured in an Electrodialysis flow cell system of given geometry and spacer configuration as a function of the linear velocity. The coefficients a and b of an equation describing LCD as a function of the linear flow velocity of the diluate solution, ilim=aCub, were determined from a plot of the measured LCD over the electrolyte concentration versus the linear velocity on a double logarithmic scale. It was found that the coefficient b was related to the hydrodynamic conditions, while the coefficient a was affected by the cell geometry, electrolyte concentration and the membrane properties.

  • influences of colloidal stability and electrokinetic property on Electrodialysis performance in the presence of silica sol
    Journal of Colloid and Interface Science, 2004
    Co-Authors: Hongjoo Lee, Seung-hyeon Moon
    Abstract:

    Negatively charged silica sol is known to lead to fouling of anion exchange membranes during Electrodialysis (ED) as a result of its deposition on the membrane surface. It is known that the fouling potential is related to the physical and electrochemical properties of the silica particles as well as those of the anion exchange membranes. In this study, the properties of the silica sol were characterized in terms of its particle size, turbidity, and zeta potential in order to predict their effects on the Electrodialysis performance. In the stability of colloidal particles, the critical coagulation concentrations of silica sol were determined as functions of ionic strength, cation species, and solution pH. In the Electrodialysis of NaCl solution containing silica sol with various concentrations of CaCl2, the colloidal behavior related to deposition and transport was examined during and after Electrodialysis. The Electrodialysis experiments clearly showed that the deposition and transport of silica sol during Electrodialysis were related to the colloidal stability of dispersion.

Gérald Pourcelly - One of the best experts on this subject based on the ideXlab platform.

  • effect of magnesium calcium ratio in solutions subjected to Electrodialysis characterization of cation exchange membrane fouling
    Journal of Colloid and Interface Science, 2007
    Co-Authors: Christophe Casademont, Gérald Pourcelly, Laurent Bazinet
    Abstract:

    Abstract Electrodialysis is based on the migration of charged species through perm-selective membranes under an electric field. Fouling, which is the accumulation of undesired solid materials at the interfaces of these membranes, is one of the major problems of this process. The aim of the present work was to investigate the nature and the morphology of fouling observed at different Mg/Ca ratios ( R = 0 , 1/20, 1/10, 1/5, 2/5) on cation-exchange membranes (CEM) during conventional Electrodialysis treatments. It appeared that for R = 0 , the fouling observed on the surface in contact with the basified concentrate was formed of only Ca(OH) 2 . As soon as magnesium was introduced into the solution treated, CaCO 3 was observed. Furthermore, the X-ray diffraction results also identified the CaCO 3 observed as calcite. To our knowledge, this is the first time that the presence of magnesium has been demonstrated to induce a CaCO 3 fouling on CEM during Electrodialysis.

  • effect of concentrate solution ph and mineral composition of a whey protein diluate solution on membrane fouling formation during conventional Electrodialysis
    Journal of Membrane Science, 2006
    Co-Authors: Erik Ayalabribiesca, Gérald Pourcelly, Monica Arayafarias, Laurent Bazinet
    Abstract:

    The aim of this work was to study the effect of the concentrate solution pH and the composition in calcium, carbonate and protein of the diluate solution to be treated by conventional Electrodialysis on the fouling of ion-exchange membranes. Conductivity, system resistance, pH of the diluate and cation migration were monitored to follow the evolution of the demineralization. Total cation migration was similar for all conditions although different forms of fouling were identified after three consecutive 100 min Electrodialysis treatments. The nature of fouling and the membrane surface fouled depended on the concentrate pH value, the diluate mineral composition and the intrinsic composition of the whey isolate. Once conditions leading to membrane fouling were identified, an alternative configuration for our Electrodialysis stack is proposed to prevent fouling onset.

