Search results for "reverse electrodialysis."

showing 10 items of 74 documents

A simulation tool for analysis and design of reverse electrodialysis using concentrated brines

2015

Abstract Reverse electrodialysis (SGP-RE or RED) represents a viable technology for the conversion of the salinity gradient power into electric power. A comprehensive model is proposed for the RED process using sea or brackish water and concentrated brine as feed solutions. The goals were (i) reliably describing the physical phenomena involved in the process and (ii) providing information for optimal equipment design. For such purposes, the model has been developed at two different scales of description: a lower scale for the repeating unit of the system (cell pair), and a higher scale for the entire equipment (stack). The model was implemented in a process simulator, validated against orig…

EngineeringSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciGeneral Chemical EngineeringSettore ING-IND/25 - Impianti Chimicisea waterprocess simulator7. Clean energyReversed electrodialysisOsmotic powerProcess engineeringSalinity Gradient PowerPower densitygeographygeography.geographical_feature_categoryBrackish waterbusiness.industryEnvironmental engineeringReverse ElectrodialysiGeneral ChemistryInlet6. Clean waterVolumetric flow ratebrineBrineElectric powerbusinessSalinity Gradient Power; Reverse Electrodialysis; sea water; brine; process simulator; multi-scale modelmulti-scale modelChemical Engineering Research and Design
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Coupling CFD with a one-dimensional model to predict the performance of reverse electrodialysis stacks

2017

Abstract Different computer-based simulation models, able to predict the performance of Reverse ElectroDialysis (RED) systems, are currently used to investigate the potentials of alternative designs, to orient experimental activities and to design/optimize prototypes. The simulation approach described here combines a one-dimensional modelling of a RED stack with a fully three-dimensional finite volume modelling of the electrolyte channels, either planar or equipped with different spacers or profiled membranes. An advanced three-dimensional code was used to provide correlations for the friction coefficient (based on 3-D solutions of the continuity and Navier-Stokes equations) and the Sherwoo…

EngineeringSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/25 - Impianti ChimiciReverse electrodialysis; Saline Gradient Energy; Ion Exchange Membrane; Computational Fluid Dynamics; Mass transferFiltration and Separation02 engineering and technologyComputational Fluid DynamicComputational fluid dynamicsBiochemistry020401 chemical engineeringStack (abstract data type)Reversed electrodialysisReverse electrodialysiPerformance predictionMass transferGeneral Materials Science0204 chemical engineeringPhysical and Theoretical ChemistrySettore ING-IND/19 - Impianti NucleariSimulationIon Exchange MembraneLaplace's equationSettore ING-IND/24 - Principi Di Ingegneria ChimicaSaline Gradient EnergyFinite volume methodbusiness.industryScalar (physics)Mechanics021001 nanoscience & nanotechnologySettore ING-IND/06 - Fluidodinamica0210 nano-technologyConvection–diffusion equationbusinessJournal of Membrane Science
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Exergy analysis of reverse electrodialysis

2018

Abstract Reverse electrodialysis in closed loop configurations is a promising membrane technology in the energy conversion and storage fields. One of the main advantages of closed-loop reverse electrodialysis is the possibility of using a wide range of operating concentrations, flow rates and different salts for generating the salinity gradient. In this work, an original exergy analysis of the reverse electrodialysis process was carried out in order to investigate reverse electrodialysis performance in terms of energetic and exergetic efficiency parameters in a wide range of operating conditions. A mono-dimensional model of the reverse electrodialysis process was developed, in which all sou…

ExergyWork (thermodynamics)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciMaterials scienceExergy Analysi020209 energyEnergy Engineering and Power Technology02 engineering and technologyChemical ExergyEfficiencySalinity Gradient Power; Reverse Electrodialysis; Exergy Analysis; Chemical Exergy; Efficiency7. Clean energyMembrane technology020401 chemical engineeringReversed electrodialysis0202 electrical engineering electronic engineering information engineeringSettore ING-IND/10 - Fisica Tecnica IndustrialeEnergy transformation0204 chemical engineeringProcess engineeringSalinity Gradient PowerRenewable Energy Sustainability and the Environmentbusiness.industryReverse Electrodialysi6. Clean waterVolumetric flow rateFuel TechnologyMembraneNuclear Energy and EngineeringExergy efficiencybusiness
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Special applications of reverse electrodialysis

2016

Reverse electrodialysis (RED) is a process for direct electricity production from salinity gradients, based on the use of suitable exchange membranes. To develop the RED process on an applicative scale and to add value to the overall process, a key role is entrusted to the selection of electrodic system, redox species, and electrode materials. In particular, it was shown that a proper selection of redox processes allows the use of a RED cell for the wastewater treatment of organic and inorganic pollutants resistant to conventional biological methods and for the synthesis of chemicals without energy supply. The utilization of microbial reverse electrodialysis cells was also proposed to incre…

