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Article: Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes

TitleRelating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes
Authors
Issue Date2012
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watres
Citation
Water Research, 2012, v. 46 n. 7, p. 2478-2486 How to Cite?
AbstractOsmotically driven membrane processes, such as forward osmosis (FO) and pressure retarded osmosis (PRO), are attracting increasing interest in research and applications in environment and energy related fields. In this study, we systematically investigated the alginate fouling on an osmotic membrane during FO operation using four types of draw solutions (NaCl, MgCl 2, CaCl 2 and Ca(NO 3) 2) to elucidate the relationships between reverse (from draw solution to feed solution) and forward (from feed solution to draw solution) solute diffusion, and membrane fouling. At the same water flux level (achieved by adjusting the draw solution concentration), the greatest reverse solute diffusion rate was observed for NaCl draw solution, followed by Ca(NO 3) 2 draw solution, and then CaCl 2 draw solution and MgCl 2 draw solution, the order of which was consistent with that of their solute permeability coefficients. Moreover, the reverse solute diffusion of draw solute (especially divalent cation) can change the feed solution chemistry and thus enhance membrane fouling by alginate, the extent of which is related to the rate of the reverse draw solute diffusion and its ability to interact with the foulant. The extent of fouling for the four types of draw solution followed an order of Ca(NO 3) 2 > CaCl 2 >> MgCl 2 > NaCl. On the other hand, the rate of forward diffusion of feed solute (e.g., Na +) was in turn promoted under severe membrane fouling in active layer facing draw solution orientation, which may be attributed to the fouling enhanced concentration polarization (pore clogging enhanced ICP and cake enhanced concentration polarization). The enhanced concentration polarization can lead to additional water flux reduction and is an important mechanism governing the water flux behavior during FO membrane fouling. Findings have significant implications for the draw solution selection and membrane fouling control in osmotically driven membrane processes. © 2012 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/185422
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorShe, Qen_US
dc.contributor.authorJin, Xen_US
dc.contributor.authorLi, Qen_US
dc.contributor.authorTang, CYen_US
dc.date.accessioned2013-07-30T07:32:25Z-
dc.date.available2013-07-30T07:32:25Z-
dc.date.issued2012en_US
dc.identifier.citationWater Research, 2012, v. 46 n. 7, p. 2478-2486en_US
dc.identifier.issn0043-1354en_US
dc.identifier.urihttp://hdl.handle.net/10722/185422-
dc.description.abstractOsmotically driven membrane processes, such as forward osmosis (FO) and pressure retarded osmosis (PRO), are attracting increasing interest in research and applications in environment and energy related fields. In this study, we systematically investigated the alginate fouling on an osmotic membrane during FO operation using four types of draw solutions (NaCl, MgCl 2, CaCl 2 and Ca(NO 3) 2) to elucidate the relationships between reverse (from draw solution to feed solution) and forward (from feed solution to draw solution) solute diffusion, and membrane fouling. At the same water flux level (achieved by adjusting the draw solution concentration), the greatest reverse solute diffusion rate was observed for NaCl draw solution, followed by Ca(NO 3) 2 draw solution, and then CaCl 2 draw solution and MgCl 2 draw solution, the order of which was consistent with that of their solute permeability coefficients. Moreover, the reverse solute diffusion of draw solute (especially divalent cation) can change the feed solution chemistry and thus enhance membrane fouling by alginate, the extent of which is related to the rate of the reverse draw solute diffusion and its ability to interact with the foulant. The extent of fouling for the four types of draw solution followed an order of Ca(NO 3) 2 > CaCl 2 >> MgCl 2 > NaCl. On the other hand, the rate of forward diffusion of feed solute (e.g., Na +) was in turn promoted under severe membrane fouling in active layer facing draw solution orientation, which may be attributed to the fouling enhanced concentration polarization (pore clogging enhanced ICP and cake enhanced concentration polarization). The enhanced concentration polarization can lead to additional water flux reduction and is an important mechanism governing the water flux behavior during FO membrane fouling. Findings have significant implications for the draw solution selection and membrane fouling control in osmotically driven membrane processes. © 2012 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/watresen_US
dc.relation.ispartofWater Researchen_US
dc.subject.meshAlginates - Analysisen_US
dc.subject.meshBiofoulingen_US
dc.subject.meshCalcium Chloride - Chemistryen_US
dc.subject.meshCalcium Compounds - Chemistryen_US
dc.subject.meshMagnesium Chloride - Chemistryen_US
dc.subject.meshMembranes, Artificialen_US
dc.subject.meshModels, Chemicalen_US
dc.subject.meshNitrates - Chemistryen_US
dc.subject.meshOsmosisen_US
dc.subject.meshSodium Chloride - Chemistryen_US
dc.subject.meshWater Movementsen_US
dc.titleRelating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processesen_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.watres.2012.02.024en_US
dc.identifier.pmid22386887-
dc.identifier.scopuseid_2-s2.0-84862780487en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84862780487&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume46en_US
dc.identifier.issue7en_US
dc.identifier.spage2478en_US
dc.identifier.epage2486en_US
dc.identifier.isiWOS:000302645300044-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridShe, Q=34868602200en_US
dc.identifier.scopusauthoridJin, X=7402589561en_US
dc.identifier.scopusauthoridLi, Q=7405856151en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US

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