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Article: Coupled effects of internal concentration polarization and fouling on flux behavior of forward osmosis membranes during humic acid filtration

TitleCoupled effects of internal concentration polarization and fouling on flux behavior of forward osmosis membranes during humic acid filtration
Authors
KeywordsForward Osmosis (Fo)
Fouling
Internal Concentration Polarization (Icp)
Membrane Orientation
Pore Plugging Enhanced Internal Concentration Polarization
Issue Date2010
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal Of Membrane Science, 2010, v. 354 n. 1-2, p. 123-133 How to Cite?
AbstractForward osmosis (FO) is attracting increasing interest for its potential applications in water and wastewater treatment and desalination. One of the major drawbacks of FO is internal concentration polarization (ICP), which significantly limits the FO flux efficiency. In addition, FO membrane flux can be adversely affected by membrane fouling. The effects of ICP and fouling on FO flux behavior were systematically investigated in the current study. Both theoretical model and experimental results demonstrated that the FO flux was highly non-linear with respect to the apparent driving force (the concentration difference between the draw solution and the feed water) as a result of ICP. ICP played a dominant role on FO flux behavior at greater draw solution concentrations and/or greater membrane fluxes due to the exponential dependence of ICP on flux level. Compared to the active layer facing draw solution (AL-facing-DS) configuration, more severe ICP was observed when the membrane active layer faced the feed water (AL-facing-FW) as a result of dilutive ICP in the FO support layer. Interestingly, the AL-facing-FW configuration showed remarkable flux stability against both dilution of the bulk draw solution and membrane fouling. In this configuration, any attempt to reduce membrane flux was compensated by a reduced level of ICP. The net result was only a marginal flux reduction. In addition, foulant deposition was insignificant in this configuration. Thus, the AL-facing-FW configuration enjoyed inherently stable flux, however, at the expense of severer initial ICP. In contrast, the AL-facing-DS configuration suffered severe flux reduction as porous membrane support faced the humic acid containing feed water. The flux loss in this configuration was likely due to the combined effects of (1) the internal clogging of the FO support structure as well as (2) the resulting enhanced ICP in the support layer. The latter was caused by reduced porosity and reduced mass transfer coefficient of the support. The pore clogging enhanced ICP mechanism probably played a dominant role in FO flux reduction at higher flux levels. To the authors' best knowledge, this is the first study to systematically demonstrate the coupled effects of ICP and fouling on the FO flux behavior. © 2010 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/185388
ISSN
2015 Impact Factor: 5.557
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTang, CYen_US
dc.contributor.authorShe, Qen_US
dc.contributor.authorLay, WCLen_US
dc.contributor.authorWang, Ren_US
dc.contributor.authorFane, AGen_US
dc.date.accessioned2013-07-30T07:32:08Z-
dc.date.available2013-07-30T07:32:08Z-
dc.date.issued2010en_US
dc.identifier.citationJournal Of Membrane Science, 2010, v. 354 n. 1-2, p. 123-133en_US
dc.identifier.issn0376-7388en_US
dc.identifier.urihttp://hdl.handle.net/10722/185388-
dc.description.abstractForward osmosis (FO) is attracting increasing interest for its potential applications in water and wastewater treatment and desalination. One of the major drawbacks of FO is internal concentration polarization (ICP), which significantly limits the FO flux efficiency. In addition, FO membrane flux can be adversely affected by membrane fouling. The effects of ICP and fouling on FO flux behavior were systematically investigated in the current study. Both theoretical model and experimental results demonstrated that the FO flux was highly non-linear with respect to the apparent driving force (the concentration difference between the draw solution and the feed water) as a result of ICP. ICP played a dominant role on FO flux behavior at greater draw solution concentrations and/or greater membrane fluxes due to the exponential dependence of ICP on flux level. Compared to the active layer facing draw solution (AL-facing-DS) configuration, more severe ICP was observed when the membrane active layer faced the feed water (AL-facing-FW) as a result of dilutive ICP in the FO support layer. Interestingly, the AL-facing-FW configuration showed remarkable flux stability against both dilution of the bulk draw solution and membrane fouling. In this configuration, any attempt to reduce membrane flux was compensated by a reduced level of ICP. The net result was only a marginal flux reduction. In addition, foulant deposition was insignificant in this configuration. Thus, the AL-facing-FW configuration enjoyed inherently stable flux, however, at the expense of severer initial ICP. In contrast, the AL-facing-DS configuration suffered severe flux reduction as porous membrane support faced the humic acid containing feed water. The flux loss in this configuration was likely due to the combined effects of (1) the internal clogging of the FO support structure as well as (2) the resulting enhanced ICP in the support layer. The latter was caused by reduced porosity and reduced mass transfer coefficient of the support. The pore clogging enhanced ICP mechanism probably played a dominant role in FO flux reduction at higher flux levels. To the authors' best knowledge, this is the first study to systematically demonstrate the coupled effects of ICP and fouling on the FO flux behavior. © 2010 Elsevier B.V. All rights reserved.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.subjectForward Osmosis (Fo)en_US
dc.subjectFoulingen_US
dc.subjectInternal Concentration Polarization (Icp)en_US
dc.subjectMembrane Orientationen_US
dc.subjectPore Plugging Enhanced Internal Concentration Polarizationen_US
dc.titleCoupled effects of internal concentration polarization and fouling on flux behavior of forward osmosis membranes during humic acid filtrationen_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.2010.02.059en_US
dc.identifier.scopuseid_2-s2.0-77950368132en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77950368132&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume354en_US
dc.identifier.issue1-2en_US
dc.identifier.spage123en_US
dc.identifier.epage133en_US
dc.identifier.isiWOS:000277947600017-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridShe, Q=34868602200en_US
dc.identifier.scopusauthoridLay, WCL=25225504600en_US
dc.identifier.scopusauthoridWang, R=35081334000en_US
dc.identifier.scopusauthoridFane, AG=35593963600en_US

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