  • comparison of different methods for deacidification of clarified passion fruit juice
    Journal of Food Engineering, 2003
    Co-Authors: Edwin Vera, Gérald Pourcelly, Jenny Ruales, Manuel Dornier, Jacqueline Sandeaux, Francoise Persin, Fabrice Vaillant, Max Reynes
    Abstract:

    Abstract The high acidity of passion fruit limits its addition in food preparation. In order to easy the uses of this juice to formulate high aroma and flavour products, its citric acid content must be decreased. Various methods such as calcium salts precipitation, ion-exchange resins and Electrodialysis with homopolar and bipolar membranes were investigated to increase the pH of a clarified passion fruit juice from 2.9 to 4.0. Each deacidification process was compared in terms of characteristics of deacidified juices such as concentration of inorganic and organic ions, colour and flavour. The deacidification by precipitation using CaCO 3 was not recommended because of CO 2 release. The ion-exchange process gave a poor quality juice in terms of organoleptic characteristics. Electrodialysis with homopolar membranes induced an increase in the sodium concentration. Precipitation with Ca(OH) 2 and Electrodialysis with bipolar membrane were the most suitable processes in terms of sensorial properties of juices treated. The physico-chemical analyses showed an increase in the calcium concentration with the use of Ca(OH) 2 that could cause some precipitation problems in the final product. Inorganic anions were eliminated together with citrate by using Electrodialysis and resins. Nevertheless, Electrodialysis with bipolar membranes presented great advantages: it was a continuous process without reagent addition moreover allowing the production of a valuable solution of citric acid.

  • deacidification of clarified passion fruit juice using different configurations of Electrodialysis
    Journal of Chemical Technology & Biotechnology, 2003
    Co-Authors: Edwin Vera, Jenny Ruales, Manuel Dornier, Jacqueline Sandeaux, Roger Sandeaux, Gérald Pourcelly
    Abstract:

    The deacidification of clarified passion fruit juice (P edulis v flavicarpa) was investigated using the Electrodialysis process (ED). Different stack configurations like conventional Electrodialysis (ED2C), three compartments Electrodialysis (ED3C) and Electrodialysis with bipolar membranes (EDBM3C, EDBM2C) were tested. The conventional Electrodialysis did not allow the deacidification of the clarified juice, whilst with the other configurations the pH of juice was increased from 2.9 (initial value) to 4.0 (target level). The ED performances were evaluated as a function of the nature of the anion exchange membrane (AEM), flow rate and current density. The physico-chemical and sensorial properties of the deacidified juices were similar : the titrable acidity was reduced from 4.3 to 1.14% w/w, the dry soluble extract varied from 13.2 to 11% w/w, the anion concentration was significantly decreased (60% of organic and 85% of inorganic anions were eliminated), the cation concentration remained inchanged, except for the sodium concentration that increased by using ED3C and EDBM3C configurations. The aroma of the passion fruit juice was preserved after treatment whatever the ED configuration used. The EDBM2C configuration deserves a special attention because the consumption of chemicals is totally eliminated and a valuable solution of citric acid with 89% of purity can be produced. Copyright © 2003 Society of Chemical Industry

Krystyna Prochaska - One of the best experts on this subject based on the ideXlab platform.

  • fumaric acid separation from fermentation broth using nanofiltration nf and bipolar Electrodialysis edbm
    Separation and Purification Technology, 2014
    Co-Authors: Marta Woźniak, Krystyna Prochaska
    Abstract:

    Abstract The suitability of two techniques: nanofiltration (NF) with ceramic membrane and bipolar Electrodialysis (EDBM), in separation and concentration of fumaric acid from fermentation broth obtained during biotechnological conversion of glycerol, was investigated. The influence of composition, concentration and pH of fumaric acid model solutions on the efficiency of nanofiltration process was studied. It was found that the retention of fumaric salts increased strongly with increasing pH of the initial solution, while the retention of glycerol was lower than 6%, irrespective of pH. In the second step, the influence of Electrodialysis stack configuration, current density, pH and concentration of fumaric acid in model solutions on the efficiency of bipolar Electrodialysis was analysed. Then, after NF pretreatment, EDBM process of simulated solutions as well as fermentation broth was performed. The current density equal to 50 A/m2 was found sufficient to achieve a 53% desalination of fumaric acid from fermentation broth. Moreover, the results obtained showed that bipolar Electrodialysis stack, consisting of anion-exchange and bipolar membranes, allowed selective separation of fumaric acid from the broth. The results suggest that NF with ceramic membrane as well as EDBM can be effectively applied as a removal step of fumaric acid from fermentation broth.

