Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration
The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Mem...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Zhu, Xiaobo [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017transfer abstract |
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| Schlagwörter: |
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| Umfang: |
11 |
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| Übergeordnetes Werk: |
Enthalten in: Steering charge kinetics in W - Yue, Xin-Zheng ELSEVIER, 2019, the official journal of the North American Membrane Society, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:529 ; year:2017 ; day:1 ; month:05 ; pages:159-169 ; extent:11 |
| Links: |
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| DOI / URN: |
10.1016/j.memsci.2017.02.004 |
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ELV025324063 |
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| 520 | |a The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. | ||
| 520 | |a The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. | ||
| 650 | 7 | |a Nanofiltration |2 Elsevier | |
| 650 | 7 | |a Ultrafiltration |2 Elsevier | |
| 650 | 7 | |a Membrane surface wetting |2 Elsevier | |
| 650 | 7 | |a Oil-water separation |2 Elsevier | |
| 650 | 7 | |a Surfactant |2 Elsevier | |
| 700 | 1 | |a Dudchenko, Alexander |4 oth | |
| 700 | 1 | |a Gu, Xiaotian |4 oth | |
| 700 | 1 | |a Jassby, David |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Yue, Xin-Zheng ELSEVIER |t Steering charge kinetics in W |d 2019 |d the official journal of the North American Membrane Society |g New York, NY [u.a.] |w (DE-627)ELV002478420 |
| 773 | 1 | 8 | |g volume:529 |g year:2017 |g day:1 |g month:05 |g pages:159-169 |g extent:11 |
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10.1016/j.memsci.2017.02.004 doi GBV00000000000375.pica (DE-627)ELV025324063 (ELSEVIER)S0376-7388(16)32619-9 DE-627 ger DE-627 rakwb eng 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Zhu, Xiaobo verfasserin aut Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. Nanofiltration Elsevier Ultrafiltration Elsevier Membrane surface wetting Elsevier Oil-water separation Elsevier Surfactant Elsevier Dudchenko, Alexander oth Gu, Xiaotian oth Jassby, David oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:529 year:2017 day:1 month:05 pages:159-169 extent:11 https://doi.org/10.1016/j.memsci.2017.02.004 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 529 2017 1 0501 159-169 11 |
| spelling |
10.1016/j.memsci.2017.02.004 doi GBV00000000000375.pica (DE-627)ELV025324063 (ELSEVIER)S0376-7388(16)32619-9 DE-627 ger DE-627 rakwb eng 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Zhu, Xiaobo verfasserin aut Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. Nanofiltration Elsevier Ultrafiltration Elsevier Membrane surface wetting Elsevier Oil-water separation Elsevier Surfactant Elsevier Dudchenko, Alexander oth Gu, Xiaotian oth Jassby, David oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:529 year:2017 day:1 month:05 pages:159-169 extent:11 https://doi.org/10.1016/j.memsci.2017.02.004 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 529 2017 1 0501 159-169 11 |
| allfields_unstemmed |
10.1016/j.memsci.2017.02.004 doi GBV00000000000375.pica (DE-627)ELV025324063 (ELSEVIER)S0376-7388(16)32619-9 DE-627 ger DE-627 rakwb eng 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Zhu, Xiaobo verfasserin aut Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. Nanofiltration Elsevier Ultrafiltration Elsevier Membrane surface wetting Elsevier Oil-water separation Elsevier Surfactant Elsevier Dudchenko, Alexander oth Gu, Xiaotian oth Jassby, David oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:529 year:2017 day:1 month:05 pages:159-169 extent:11 https://doi.org/10.1016/j.memsci.2017.02.004 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 529 2017 1 0501 159-169 11 |
| allfieldsGer |
10.1016/j.memsci.2017.02.004 doi GBV00000000000375.pica (DE-627)ELV025324063 (ELSEVIER)S0376-7388(16)32619-9 DE-627 ger DE-627 rakwb eng 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Zhu, Xiaobo verfasserin aut Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. Nanofiltration Elsevier Ultrafiltration Elsevier Membrane surface wetting Elsevier Oil-water separation Elsevier Surfactant Elsevier Dudchenko, Alexander oth Gu, Xiaotian oth Jassby, David oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:529 year:2017 day:1 month:05 pages:159-169 extent:11 https://doi.org/10.1016/j.memsci.2017.02.004 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 529 2017 1 0501 159-169 11 |
| allfieldsSound |
10.1016/j.memsci.2017.02.004 doi GBV00000000000375.pica (DE-627)ELV025324063 (ELSEVIER)S0376-7388(16)32619-9 DE-627 ger DE-627 rakwb eng 540 VZ 35.17 bkl 58.50 bkl 43.12 bkl Zhu, Xiaobo verfasserin aut Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration 2017transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. Nanofiltration Elsevier Ultrafiltration Elsevier Membrane surface wetting Elsevier Oil-water separation Elsevier Surfactant Elsevier Dudchenko, Alexander oth Gu, Xiaotian oth Jassby, David oth Enthalten in Elsevier Yue, Xin-Zheng ELSEVIER Steering charge kinetics in W 2019 the official journal of the North American Membrane Society New York, NY [u.a.] (DE-627)ELV002478420 volume:529 year:2017 day:1 month:05 pages:159-169 extent:11 https://doi.org/10.1016/j.memsci.2017.02.004 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U SSG-OLC-PHA 35.17 Katalyse VZ 58.50 Umwelttechnik: Allgemeines VZ 43.12 Umweltchemie VZ AR 529 2017 1 0501 159-169 11 |
