Search results for " Electrodialysis"

showing 10 items of 114 documents

Evaluating the Utilization of Innovative Electrochemical Methodologies for the Real Wastewater Treatment

2021

microfluidicwastewater treatmentreverse electrodialysisenergy consumptionelectrochemical
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Novel solutions for closed-loop Reverse Electrodialysis: thermodynamic characterisation and perspective analysis

2019

Abstract Closed-loop Reverse Electrodialysis is a novel technology to directly convert low-grade heat into electricity. It consists of a reverse electrodialysis (RED) unit where electricity is produced exploiting the salinity gradient between two salt-water solutions, coupled with a regeneration unit where waste-heat is used to treat the solutions exiting from the RED unit and restore their initial composition. One of the most important advantages of closed-loop systems compared to the open systems is the possibility to select ad-hoc salt solutions to achieve high efficiencies. Therefore, the properties of the salt solutions are essential to assess the performance of the energy generation a…

Activity coefficientMaterials science020209 energyThermodynamicschemistry.chemical_elementSalt (chemistry)02 engineering and technologyIndustrial and Manufacturing Engineering020401 chemical engineeringReversed electrodialysis0202 electrical engineering electronic engineering information engineeringOsmotic coefficient0204 chemical engineeringElectrical and Electronic EngineeringCivil and Structural Engineeringchemistry.chemical_classificationMolalityAqueous solutionMechanical EngineeringBuilding and ConstructionPollution6. Clean waterGeneral EnergyElectricity generationchemistryCaesiumClosed loop reverse electrodialysis Multi-stage evaporative regeneration unit Potassium acetate Caesium acetate Osmotic coefficient Pitzer's model.
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On the modelling of an Acid/Base Flow Battery: An innovative electrical energy storage device based on pH and salinity gradients

2020

Abstract Electrical energy storage can enhance the efficiency in the use of fluctuating renewable sources, e.g. solar and wind energy. The Acid/Base Flow Battery is an innovative and sustainable process to store electrical energy in the form of pH and salinity gradients via electrodialytic reversible techniques. Two electromembrane processes are involved: Bipolar Membrane Electrodialysis during the charge phase and its opposite, Bipolar Membrane Reverse Electrodialysis, during the discharge phase. For the first time, the present work aims at predicting the performance of this energy storage device via the development of a dynamic mathematical model based on a multi-scale approach with distr…

Battery (electricity)Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciWork (thermodynamics)Wind powerbusiness.industry020209 energyMechanical EngineeringElectric potential energy02 engineering and technologyBuilding and ConstructionManagement Monitoring Policy and LawElectrodialysis7. Clean energy6. Clean waterEnergy storageRenewable energyGeneral Energy020401 chemical engineeringReversed electrodialysisElectrochemical energy storage Electrodialytic battery Ion-exchange membrane Ionic shortcut currents Process modelling Water splitting0202 electrical engineering electronic engineering information engineeringEnvironmental science0204 chemical engineeringProcess engineeringbusinessApplied Energy
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Surface water RO permeate remineralization through minerals recovery from brines

2022

Assisted-Reverse Electrodialysis (A-RED) technology was applied following reverse osmosis (RO) of a surface water resource in order to recover minerals from its brine and directly remineralize the RO unit's permeate. Four different sets of cation/anion exchange membranes were benchmarked using single- and mixed-salts synthetic solutions as well as real brine and permeate streams produced from three-stage reverse osmosis applied to Seine River water. The process, operating under equal permeate and brine channel flows (2 cm/s velocities) and applied voltage varying from 0 to 10 V, showed viable remineralization results. Optimal recovery at 10 V applied allowed increasing permeate mineral cont…

Brine recovery A-RED Reverse electrodialysis Reverse osmosisMechanical EngineeringGeneral Chemical EngineeringGeneral Materials ScienceGeneral ChemistryWater Science and TechnologyDesalination
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Modelling the Reverse ElectroDialysis process with seawater and concentrated brines

2012

Technologies for the exploitation of renewable energies have been dramatically increasing in number, complexity and type of source adopted. Among the others, the use of saline gradient power is one of the latest emerging possibilities, related to the use of the osmotic/chemical potential energy of concentrated saline solutions. Nowadays, the fate of this renewable energy source is intrinsically linked to the development of the pressure retarded osmosis and reverse electrodialysis technologies. In the latter, the different concentrations of two saline solutions is used as a driving force for the direct production of electricity within a stack very similar to the conventional electrodialysis …

Chemical potentialSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/25 - Impianti Chimici020209 energyOcean Engineering02 engineering and technology7. Clean energyModellingSaline gradient powerSaline gradient power; Reverse electrodialysis; Modelling; Multi-scale; gPROMSStack (abstract data type)Reversed electrodialysisReverse electrodialysi0202 electrical engineering electronic engineering information engineeringOsmotic powergPROMSMulti-scaleWater Science and Technologybusiness.industryChemistryPressure-retarded osmosisEnvironmental engineeringElectrodialysis021001 nanoscience & nanotechnologyPollution6. Clean waterRenewable energySeawater0210 nano-technologybusinessDesalination and Water Treatment
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Investigation of electrode material – Redox couple systems for reverse electrodialysis processes. Part I: Iron redox couples