  • fumaric acid separation from fermentation broth using nanofiltration nf and bipolar Electrodialysis edbm
    Separation and Purification Technology, 2014
    Co-Authors: Marta Woźniak, Krystyna Prochaska
    Abstract:

    Abstract The suitability of two techniques: nanofiltration (NF) with ceramic membrane and bipolar Electrodialysis (EDBM), in separation and concentration of fumaric acid from fermentation broth obtained during biotechnological conversion of glycerol, was investigated. The influence of composition, concentration and pH of fumaric acid model solutions on the efficiency of nanofiltration process was studied. It was found that the retention of fumaric salts increased strongly with increasing pH of the initial solution, while the retention of glycerol was lower than 6%, irrespective of pH. In the second step, the influence of Electrodialysis stack configuration, current density, pH and concentration of fumaric acid in model solutions on the efficiency of bipolar Electrodialysis was analysed. Then, after NF pretreatment, EDBM process of simulated solutions as well as fermentation broth was performed. The current density equal to 50 A/m2 was found sufficient to achieve a 53% desalination of fumaric acid from fermentation broth. Moreover, the results obtained showed that bipolar Electrodialysis stack, consisting of anion-exchange and bipolar membranes, allowed selective separation of fumaric acid from the broth. The results suggest that NF with ceramic membrane as well as EDBM can be effectively applied as a removal step of fumaric acid from fermentation broth.

Heiner Strathmann - One of the best experts on this subject based on the ideXlab platform.

  • Electrodialysis a mature technology with a multitude of new applications
    Desalination, 2010
    Co-Authors: Heiner Strathmann
    Abstract:

    Abstract Electrodialysis is a mature process which is applied since more than 50 years on a large industrial scale for the production of potable water from brackish water sources. But more recently Electrodialysis in combination with bipolar membranes or with ion-exchange resins has found a large number of new interesting applications in the chemical process industry, in the food and drug industry as well as in waste water treatment and the production of high quality industrial water. In this paper the principle of Electrodialysis is described and its advantages and limitations in various applications are pointed out. More recent developments in Electrodialysis as well as in related processes such as electrodialytic water dissociation or continuous electrodeionization are discussed and their present and potential future applications are indicated. Research needs for a sustainable growth of Electrodialysis and related processes are pointed out.

  • determination of the limiting current density in Electrodialysis desalination as an empirical function of linear velocity
    Desalination, 2006
    Co-Authors: Heiner Strathmann, Seung-hyeon Moon
    Abstract:

    Electrodialysis is known to be a useful membrane process for water desalination. The limiting current density (LCD) in the Electrodialysis process is an important parameter which determines the electrical resistance and the current utilization. Usually, LCD depends on membrane and solution properties as well as on the Electrodialysis stack construction and various operational parameters such as the flow velocity of the diluate solution. Therefore, a reliable determination of LCD is required for designing an efficient Electrodialysis plant. In this study, LCD was measured in an Electrodialysis flow cell system of given geometry and spacer configuration as a function of the linear velocity. The coefficients a and b of an equation describing LCD as a function of the linear flow velocity of the diluate solution, ilim=aCub, were determined from a plot of the measured LCD over the electrolyte concentration versus the linear velocity on a double logarithmic scale. It was found that the coefficient b was related to the hydrodynamic conditions, while the coefficient a was affected by the cell geometry, electrolyte concentration and the membrane properties.

  • determination of the limiting current density in Electrodialysis desalination as an empirical function of linear velocity
    Desalination, 2006
    Co-Authors: Heiner Strathmann, Seung-hyeon Moon
    Abstract:

    Electrodialysis is known to be a useful membrane process for water desalination. The limiting current density (LCD) in the Electrodialysis process is an important parameter which determines the electrical resistance and the current utilization. Usually, LCD depends on membrane and solution properties as well as on the Electrodialysis stack construction and various operational parameters such as the flow velocity of the diluate solution. Therefore, a reliable determination of LCD is required for designing an efficient Electrodialysis plant. In this study, LCD was measured in an Electrodialysis flow cell system of given geometry and spacer configuration as a function of the linear velocity. The coefficients a and b of an equation describing LCD as a function of the linear flow velocity of the diluate solution, ilim=aCub, were determined from a plot of the measured LCD over the electrolyte concentration versus the linear velocity on a double logarithmic scale. It was found that the coefficient b was related to the hydrodynamic conditions, while the coefficient a was affected by the cell geometry, electrolyte concentration and the membrane properties.

