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dc.contributor.authorTrinh, Thien Anen_US
dc.contributor.authorHan, Qien_US
dc.contributor.authorMa, Yunqiaoen_US
dc.contributor.authorChew, Jia Weien_US
dc.identifier.citationTrinh, T. A., Han, Q., Ma, Y. & Chew, J. W. (2019). Microfiltration of oil emulsions stabilized by different surfactants. Journal of Membrane Science, 579, 199-209.
dc.description.abstractMembrane-based filtration is a promising technique to treat the enormous amounts of oily wastewater, specifically those with micron-sized oil droplets. However, the understanding on the effect of the surfactants, that are inevitably present to stabilize the oil emulsion, on the filtration performance remains poor. This study aimed to investigate the effect of surfactant type (namely, non-ionic Tween 20, positively charged CTAB, and negatively charged SDS) on filtration flux and membrane fouling during the microfiltration of the surfactant-stabilized oil emulsion with mean droplet sizes of approximately 20 μm. The Optical Coherence Tomography (OCT) was employed to quantify the evolution of fouling, and both the DLVO and XDLVO models were used to quantify the oil droplet-membrane and oil droplet-deposited layer interaction energies. Two key understanding on the correlation between the DLVO and XDLVO predictions with flux and fouling were obtained. Firstly, the steep flux enhancement vis-à-vis a DI water feed by the feed containing CTAB-stabilized oil emulsion was tied to the attractive interaction of the surfactant with the membrane, as evident from the DLVO model. This attraction was not related to the extent of membrane fouling, which was relatively lesser for the CTAB-stabilized oil emulsion. Secondly, the extent of membrane fouling was tied to the repulsive energy magnitudes rather than attractive ones, specifically in that the least repulsive energy values of the Tween 20 – stabilized oil emulsion was linked to the most extensive fouling.en_US
dc.description.sponsorshipEconomic Development Board (EDB)en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.relation.ispartofJournal of Membrane Scienceen_US
dc.rights© 2019 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleMicrofiltration of oil emulsions stabilized by different surfactantsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Chemical and Biomedical Engineeringen_US
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.researchSingapore Membrane Technology Centreen_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.subject.keywordsMembrane Foulingen_US
dc.subject.keywordsInterfacial Energyen_US
dc.subject.keywordsOil Emulsionen_US
dc.description.acknowledgementWe acknowledge funding from the Singapore Ministry of Education Academic Research Funds Tier 2 (MOE2014-T2-2-074; ARC16/15) and Tier 1 (2015-T1-001-023; RG7/15), the GSK (GlaxoSmithKline) – EDB (Economic Development Board) Trust Fund, and the Joint Singapore Germany Research Project Fund (SGP-PROG3-019).en_US
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