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Article: Modeling salt accumulation in osmotic membrane bioreactors: Implications for FO membrane selection and system operation

TitleModeling salt accumulation in osmotic membrane bioreactors: Implications for FO membrane selection and system operation
Authors
KeywordsForward Osmosis (Fo)
Osmotic Membrane Bioreactor (Ombr)
Salt Accumulation
Solute Reverse Diffusion
Volumetric Concentration Factor
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/memsci
Citation
Journal Of Membrane Science, 2011, v. 366 n. 1-2, p. 314-324 How to Cite?
AbstractNovel osmotic membrane bioreactors (OMBRs) have been recently reported in the literature. An OMBR uses a dense salt-rejecting forward osmosis (FO) membrane, which exhibits high retention of organic matter and various other contaminants. Meanwhile, the high rejection nature also leads to the accumulation of salts in the bioreactor, which can adversely affect the biological activities as well as the FO water flux. A salt accumulation model is developed in the current study. Our model suggests that both the bioreactor salt concentration and the FO water flux are controlled by membrane properties (water permeability A, salt permeability B, mass transfer coefficient K m, and membrane orientation relative to the draw solution) and the OMBR operational conditions (salt concentration of the influent wastewater, draw solution concentration, hydraulic retention time (HRT), and sludge retention time (SRT)). The salt accumulation is contributed by both the influent wastewater and the reverse diffusion of solutes from the draw solution, and is directly proportional to the volumetric concentration factor (i.e., the SRT/HRT ratio). The relative importance of reverse diffusion over contribution from influent solutes is governed by the membrane selectivity. For a relatively selective membrane (B/A ll;the osmotic pressure of the influent water), solute reverse diffusion has negligible effect on OMBR performance. In contrast, the salt accumulation and FO water flux reduction are governed by reverse diffusion for B/A greater than the osmotic pressure of the influent water. The current study reveals the critical importance of the B/A ratio and HRT/SRT ratio for optimized OMBR operation. © 2010 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/185393
ISSN
2015 Impact Factor: 5.557
2015 SCImago Journal Rankings: 2.042
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXiao, Den_US
dc.contributor.authorTang, CYen_US
dc.contributor.authorZhang, Jen_US
dc.contributor.authorLay, WCLen_US
dc.contributor.authorWang, Ren_US
dc.contributor.authorFane, AGen_US
dc.date.accessioned2013-07-30T07:32:10Z-
dc.date.available2013-07-30T07:32:10Z-
dc.date.issued2011en_US
dc.identifier.citationJournal Of Membrane Science, 2011, v. 366 n. 1-2, p. 314-324en_US
dc.identifier.issn0376-7388en_US
dc.identifier.urihttp://hdl.handle.net/10722/185393-
dc.description.abstractNovel osmotic membrane bioreactors (OMBRs) have been recently reported in the literature. An OMBR uses a dense salt-rejecting forward osmosis (FO) membrane, which exhibits high retention of organic matter and various other contaminants. Meanwhile, the high rejection nature also leads to the accumulation of salts in the bioreactor, which can adversely affect the biological activities as well as the FO water flux. A salt accumulation model is developed in the current study. Our model suggests that both the bioreactor salt concentration and the FO water flux are controlled by membrane properties (water permeability A, salt permeability B, mass transfer coefficient K m, and membrane orientation relative to the draw solution) and the OMBR operational conditions (salt concentration of the influent wastewater, draw solution concentration, hydraulic retention time (HRT), and sludge retention time (SRT)). The salt accumulation is contributed by both the influent wastewater and the reverse diffusion of solutes from the draw solution, and is directly proportional to the volumetric concentration factor (i.e., the SRT/HRT ratio). The relative importance of reverse diffusion over contribution from influent solutes is governed by the membrane selectivity. For a relatively selective membrane (B/A ll;the osmotic pressure of the influent water), solute reverse diffusion has negligible effect on OMBR performance. In contrast, the salt accumulation and FO water flux reduction are governed by reverse diffusion for B/A greater than the osmotic pressure of the influent water. The current study reveals the critical importance of the B/A ratio and HRT/SRT ratio for optimized OMBR operation. © 2010 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.subjectForward Osmosis (Fo)en_US
dc.subjectOsmotic Membrane Bioreactor (Ombr)en_US
dc.subjectSalt Accumulationen_US
dc.subjectSolute Reverse Diffusionen_US
dc.subjectVolumetric Concentration Factoren_US
dc.titleModeling salt accumulation in osmotic membrane bioreactors: Implications for FO membrane selection and system operationen_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.2010.10.023en_US
dc.identifier.scopuseid_2-s2.0-78649444934en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-78649444934&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume366en_US
dc.identifier.issue1-2en_US
dc.identifier.spage314en_US
dc.identifier.epage324en_US
dc.identifier.isiWOS:000285851600037-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridXiao, D=36679505700en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridZhang, J=14010227000en_US
dc.identifier.scopusauthoridLay, WCL=25225504600en_US
dc.identifier.scopusauthoridWang, R=35081334000en_US
dc.identifier.scopusauthoridFane, AG=35593963600en_US

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