Nicolò Patroniti - One of the best experts on this subject based on the ideXlab platform.

  • respiratory Electrodialysis a novel highly efficient extracorporeal co2 removal technique
    American Journal of Respiratory and Critical Care Medicine, 2015
    Co-Authors: Alberto Zanella, Domenico Salerno, Salua Abd El Aziz El Sayed Deab, Federico Magni, Vittorio Scaravilli, Marco Giani, Luigi Castagna, Mariangela Albertini, Salvatore Mazzola, Nicolò Patroniti
    Abstract:

    Rationale: We developed an innovative, minimally invasive, highly efficient extracorporeal CO2 removal (ECCO2R) technique called respiratory Electrodialysis (R-ED).Objectives: To evaluate the efficacy of R-ED in controlling ventilation compared with conventional ECCO2R technology.Methods: Five mechanically ventilated swine were connected to a custom-made circuit optimized for R-ED, consisting of a hemofilter, a membrane lung, and an Electrodialysis cell. Electrodialysis regionally modulates blood electrolyte concentration to convert bicarbonate to CO2 before entering the membrane lung, enhancing membrane lung CO2 extraction. All animals underwent three repeated experimental sequences, consisting of four steps: baseline (1 h), conventional ECCO2R (2 h), R-ED (2 h), and final NO-ECCO2R (1 h). Blood and gas flow were 250 ml/min and 10 L/min, respectively. Tidal volume was set at 8 ml/kg, and respiratory rate was adjusted to maintain arterial Pco2 at 50 mm Hg.Measurements and Main Results: During R-ED, chlori...

  • Respiratory Electrodialysis : a novel, highly efficient, extracorporeal CO2 removal technique
    'American Thoracic Society', 2015
    Co-Authors: Alberto Zanella, Domenico Salerno, Federico Magni, Vittorio Scaravilli, Marco Giani, Luigi Castagna, Mariangela Albertini, Salvatore Mazzola, Abd El Aziz El Sayed S. Deab, Nicolò Patroniti
    Abstract:

    We developed an innovative, minimally invasive, highly efficient, extracorporeal CO2 removal (ECCO2R) technique called Respiratory Electrodialysis (R-ED). OBJECTIVES: To evaluate the efficacy of R-ED in controlling ventilation compared to conventional ECCO2R-technology. METHODS: Five mechanically ventilated swine were connected to a custom-made circuit optimized for R-ED, consisting of a hemofilter, a membrane lung, and an Electrodialysis cell. Electrodialysis regionally modulates blood electrolyte concentration to convert bicarbonate to CO2 prior to entering the membrane lung, enhancing membrane lung CO2 extraction. All animals underwent 3 repeated experimental sequences, consisting of 4 steps: Baseline (1 h), conventional ECCO2R (2 h), R-ED (2 h), and Final NO-ECCO2R (1 h). Blood and gas flow were 250 mL/min and 10 L/min, respectively. Tidal volume was set at 8 mL/kg and respiratory rate was adjusted to maintain arterial pCO2 at 50 mmHg. MEASUREMENTS AND MAIN RESULTS: During R-ED, chloride and H+ concentration increased in blood entering the membrane lung, almost doubling CO2 extraction compared to ECCO2R (112 \ub1 6 vs. 64 \ub1 5 mL/min, p < 0.001). Compared to baseline, R-ED and ECCO2R reduced minute ventilation by 50% and 27%, respectively. Systemic arterial gas analyses remained stable during the experimental phases. No major complication occurred, but an increase in creatinine level. CONCLUSIONS: In this first in-vivo application, we proved Electrodialysis feasible and effective in increasing membrane lung CO2 extraction. R-ED was more effective than conventional ECCO2R-technology in controlling ventilation. Further studies are warranted to assess safety profile of R-ED, especially as regards to kidney function