Microfiltration of oil emulsions stabilized by different surfactants
Membrane-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 performanc...
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sg-ntu-dr.10356-1511542021-08-31T05:32:24Z Microfiltration of oil emulsions stabilized by different surfactants Trinh, Thien An Han, Qi Ma, Yunqiao Chew, Jia Wei School of Chemical and Biomedical Engineering Interdisciplinary Graduate School (IGS) Singapore Membrane Technology Centre Nanyang Environment and Water Research Institute Engineering::Environmental engineering Membrane Fouling Interfacial Energy Oil Emulsion Membrane-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. Economic Development Board (EDB) Ministry of Education (MOE) We 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). 2021-08-31T05:32:23Z 2021-08-31T05:32:23Z 2019 Journal Article Trinh, 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. https://dx.doi.org/10.1016/j.memsci.2019.02.068 0376-7388 https://hdl.handle.net/10356/151154 10.1016/j.memsci.2019.02.068 2-s2.0-85062409960 579 199 209 en MOE2014-T2-2-074 ARC16/15 2015-T1-001-023 RG7/15 SGP-PROG3-019 Journal of Membrane Science © 2019 Elsevier B.V. All rights reserved. |
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Engineering::Environmental engineering Membrane Fouling Interfacial Energy Oil Emulsion Trinh, Thien An Han, Qi Ma, Yunqiao Chew, Jia Wei Microfiltration of oil emulsions stabilized by different surfactants |
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Membrane-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. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Trinh, Thien An Han, Qi Ma, Yunqiao Chew, Jia Wei |
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Article |
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Trinh, Thien An Han, Qi Ma, Yunqiao Chew, Jia Wei |
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Trinh, Thien An |
title |
Microfiltration of oil emulsions stabilized by different surfactants |
title_short |
Microfiltration of oil emulsions stabilized by different surfactants |
title_full |
Microfiltration of oil emulsions stabilized by different surfactants |
title_fullStr |
Microfiltration of oil emulsions stabilized by different surfactants |
title_full_unstemmed |
Microfiltration of oil emulsions stabilized by different surfactants |
title_sort |
microfiltration of oil emulsions stabilized by different surfactants |
publishDate |
2021 |
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https://hdl.handle.net/10356/151154 |
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1709685342261477376 |