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Article: The role of hydrodynamic conditions and pH on algal-rich water fouling of ultrafiltration

TitleThe role of hydrodynamic conditions and pH on algal-rich water fouling of ultrafiltration
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. 15, p. 4783-4789 How to Cite?
AbstractThe aim of this paper was to study the membrane fouling phenomena by eutrophic water using Microcystis aeruginosa under various operational conditions (flux and air flow rate) and solution chemistry (pH). All the experiments were performed in a lab scale employing the polyvinyl chloride ultrafiltration membrane with nominal cut-off of 10 kDa. A slight fouling appeared at the flux not more than 10 L/m 2/h, and the trend of trans-membrane pressure (TMP) development varied as a function of flux from linear to exponential with the increase of cell concentration. This paper also studied an important consideration of aeration in algal fouling: shear force. Besides alleviating membrane fouling, the shear produced by the bubbling should take responsible for the breakup of cells and the release of intracellular organic matters which caused the rate of the TMP increase closed to that without aeration. The optimum aeration intensity was observed to be 2.5 m 3/m 2/h in this experimental condition. As another important parameter considered in the study, the pH value of the raw water changed the physical and chemical reaction between the membrane and foulants or themselves. The results showed that the final TMP reduced with the pH increase due to the electro-static repulsion strengthening between the macromolecules which developed a looser gel. The most severe fouling was obtained at pH 5.0 near to the iso-electric point of algal solution, where electrostatic repulsion between algal cells was weakest. Furthermore, low pH value had a negative impact on cell integrity which gave rise to much more dissolved algogenic organic matter in the solution. It also played a part role on the membrane fouling. © 2012 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/185427
ISSN
2015 Impact Factor: 5.991
2015 SCImago Journal Rankings: 2.772
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZhang, Yen_US
dc.contributor.authorTang, CYen_US
dc.contributor.authorLi, Gen_US
dc.date.accessioned2013-07-30T07:32:27Z-
dc.date.available2013-07-30T07:32:27Z-
dc.date.issued2012en_US
dc.identifier.citationWater Research, 2012, v. 46 n. 15, p. 4783-4789en_US
dc.identifier.issn0043-1354en_US
dc.identifier.urihttp://hdl.handle.net/10722/185427-
dc.description.abstractThe aim of this paper was to study the membrane fouling phenomena by eutrophic water using Microcystis aeruginosa under various operational conditions (flux and air flow rate) and solution chemistry (pH). All the experiments were performed in a lab scale employing the polyvinyl chloride ultrafiltration membrane with nominal cut-off of 10 kDa. A slight fouling appeared at the flux not more than 10 L/m 2/h, and the trend of trans-membrane pressure (TMP) development varied as a function of flux from linear to exponential with the increase of cell concentration. This paper also studied an important consideration of aeration in algal fouling: shear force. Besides alleviating membrane fouling, the shear produced by the bubbling should take responsible for the breakup of cells and the release of intracellular organic matters which caused the rate of the TMP increase closed to that without aeration. The optimum aeration intensity was observed to be 2.5 m 3/m 2/h in this experimental condition. As another important parameter considered in the study, the pH value of the raw water changed the physical and chemical reaction between the membrane and foulants or themselves. The results showed that the final TMP reduced with the pH increase due to the electro-static repulsion strengthening between the macromolecules which developed a looser gel. The most severe fouling was obtained at pH 5.0 near to the iso-electric point of algal solution, where electrostatic repulsion between algal cells was weakest. Furthermore, low pH value had a negative impact on cell integrity which gave rise to much more dissolved algogenic organic matter in the solution. It also played a part role on the membrane fouling. © 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.meshCyanobacteria - Growth & Developmenten_US
dc.subject.meshHydrogen-Ion Concentrationen_US
dc.subject.meshUltrafiltration - Methodsen_US
dc.titleThe role of hydrodynamic conditions and pH on algal-rich water fouling of ultrafiltrationen_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.2012.06.020en_US
dc.identifier.pmid22770966-
dc.identifier.scopuseid_2-s2.0-84864062033en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84864062033&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume46en_US
dc.identifier.issue15en_US
dc.identifier.spage4783en_US
dc.identifier.epage4789en_US
dc.identifier.isiWOS:000307425500021-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridZhang, Y=36563079500en_US
dc.identifier.scopusauthoridTang, CY=35489259800en_US
dc.identifier.scopusauthoridLi, G=7407050743en_US

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