Digital simulation of an electrodeionization process

Verbeek, H. M. W.; Fürst, L.; Neumeister, H.

doi:10.1016/s0098-1354(98)00179-3

Cited by 22 publications

(6 citation statements)

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“…Although the microscopic mechanisms of EDI have received much less attention compared to those of ED, there have been several efforts to mathematically model ,,− and numerically simulate − the process of EDI. Early descriptions of EDI proposed that the removal of ions occurs in two steps .…”

Section: Electrokinetic Separationsmentioning

confidence: 99%

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. Water pollution is exacerbated by the decreasing ability of traditional treatment methods to comply with tightening environmental standards. This review provides a comprehensive description of the principles and applications of electrochemical methods for water purification, ion separations, and energy conversion. Electrochemical methods have attractive features such as compact size, chemical selectivity, broad applicability, and reduced generation of secondary waste. Perhaps the greatest advantage of electrochemical methods, however, is that they remove contaminants directly from the water, while other technologies extract the water from the contaminants, which enables efficient removal of trace pollutants. The review begins with an overview of conventional electrochemical methods, which drive chemical or physical transformations via Faradaic reactions at electrodes, and proceeds to a detailed examination of the two primary mechanisms by which contaminants are separated in nondestructive electrochemical processes, namely electrokinetics and electrosorption. In these sections, special attention is given to emerging methods, such as shock electrodialysis and Faradaic electrosorption. Given the importance of generating clean, renewable energy, which may sometimes be combined with water purification, the review also discusses inverse methods of electrochemical energy conversion based on reverse electrosorption, electrowetting, and electrokinetic phenomena. The review concludes with a discussion of technology comparisons, remaining challenges, and potential innovations for the field such as process intensification and technoeconomic optimization.

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Section: Electrokinetic Separationsmentioning

confidence: 99%

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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“…The ion exchange resin beads used in a conventional EDI are packed as a loose resin bed enclosed between two membranes (33–35). We designed a new resin EDI system with the resins immobilized and molded into a wafer to form a “resin wafer” (Fig.…”

Section: Resultsmentioning

confidence: 99%

The Separative Bioreactor: A Continuous Separation Process for the Simultaneous Production and Direct Capture of Organic Acids

Snyder

et al. 2007

Separation Science and Technology

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The replacement of petrochemicals with biobased chemicals requires efficient bioprocesses, biocatalysis, and product recovery. Biocatalysis (e.g., enzyme conversion and fermentation) offers an attractive alternative to chemical processing because biocatalysis utilize renewable feedstocks under benign reaction conditions. One class of chemical products that could be produced in large volumes by biocatalysis is organic acids. However, biocatalytic reactions to produce organic acids typically result in only dilute concentrations of the product because of product inhibition and acidification that drives the reaction pH outside of the optimal range for the biocatalyst. Buffering or neutralization results in formation of the acid salt rather than the acid, which requires further processing to recover the free acid product.To address these barriers to biocatalytic organic acid production, we developed the “separative bioreactor” based on resin wafer electrodeionization, which is an electro-deionization platform that uses resin wafers fabricated from ion exchange resins. The separative bioreactor simultaneously separates the organic acid from the biocatalyst as it is produced, thus it avoids product inhibition enhancing reaction rates. In addition, the separative bioreactor recovers the product in its acid form to avoid neutralization. The instantaneous separation of acid upon formation in the separative bioreactor is one of the first truly one-step systems for producing organic acids.The separative bioreactor was demonstrated with two systems. In the first demonstration, the enzyme glucose fructose oxidoreductase (GFOR) was immobilized in the reactor and later regenerated in situ. GFOR produced gluconic acid (in its acid form) continuously for 7 days with production rates up to 1000 mg/L/hr at >99% product recovery and GFOR reactivity >30mg gluconic acid/mg GFOR/hour. In the second demonstration, the E. coli strain CSM1 produced lactic acid for up to 24 hours with a productivity of >200 mg/L/hr and almost 100% product recovery.

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“…Different works were devoted, on the one hand, to modelling of weak acid production by EDBM method (5,6) and, on the other hand, to modelling of ultrapure water production by the EDI method (7,8) but, to our knowledge, no report has been published on modelling of weak acid production by the EDI method. The present paper deals with the modelling of an EDI compartment allowing the conversion of salt of weak acid into the corresponding acid.…”

Section: Modelling Of Weak Acid Conversion In An Edl Cellmentioning

confidence: 99%

Modelling of Weak Acid Conversion in an EDl Cell

Schab¹,

Muhr²,

Bounaceur³

et al. 2010

Separation Science and Technology

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The modelling of weak acid conversion in an EDl cell is described. The model takes into account the solution and resin ion transport numbers, acid dissociation, and ion exchange equilibrium. Simulations, which provide results that agree well with experiments, enable us to evaluate concentrations and conductivities in each position of the ion exchange packed bed, leading to 2D representations. A reduced flow rate F red , defined as the ratio of the experimental flow rate over the maximum flow rate which would enable 100% conversion, in the case of 100% current efficiency, has been introduced. Steady-state conversion rate appears to have a strong nonlinear dependency on this dimensionless parameter.

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Digital simulation of an electrodeionization process

Cited by 22 publications

References 1 publication

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

The Separative Bioreactor: A Continuous Separation Process for the Simultaneous Production and Direct Capture of Organic Acids

Modelling of Weak Acid Conversion in an EDl Cell

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