Forward osmosis for water recovery using polyelectrolyte PolyDADMAC and DADMAC draw solutions as a low pressure energy saving process

dc.contributor.authorHamad, Mohammed J.A.
dc.contributor.authorChirwa, Evans M.N.
dc.date.accessioned2019-02-20T08:57:49Z
dc.date.issued2019-03
dc.description.abstractPolydiallyldimethylammonium Chloride (PolyDADMAC) is a cationic polyelectrolyte utilised widely in drinking water industry. This study has evaluated the performance of cationic organic polyelectrolyte PolyDADMAC and its monomer DADMAC as osmotic agents in Forward Osmosis (FO) process. The properties of PolyDADMAC and DADMAC draw solutions were initially studied. Thereafter, a series of experiments were conducted to examine the efficiency of these solutions for water recovery using CTA and Aquaporin flatsheet membranes under FO mode. The results show a high electrical conductivity of both draw solutions due to the presence of strong cation electrolyte (C8H6N+) in solutions. The obtained water flux and reverse solute diffusion of DADMAC were higher than PolyDADMAC at same concentrations. Factors contributing to the change of water flux and reverse solutes diffusion through membranes were addressed. CTA membranes accomplished higher water flux than the aquaporin membranes, however; the latter was more selective and provided better results of reverse solutes diffusion. Diluted draw solutions were reconcentrated via Nanofiltration-system. High ion rejection of DADMAC (96%) and poor ion rejection of PolyDADMAC (85%) were observed. Lastly, this article introduced a valuable comparison between cationic polyelectrolyte and its electrolyte based on their behaviours as draw solutes in FO process.en_ZA
dc.description.departmentChemical Engineeringen_ZA
dc.description.embargo2020-03-01
dc.description.librarianhj2019en_ZA
dc.description.sponsorshipThe National Research Foundation NRF (Grant Unique Number: 100471), and the University of Pretoria, South Africa.en_ZA
dc.description.urihttp://www.elsevier.com/locate/desalen_ZA
dc.identifier.citationHamad M.J.A. & Chirwa E.M.N. 2019, 'Forward osmosis for water recovery using polyelectrolyte PolyDADMAC and DADMAC draw solutions as a low pressure energy saving process', Desalination, vol. 453, pp. 89-101.en_ZA
dc.identifier.issn0011-9164 (print)
dc.identifier.issn1873-4464 (online)
dc.identifier.other10.1016/j.desal.2018.11.016
dc.identifier.urihttp://hdl.handle.net/2263/68484
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2018 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Desalination. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Desalination, vol. 453, pp. 89-101, 2019. doi : 10.1016/j.desal.2018.11.016.en_ZA
dc.subjectForward osmosis (FO)en_ZA
dc.subjectDesalinationen_ZA
dc.subjectWater recoveryen_ZA
dc.subjectAquaporin protein membraneen_ZA
dc.subjectCationic polyelectrolyteen_ZA
dc.subjectDraw solutionen_ZA
dc.subjectDiallyldimethylammonium chloride (DADMAC)en_ZA
dc.subjectPolydiallyldimethylammonium chloride (PolyDADMAC)en_ZA
dc.subjectSolutionen_ZA
dc.subjectOsmosisen_ZA
dc.subjectLow pressureen_ZA
dc.subjectEnergy efficiencyen_ZA
dc.subjectElectrolyteen_ZA
dc.subjectPotable wateren_ZA
dc.subjectProtein membraneen_ZA
dc.subjectRecoveryen_ZA
dc.subjectPolyelectrolytesen_ZA
dc.subjectMembranesen_ZA
dc.subjectEnergy conservationen_ZA
dc.subjectChlorine compoundsen_ZA
dc.titleForward osmosis for water recovery using polyelectrolyte PolyDADMAC and DADMAC draw solutions as a low pressure energy saving processen_ZA
dc.typePostprint Articleen_ZA

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