Electrodialysis with asymmetrically profiled membranes: Influence of profiles geometry on desalination performance and limiting current phenomena

Gurreri, Luigi; Filingeri, Antonia; Ciofalo, Michele; Cipollina, Andrea; Tedesco, Michele; Tamburini, Alessandro; Micale, Giorgio Domenico Maria

doi:10.1016/j.desal.2021.115001

Cited by 28 publications

(8 citation statements)

References 76 publications

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“…The LCD was comprised between ⁓5.5 and ⁓27.3 A m -2 , confirming the roughly proportional influence of both the flow rate (or velocity) and Cdil,IN. A modest increase in LCD with Cconc,IN was found, as already observed in previous experiments with shorter stacks [74,79].…”

Section: Comparison Of All Testssupporting

confidence: 89%

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Current distribution along electrodialysis stacks and its influence on the current-voltage curve: behaviour from near-zero current to limiting plateau

et al. 2023

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Section: Comparison Of All Testssupporting

confidence: 89%

“…A/m 2 at 2 cm/s) providing the highest η were practically coincident with the LCDs. As the applied voltage increased in the plateau region, η slowly decreased, as already observed in previous experiments [74,79]. Interestingly, a very non-uniform current distribution was observed at any applied voltage.…”

Section: Feed Concentrations 05-30 G/lsupporting

confidence: 82%

Current distribution along electrodialysis stacks and its influence on the current-voltage curve: behaviour from near-zero current to limiting plateau

et al. 2023

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“…Los cationes migran a través de la membrana de intercambio catiónico, pero son retenidos en la membrana de intercambio aniónico; los aniones migran a través de la membrana de intercambio aniónico, pero son retenidos a su vez en la membrana de intercambio catiónico. Por lo tanto, hay canales en los que se produce acumulación de iones, mientras en otros disminuye su concentración, pudiéndose extraer agua con muy baja concentración de sales por una parte, y una corriente muy concentrada por otra [47,48,49,50]. Un esquema del procedimiento se muestra en la Figura 5.…”

Section: Electrodiálisis (Ed)unclassified

Estado del arte. Métodos de desalinización de agua

2021

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El agua de mar desalinizada ha llegado a ser una fuente importante de abastecimiento para grupos poblacionales en todo el mundo debido a la creciente escasez de agua para consumo humano. Muchos factores han aportado en ello, la abundante disponibilidad de agua de mar y salobre, la diversidad de métodos desarrollados, sus continuas mejoras y la paulatina reducción de costos. Los principales métodos usados son la ósmosis inversa, la evaporación instantánea multi etapa y la destilación multi efecto, los cuales han mejorado su eficiencia debido tanto a la experiencia con las plantas desalinizadoras como a las investigaciones y desarrollos teóricos recientes. En este documento se presenta una revisión de los métodos de desalinización, tanto de aquellos que se vienen empleando desde hace tiempo, como de nuevos métodos reportados, así como algunas consideraciones respecto a la energía empleada y los costos del agua desalinizada obtenida.

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“…In this regard, the search for ways to separate singly and doubly charged ions is attracting more and more attention [ 24 , 25 , 26 ]. A number of approaches have been proposed to improve the selectivity of industrial membranes [ 27 ], e.g., membrane profiling [ 28 ], deposition of a layer of oppositely charged polyelectrolyte or several layers of alternately charged polyelectrolytes [ 25 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Selectivity of RALEX-CM Membranes via Modification by Ceria with a Functionalized Surface

et al. 2023

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Ion exchange membranes are widely used for water treatment and ion separation by electrodialysis. One of the ways to increase the efficiency of industrial membranes is their modification with various dopants. To improve the membrane permselectivity, a simple strategy of the membrane surface modification was proposed. Heterogeneous RALEX-CM membranes were surface-modified by ceria with a phosphate-functionalized surface. Despite a decrease in ionic conductivity of the prepared composite membranes, their cation transport numbers slightly increase. Moreover, the modified membranes show a threefold increase in Ca2+/Na+ permselectivity (from 2.1 to 6.1) at low current densities.

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Electrodialysis with asymmetrically profiled membranes: Influence of profiles geometry on desalination performance and limiting current phenomena

Cited by 28 publications

References 76 publications

Current distribution along electrodialysis stacks and its influence on the current-voltage curve: behaviour from near-zero current to limiting plateau

Current distribution along electrodialysis stacks and its influence on the current-voltage curve: behaviour from near-zero current to limiting plateau

Estado del arte. Métodos de desalinización de agua

Improvement of Selectivity of RALEX-CM Membranes via Modification by Ceria with a Functionalized Surface

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