Search results for " Reverse electrodialysis"

showing 10 items of 39 documents

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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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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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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Exergy analysis and thermoeconomic cost accounting of a CHP steam cycle integrated with MED-TVC desalination

2016

In this paper exergy analysis and thermoeconomic cost accounting of a CHP steam cycle integrated with MED-TVC plant is performed; the purpose is to show how this methodology provides a rational criterion to allocate production costs on electricity and freshwater. After a brief overview on methodology and a description of reference plant, exergy analysis is carried out in order to calculate exergy flows and plant exergetic performance. A detailed description of the adopted thermoeconomic model is given. Cost accounting is performed considering two scenarios: in the first, the concentrated brine is disposed back to sea, thus being its exergy content definitively wasted; in the second, convers…

Desalination multiple effect evaporation thermal vapour compression dual purpose plant exergy thermoeconomic cost cost accounting reverse electrodialysisSettore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciSettore ING-IND/10 - Fisica Tecnica Industriale
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Assisted reverse electrodialysis for CO2 electrochemical conversion and treatment of wastewater: A new approach towards more eco-friendly processes u…

2020

Abstract In this paper, the utilization of assisted reverse electrodialysis (A-RED), recently used for pre-desalination, is proposed as a general method to reduce the energy requirements of electrolysis processes and evaluated for two model processes: (i) the cathodic conversion of carbon dioxide to formic acid; (ii) the anodic treatment of water contaminated by organics. In A-RED, two solutions with different salt content and an external potential difference, applied in the direction of the natural salinity gradient, are both used to drive redox processes. It was shown, for the first time, that the cathodic conversion of CO2 to formic acid can be performed by both reverse electrodialysis (…

ElectrolysisChemistryFormic acidGeneral Chemical Engineering02 engineering and technologySettore ING-IND/27 - Chimica Industriale E Tecnologica010402 general chemistry021001 nanoscience & nanotechnologyElectrochemistryPulp and paper industry01 natural sciences0104 chemical scienceslaw.inventionCathodic protectionAnodeSalinitychemistry.chemical_compoundWastewaterlawReversed electrodialysisReverse electrodialysis (RED)Assisted reverse electrodialysis (A-RED)Conversion of carbon dioxideWastewater treatmentElectrochemistry0210 nano-technologyElectrochimica Acta
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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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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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