2012

Abstract The performances of electrodialysis (ED) and reverse electrodialysis (RED) processes depend on several factors, including the nature of the electrode material and of the redox couple adopted to make possible the conversion between electric power and chemical potential. In this paper, the possible utilization of iron-based redox couples (FeCl3/FeCl2, hexacyanoferrate(III)/hexacyanoferrate(II) and Fe(III)-EDTA/Fe(II)-EDTA) on graphite and DSA electrodes for RED processes was studied by a detailed experimental investigation. The hexacyanoferrate(III)/hexacyanoferrate(II) system was stable for long time (more than 12 days) in the absence of light and oxygen at high redox couple concent…

ChemistryGeneral Chemical EngineeringInorganic chemistry02 engineering and technology010501 environmental sciencesElectrodialysis021001 nanoscience & nanotechnologyElectrochemistry01 natural sciencesRedoxAnalytical Chemistrychemistry.chemical_compoundMembraneReversed electrodialysisNafionElectrodeElectrochemistryGraphite0210 nano-technology0105 earth and related environmental sciencesJournal of Electroanalytical Chemistry
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CLOSING THE LOOP: STUDY OF INTEGRATED CYCLES WITH NATURAL AND ARTIFICIAL SOLUTIONS FOR THE PRODUCTION OF ENERGY, MINERALS AND FRESH WATER

Circular economy Reverse electrodialysis Minerals recovery Magnesium Hydroxide Waste Heat to Power Salinity Gradient Heat Engine
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Thermodynamic characterisation of novel solutions for closed-loop reverse electrodialysis

2018

Closed-loop reverse electrodialysis is a novel technology to convert low-grade heat directly into electricity. It consists of a reverse electrodialysis unit coupled with a regeneration unit in which the waste-heat is used to restore the initial conditions of the two solutions. One of the most impor- tant advantages of closed-loop system is the possibility to select an ad-hoc salt solution to obtain high efficiency. In this regard, it is important to assess how the salt solution properties affect the performance of the energy generation and solution regeneration processes. The aim of this study is to analyse the effect of thermodynamic properties of non-conventional salt solutions within a R…

Closed loop reverse electrodialysis Multi-stage evaporative regeneration unit Potassium acetate Caesium acetate Osmotic coefficient Pitzer’s model
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Reverse electrodialysis heat engine for sustainable power production

2017

Abstract Reverse Electrodialysis Heat Engine (REDHE) is a promising technology to convert waste heat at temperatures lower than 100 °C into electric power. In the present work an overview of the possible regeneration methods is presented and the technological challenges for the development of the RED Heat Engine (REDHE) are identified. The potential of this power production cycle was investigated through a simplified mathematical model. In the first part of the work, several salts were singularly modelled as possible solutes in aqueous solutions feeding the RED unit and the corresponding optimal conditions were recognized via an optimization study. In the second part, three different RED He…

Closed loopSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciThermal efficiencyWork (thermodynamics)Combined cycle020209 energy02 engineering and technologyManagement Monitoring Policy and Law7. Clean energyModellingThermolytic saltlaw.inventionlawWaste heatReversed electrodialysisReverse electrodialysi0202 electrical engineering electronic engineering information engineeringProcess engineeringCivil and Structural EngineeringHeat engineWaste managementbusiness.industryChemistryMechanical EngineeringBuilding and ConstructionClosed loop; Heat engine; Modelling; Power production cycle; Reverse electrodialysis; Thermolytic salts; Civil and Structural Engineering; Building and Construction; Energy (all); Mechanical Engineering; Management Monitoring Policy and LawPower production cycle021001 nanoscience & nanotechnology6. Clean waterPower (physics)Energy (all)General EnergyElectric power0210 nano-technologybusinessHeat engineApplied Energy
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Cathodic reduction of hexavalent chromium coupled with electricity generation achieved by reverse-electrodialysis processes using salinity gradients

2014

Abstract A new approach for the simultaneous generation of electric energy and the treatment of waters contaminated by recalcitrant pollutants using salinity gradients was proposed. Reverse electrodialysis allows for the generation of electric energy from salinity gradients. Indeed, the utilization of different salt concentrations gives a potential difference between the electrodes which allows the generation of electric energy by using suitable electrolytes and an external circuit. The simultaneous generation of electric energy and the treatment of waters contaminated by Cr(VI) was successfully achieved for the first time by reverse electrodialysis processes using salinity gradients and pr…

Cr(VI)ChemistrySupporting electrolyteGeneral Chemical EngineeringElectrolytesalinity gradientVolumetric flow rateSalinitychemistry.chemical_compoundElectricity generationChemical engineeringStack (abstract data type)Waste water treatmentenergy generationEnvironmental chemistryReversed electrodialysisElectrochemistryreverse electrodialisyHexavalent chromium
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