| language |
English |
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Enthalten in Steering charge kinetics in W New York, NY [u.a.] volume:529 year:2017 day:1 month:05 pages:159-169 extent:11 |
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Surfactant-stabilized oil separation from water using ultrafiltration and nanofiltration |
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The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. |
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The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. |
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The treatment of oily wastewater containing well-stabilized oil emulsions remains a challenge. As gravity-based separation methods cannot effectively remove emulsified oil droplets with sizes below 10µm, water polishing steps need to be applied to reduce the organic load of the treated effluent. Membrane-based separation processes ensure high permeate quality, but are prone to fouling when treating oily wastes. Surfactants play an important role in producing well-stabilized oil emulsions, but there has been limited work on the effect of surfactants on membrane fouling. To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF. |
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To fundamentally understand the surfactant effect on fouling, we studied the fouling of model oil (hexadecane) emulsions stabilized by anionic, cationic and nonionic surfactants in a crossflow filtration system using either ultrafiltration (UF) or nanofiltration (NF) membranes. For this, we investigated the impact of membrane surface and emulsion properties on the different fouling mechanisms observed in our experiments. UF filtration experiments revealed that emulsions stabilized with cationic surfactant quickly fouled negatively charged UF membranes due to electrostatic attraction, while anionic and non-ionic surfactants stabilized emulsions experienced less fouling. In NF filtration tests, membranes exhibited exponential fouling when filtrating all types of surfactant stabilized emulsions. Permeate quality confirms that the NF process achieves better rejection of surfactants than the UF process. However, cationic surfactants are able to pass through NF membranes because of their positive charge. When salt is added to the water, electrostatic forces collapse, and the differences between the surfactants are quenched. Our experimental results combined with theoretical calculations reveal that initial membrane fouling by emulsified oil drops is dominated by a cake layer formation. However, once a critical pressure drop across the cake layer is achieved, membrane wetting occurs, which results in irreversible membrane fouling in both UF and NF.</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Nanofiltration</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Ultrafiltration</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Membrane surface wetting</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Oil-water separation</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="650" ind1=" " ind2="7"><subfield code="a">Surfactant</subfield><subfield code="2">Elsevier</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Dudchenko, Alexander</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Gu, Xiaotian</subfield><subfield code="4">oth</subfield></datafield><datafield tag="700" ind1="1" ind2=" "><subfield code="a">Jassby, David</subfield><subfield code="4">oth</subfield></datafield><datafield tag="773" ind1="0" ind2="8"><subfield code="i">Enthalten in</subfield><subfield code="n">Elsevier</subfield><subfield code="a">Yue, Xin-Zheng ELSEVIER</subfield><subfield code="t">Steering charge kinetics in W</subfield><subfield code="d">2019</subfield><subfield code="d">the official journal of the North American Membrane Society</subfield><subfield code="g">New York, NY [u.a.]</subfield><subfield code="w">(DE-627)ELV002478420</subfield></datafield><datafield tag="773" ind1="1" ind2="8"><subfield code="g">volume:529</subfield><subfield code="g">year:2017</subfield><subfield code="g">day:1</subfield><subfield code="g">month:05</subfield><subfield code="g">pages:159-169</subfield><subfield code="g">extent:11</subfield></datafield><datafield tag="856" ind1="4" ind2="0"><subfield code="u">https://doi.org/10.1016/j.memsci.2017.02.004</subfield><subfield code="3">Volltext</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_USEFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">GBV_ELV</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SYSFLAG_U</subfield></datafield><datafield tag="912" ind1=" " ind2=" "><subfield code="a">SSG-OLC-PHA</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">35.17</subfield><subfield code="j">Katalyse</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">58.50</subfield><subfield code="j">Umwelttechnik: Allgemeines</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="936" ind1="b" ind2="k"><subfield code="a">43.12</subfield><subfield code="j">Umweltchemie</subfield><subfield code="q">VZ</subfield></datafield><datafield tag="951" ind1=" " ind2=" "><subfield code="a">AR</subfield></datafield><datafield tag="952" ind1=" " ind2=" "><subfield code="d">529</subfield><subfield code="j">2017</subfield><subfield code="b">1</subfield><subfield code="c">0501</subfield><subfield code="h">159-169</subfield><subfield code="g">11</subfield></datafield></record></collection>
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