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Experimental and Theoretical Characterization of Commercial Nanofiltration Membranes for the Treatment of Ion Exchange Spent Brine

Micari, Marina and Diamantidou, Dionysia and Heijman, Bas and Moser, Massimo and Haidari, Amir and Spanjers, Henri and Bertsch, Valentin (2020) Experimental and Theoretical Characterization of Commercial Nanofiltration Membranes for the Treatment of Ion Exchange Spent Brine. Journal of Membrane Science. Elsevier. doi: 10.1016/j.memsci.2020.118117. ISSN 0376-7388.

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This work presents a joint experimental and simulation campaign aimed at characterizing two nanofiltration membranes (TS80 and NF270) in the presence of a multi-ionic water solution simulating the spent regenerant of cationic ion exchange resins employed for water softening. We identified the membrane parameters, which allowed for predicting the performances through the Donnan Steric Pore Model with Dielectric Exclusion. A good agreement between model and experimental trends of rejection as a function of the applied pressure was observed (error < 15%). The analysis of trans-membrane fluxes and exclusion coefficients showed that dielectric exclusion was the crucial mechanism for the ionic partition. In fact, the lower pore dielectric constant found for TS80 justified the higher rejections to divalent cations with respect to NF270. Moreover, negative charge densities were found for both membranes, because of the high concentration of chloride ions in the feed, which likely adsorbed onto the membrane. However, it was observed that the experimental rejections did not change significantly with the feed pH. This result, in line with the minor role of the Donnan exclusion resulting from the model, suggested that the membrane performances were not much affected by the charge density at high feed ionic strengths (~1 M).

Item URL in elib:https://elib.dlr.de/135020/
Document Type:Article
Title:Experimental and Theoretical Characterization of Commercial Nanofiltration Membranes for the Treatment of Ion Exchange Spent Brine
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Diamantidou, DionysiaLenntech, Water Treatment SolutionsUNSPECIFIEDUNSPECIFIED
Heijman, BasDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Haidari, AmirDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Spanjers, HenriDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Bertsch, ValentinUniversity of BochumUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Journal of Membrane Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Series Name:Elsevier
Keywords:Nanofiltration Wastewater treatment Membrane characterization Ionic rejection Water softening
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Energy Systems Technology (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Energy Systems Analysis
Deposited By: Micari, Marina
Deposited On:20 May 2020 13:43
Last Modified:23 Oct 2023 14:08

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