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Article: Organic fouling in pressure retarded osmosis: Experiments, mechanisms and implications

TitleOrganic fouling in pressure retarded osmosis: Experiments, mechanisms and implications
Authors
KeywordsCritical Draw Solution Concentration
Forward Osmosis (Fo)
Fouling
Pressure Retarded Osmosis (Pro)
Reverse Solute Diffusion Enhanced Fouling
Issue Date2013
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal Of Membrane Science, 2013, v. 428, p. 181-189 How to Cite?
AbstractPressure retarded osmosis (PRO) is an osmotically-driven membrane process and it has attracted increasing interest for salinity-gradient power harvesting. However, the PRO performance (both water flux and power density) can be significantly limited by membrane fouling. This study, for the first time, systematically investigated membrane fouling by organic foulants in PRO process and its effect on PRO power density. It was found that significant alginate fouling occurred when the draw solution (DS) contained large quantities of divalent cations (i.e., Ca2+ and/or Mg2+). This is attributed to the reverse solute diffusion enhanced organic fouling, the effect of which is related to (1) the type of draw solute and the rate of its diffusion into the feed solution (FS), and (2) its ability to interact with feed foulant. It was also found that the increase of DS concentration exacerbated the PRO fouling due to the synergistic effects of increased reverse solute diffusion and increased initial water flux level. However, the increase of applied hydraulic pressure mitigated the alginate fouling for NaCl draw solution but exacerbated the alginate fouling for CaCl2 draw solution due to the competing effects between the increased reverse solute diffusion and the reduced initial water flux. It was further found that the alginate fouling was more severe under PRO operation than that under forward osmosis (FO) operation at an identical initial water flux level using seawater-based DSs due to the faster reverse solute diffusion under PRO operation. Our results provide significant implications for PRO fouling control. © 2012 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/185436
ISSN
2015 Impact Factor: 5.557
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShe, Qen_US
dc.contributor.authorWong, YKWen_US
dc.contributor.authorZhao, Sen_US
dc.contributor.authorTang, CYen_US
dc.date.accessioned2013-07-30T07:32:31Z-
dc.date.available2013-07-30T07:32:31Z-
dc.date.issued2013en_US
dc.identifier.citationJournal Of Membrane Science, 2013, v. 428, p. 181-189en_US
dc.identifier.issn0376-7388en_US
dc.identifier.urihttp://hdl.handle.net/10722/185436-
dc.description.abstractPressure retarded osmosis (PRO) is an osmotically-driven membrane process and it has attracted increasing interest for salinity-gradient power harvesting. However, the PRO performance (both water flux and power density) can be significantly limited by membrane fouling. This study, for the first time, systematically investigated membrane fouling by organic foulants in PRO process and its effect on PRO power density. It was found that significant alginate fouling occurred when the draw solution (DS) contained large quantities of divalent cations (i.e., Ca2+ and/or Mg2+). This is attributed to the reverse solute diffusion enhanced organic fouling, the effect of which is related to (1) the type of draw solute and the rate of its diffusion into the feed solution (FS), and (2) its ability to interact with feed foulant. It was also found that the increase of DS concentration exacerbated the PRO fouling due to the synergistic effects of increased reverse solute diffusion and increased initial water flux level. However, the increase of applied hydraulic pressure mitigated the alginate fouling for NaCl draw solution but exacerbated the alginate fouling for CaCl2 draw solution due to the competing effects between the increased reverse solute diffusion and the reduced initial water flux. It was further found that the alginate fouling was more severe under PRO operation than that under forward osmosis (FO) operation at an identical initial water flux level using seawater-based DSs due to the faster reverse solute diffusion under PRO operation. Our results provide significant implications for PRO fouling control. © 2012 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memscien_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.subjectCritical Draw Solution Concentrationen_US
dc.subjectForward Osmosis (Fo)en_US
dc.subjectFoulingen_US
dc.subjectPressure Retarded Osmosis (Pro)en_US
dc.subjectReverse Solute Diffusion Enhanced Foulingen_US
dc.titleOrganic fouling in pressure retarded osmosis: Experiments, mechanisms and implicationsen_US
dc.typeArticleen_US
dc.identifier.emailTang, CY: tangc@hku.hken_US
dc.identifier.authorityTang, CY=rp01765en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.memsci.2012.10.045en_US
dc.identifier.scopuseid_2-s2.0-84870876389en_US
dc.identifier.hkuros231351-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84870876389&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume428en_US
dc.identifier.spage181en_US
dc.identifier.epage189en_US
dc.identifier.isiWOS:000313653700022-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridShe, Q=34868602200en_US
dc.identifier.scopusauthoridWong, YKW=55520052300en_US
dc.identifier.scopusauthoridZhao, S=38562647400en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US

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