Microbial reverse electrodialysis cellElectrode materialWaste managementProduction of chemicalbusiness.industryChemistryReverse electrodialysis (RED)Redox processeTreatment of AO7 and Cr(VI)Settore ING-IND/27 - Chimica Industriale E TecnologicaRedoxEngineering (all)MembraneElectricity generationWastewaterScientific methodReversed electrodialysisSequestration of CO2Sewage treatmentProcess engineeringbusiness
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Cathodic abatement of Cr(VI) in water by microbial reverse-electrodialysis cells

2015

Abstract For the first time a microbial reverse electrodialysis cell (MRC) was used for the treatment of water contaminated by Cr(VI). It has been recently shown that both inorganic and organic pollutants can be removed by reverse electrodialysis processes (RED) using water with different salinity without the supply of electric energy. However, a high number of membrane pairs is usually necessary for the treatment of wastewater by RED. Here, it was showed that a lower number of membranes can be used by the utilization of a MRC (i.e., a RED cell with a biotic anode) for such purposes. Indeed, the abatement of Cr(VI), chosen as model pollutant, was successfully achieved by cathodic reduction …

PollutantChromatographyChemistryGeneral Chemical EngineeringInorganic chemistryContaminationAnalytical ChemistryAnodeCathodic protectionSalinityMembraneWastewaterReverse electrodialysis Microbial reverse electrodialysis Cr(VI) Salinity gradient Waste waterReversed electrodialysisElectrochemistry
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CFD prediction of concentration polarization phenomena in spacer-filled channels for Reverse Electrodialysis

2014

Abstract Salinity Gradient Power generation through Reverse Electrodialysis (SGP-RE) is a promising technology to convert the chemical potential difference of a salinity gradient into electric energy. In SGP-RE systems, as in most membrane processes, concentration polarization phenomena may affect the theoretical driving force and thus the performance of the process. Operating conditions, including the feed solution flow rate and concentration and the channels׳ geometrical configuration, may greatly influence both the polarization effect and the pumping energy consumption. The present work uses CFD to investigate the dependence of concentration polarization and pressure drop on flow rate, f…

Pressure dropSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciChemistryAnalytical chemistryFiltration and Separation02 engineering and technologyElectrodialysis021001 nanoscience & nanotechnology7. Clean energyBiochemistry6. Clean waterVolumetric flow rate020401 chemical engineeringChemical physicsReversed electrodialysisOsmotic powerGeneral Materials Science0204 chemical engineeringPhysical and Theoretical Chemistry0210 nano-technologyPolarization (electrochemistry)Current densitySettore ING-IND/19 - Impianti NucleariConcentration polarizationCFD Reverse Electrodialysis concentration polarization spacer-filled channel mixing promoter
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REVERSE ELECTRODIALYSIS PROCESSES FOR THE PRODUCTION OF CHEMICALS AND THE TREATMENT OF CONTAMINATED WASTEWATER

REVERSE ELECTRODIALYSIS PROCESSES TREATMENT OF CONTAMINATED WASTEWATER MICROBIAL FUEL CELL MICROBIAL REVERSE ELECTRODIALYSIS CELL
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ABATEMENT OF POLLUTANTS IN AQUEOUS SOLUTIONS BY REVERSE ELECTRODIALYSIS PROCESSES

2013

Electrochemistry-based technologies are very promising methods for treating wastewaters containing organic and inorganic pollutants that are either resistant to biological processes or toxic for microorganisms [1]. On the other hand, in the reverse electrodialysis (RED), the electrical energy is directly extracted from chemical potential gradients arising from salinity differences [2], especially between brine solution and sea water. RED can be potentially used for the simultaneous generation of electrical energy and the treatment of waters contaminated by recalcitrant pollutants. The advantages of using the RED process for such dual purpose are: the utilization of a green reagent such as t…

REVERSE ELECTRODIALYSIS ABATEMENT OF POLLUTANTS
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Investigation of electrode material – redox couple systems for reverse electrodialysis processes. Part II: Experiments in a stack with 10–50 cell pai…

2013

Abstract The performances of reverse electrodialysis depend on several factors, including the nature of the electrode material and of the redox processes adopted to make possible the conversion between chemical potential and electric power. In this paper the possible utilization of various redox processes (reduction/oxidation of iron species, oxidation and reduction of water, oxidation of chlorine and reduction of water) was studied in a stack equipped with 10–50 cell pairs and by focused electrolyses in a three compartment cell. The effect of selected redox processes on power density output and eventual contamination of saline solutions flowing in the stack was evaluated in detail. The eff…

Redox processes StackGeneral Chemical EngineeringInorganic chemistrychemistry.chemical_element02 engineering and technology010501 environmental sciencesElectrodialysi01 natural sciencesRedoxAnalytical ChemistryStack (abstract data type)Reversed electrodialysisElectrochemistryChlorine0105 earth and related environmental sciencesPower densityElectrode reactionElectrodialysis reversalElectrolysis of waterElectrodialysis; Reverse Electrodialysis; Electrode reaction; Redox processes StackReverse ElectrodialysiElectrodialysis021001 nanoscience & nanotechnology6. Clean waterchemistry13. Climate action0210 nano-technologyJournal of Electroanalytical Chemistry
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An application of Reverse ElectroDialysis: energy production from produced water

2022

Reverse Electrodialysis Produced Water Energy production Long-Run test
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