Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal
This study aims to evaluate the application of ceramic ultrafiltration membranes in the crossflow mode for the separation of particles and oil in water emulsions (free oil droplets and micelles) from hydrothermal-liquefaction wastewater (HTL-WW) from the hydrothermal liquefaction of municipal sewage...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/12/3/255 |
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| author | Ali Sayegh Simon Merkert Joscha Zimmermann Harald Horn Florencia Saravia |
| author_facet | Ali Sayegh Simon Merkert Joscha Zimmermann Harald Horn Florencia Saravia |
| author_sort | Ali Sayegh |
| collection | DOAJ |
| description | This study aims to evaluate the application of ceramic ultrafiltration membranes in the crossflow mode for the separation of particles and oil in water emulsions (free oil droplets and micelles) from hydrothermal-liquefaction wastewater (HTL-WW) from the hydrothermal liquefaction of municipal sewage sludge. The experiments were carried out using one-channel TiO<sub>2</sub> membranes with pore sizes of 30, 10 and 5 nm. The results showed that the highest stable permeability could be achieved with a membrane-pore size of 10 nm, which experienced less fouling, especially through pore blockage, in comparison to the two other pore sizes. Instead of observing an increase in the permeability, the application of a higher feed temperature as well as backwash cycles led to a clear increase in irreversible fouling due to the presence of surfactants in the HTL-WW. Among several physical and chemical cleaning methods, alkaline cleaning at pH 12 proved to be the most efficient in removing fouling and maintaining stable performance on a long-term basis. Ceramic-membrane ultrafiltration can be considered as an adequate first-stage treatment of real HTL wastewater. |
| first_indexed | 2024-03-09T13:22:42Z |
| format | Article |
| id | doaj.art-bd3da634234a46bf9eccbe7e1d038c25 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-09T13:22:42Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-bd3da634234a46bf9eccbe7e1d038c252023-11-30T21:27:49ZengMDPI AGMembranes2077-03752022-02-0112325510.3390/membranes12030255Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle RemovalAli Sayegh0Simon Merkert1Joscha Zimmermann2Harald Horn3Florencia Saravia4Engler-Bunte-Institut, Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, GermanyEngler-Bunte-Institut, Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, GermanyInstitute of Catalysis Research and Technology, Karlsruhe Institute of Technology, Hermann-Von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, GermanyEngler-Bunte-Institut, Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, GermanyDVGW-Research Center at the Engler-Bunte-Institut, Water Chemistry and Water Technology, Karlsruhe Institute of Technology, Engler-Bunte-Ring 9, 76131 Karlsruhe, GermanyThis study aims to evaluate the application of ceramic ultrafiltration membranes in the crossflow mode for the separation of particles and oil in water emulsions (free oil droplets and micelles) from hydrothermal-liquefaction wastewater (HTL-WW) from the hydrothermal liquefaction of municipal sewage sludge. The experiments were carried out using one-channel TiO<sub>2</sub> membranes with pore sizes of 30, 10 and 5 nm. The results showed that the highest stable permeability could be achieved with a membrane-pore size of 10 nm, which experienced less fouling, especially through pore blockage, in comparison to the two other pore sizes. Instead of observing an increase in the permeability, the application of a higher feed temperature as well as backwash cycles led to a clear increase in irreversible fouling due to the presence of surfactants in the HTL-WW. Among several physical and chemical cleaning methods, alkaline cleaning at pH 12 proved to be the most efficient in removing fouling and maintaining stable performance on a long-term basis. Ceramic-membrane ultrafiltration can be considered as an adequate first-stage treatment of real HTL wastewater.https://www.mdpi.com/2077-0375/12/3/255hydrothermal-liquefaction wastewatercrossflow ultrafiltrationceramic membranesoil and particle removal |
| spellingShingle | Ali Sayegh Simon Merkert Joscha Zimmermann Harald Horn Florencia Saravia Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal Membranes hydrothermal-liquefaction wastewater crossflow ultrafiltration ceramic membranes oil and particle removal |
| title | Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal |
| title_full | Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal |
| title_fullStr | Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal |
| title_full_unstemmed | Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal |
| title_short | Treatment of Hydrothermal-Liquefaction Wastewater with Crossflow UF for Oil and Particle Removal |
| title_sort | treatment of hydrothermal liquefaction wastewater with crossflow uf for oil and particle removal |
| topic | hydrothermal-liquefaction wastewater crossflow ultrafiltration ceramic membranes oil and particle removal |
| url | https://www.mdpi.com/2077-0375/12/3/255 |
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