Polyelectrolytes-promoted Forward Osmosis Processes

Handle URI:
http://hdl.handle.net/10754/552443
Title:
Polyelectrolytes-promoted Forward Osmosis Processes
Authors:
Ge, Q.C.; Ling, M.M.; Amy, Gary L.; Chung, T.S.
Abstract:
The development of the forward osmosis (FO) process has been constrained by the slow development of appropriate draw solutions. Two significant concerns related to draw solutions are the draw solute leakage and intensive-energy requirement in recycling draw solutes after the FO process. FO would be much attractive if there is no draw solute leakage and the recycle of draw solutes is easy and economic.In this study, polyelectrolytes of a series of polyacrylic acid sodium salts (PAA-Na), were explored as draw solutes in the FO process. The characteristics of high solubility in water and flexibility in structural configuration ensure the suitability of PAA-Na as draw solutes and their relative ease in recycle through pressure-driven ultrafiltration (UF) membrane processes. The high water flux with insignificant salt leakage in the FO process and the high salt rejection in UF recycle processes reveal the superiority of PAA-Na to conventional ionic salts, such as NaCl, when comparing their FO performance via the same membranes. The repeatable performance of PAA-Na after recycle indicates the absence of any aggregation problems. The overall performance demonstrates that polyelectrolytes of PAA-Na series are promising as draw solutes, and the new concept of using polyelectrolytes as draw solutes in FO processes is applicable. The magnetic nanoparticle draw solutes can generate reasonably high osmotic pressure in FO system due to the functional groups on the nanoparticles surface and they can be regenerated through magnetic field and reused as draw solutes. Thermo-responsive magnetic nanoparticles are able to be regenerated with high efficiency as the thermo-responsive property can assist the regeneration in a low-strength magnetic field.
KAUST Department:
King Abdullah University of Science and Technology, Saudi Arabia
Citation:
Polyelectrolytes-promoted Forward Osmosis Processes 2012, 44:256 Procedia Engineering
Journal:
Procedia Engineering
Issue Date:
7-Nov-2012
DOI:
10.1016/j.proeng.2012.08.378
Type:
Article
ISSN:
18777058
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S1877705812033905
Appears in Collections:
Articles

Full metadata record

DC FieldValue Language
dc.contributor.authorGe, Q.C.en
dc.contributor.authorLing, M.M.en
dc.contributor.authorAmy, Gary L.en
dc.contributor.authorChung, T.S.en
dc.date.accessioned2015-05-07T13:25:58Zen
dc.date.available2015-05-07T13:25:58Zen
dc.date.issued2012-11-07en
dc.identifier.citationPolyelectrolytes-promoted Forward Osmosis Processes 2012, 44:256 Procedia Engineeringen
dc.identifier.issn18777058en
dc.identifier.doi10.1016/j.proeng.2012.08.378en
dc.identifier.urihttp://hdl.handle.net/10754/552443en
dc.description.abstractThe development of the forward osmosis (FO) process has been constrained by the slow development of appropriate draw solutions. Two significant concerns related to draw solutions are the draw solute leakage and intensive-energy requirement in recycling draw solutes after the FO process. FO would be much attractive if there is no draw solute leakage and the recycle of draw solutes is easy and economic.In this study, polyelectrolytes of a series of polyacrylic acid sodium salts (PAA-Na), were explored as draw solutes in the FO process. The characteristics of high solubility in water and flexibility in structural configuration ensure the suitability of PAA-Na as draw solutes and their relative ease in recycle through pressure-driven ultrafiltration (UF) membrane processes. The high water flux with insignificant salt leakage in the FO process and the high salt rejection in UF recycle processes reveal the superiority of PAA-Na to conventional ionic salts, such as NaCl, when comparing their FO performance via the same membranes. The repeatable performance of PAA-Na after recycle indicates the absence of any aggregation problems. The overall performance demonstrates that polyelectrolytes of PAA-Na series are promising as draw solutes, and the new concept of using polyelectrolytes as draw solutes in FO processes is applicable. The magnetic nanoparticle draw solutes can generate reasonably high osmotic pressure in FO system due to the functional groups on the nanoparticles surface and they can be regenerated through magnetic field and reused as draw solutes. Thermo-responsive magnetic nanoparticles are able to be regenerated with high efficiency as the thermo-responsive property can assist the regeneration in a low-strength magnetic field.en
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S1877705812033905en
dc.rightsArchived with thanks to Procedia Engineering. http://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectForward osmosisen
dc.subjectdraw soluteen
dc.subjectwastewater treatmenten
dc.subjectultrafiltrationen
dc.titlePolyelectrolytes-promoted Forward Osmosis Processesen
dc.typeArticleen
dc.contributor.departmentKing Abdullah University of Science and Technology, Saudi Arabiaen
dc.identifier.journalProcedia Engineeringen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionNational University of Singapore, Singaporeen
kaust.authorAmy, Gary L.en
kaust.authorChung, Neal Tai-Shungen
kaust.authorGe, Qingchunen
kaust.authorLing, M. M.en
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