Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations
Submerged forward osmosis (FO) is of high interest for bioreactors, such as osmotic membrane bioreactor, microalgae photobioreactor, food or bioproduct concentration where pumping through pressurized modules is a limitation due to viscosity or breakage of fragile components. However, so far, most FO...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-09-01
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| Series: | Membranes |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2077-0375/8/3/72 |
| _version_ | 1797714269187342336 |
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| author | Gaetan Blandin Ignasi Rodriguez-Roda Joaquim Comas |
| author_facet | Gaetan Blandin Ignasi Rodriguez-Roda Joaquim Comas |
| author_sort | Gaetan Blandin |
| collection | DOAJ |
| description | Submerged forward osmosis (FO) is of high interest for bioreactors, such as osmotic membrane bioreactor, microalgae photobioreactor, food or bioproduct concentration where pumping through pressurized modules is a limitation due to viscosity or breakage of fragile components. However, so far, most FO efforts have been put towards cross flow configurations. This study provides, for the first time, insights on mass transfer limitations in the operation of submerged osmotic systems and offer recommendations for optimized design and operation. It is demonstrated that operation of the submerged plate and frame FO module requires draw circulation in the vacuum mode (vacuum assisted osmosis) that is in favor of the permeation flux. However, high pressure drops and dead zones occurring in classical U-shape FO draw channel strongly disadvantage this design; straight channel design proves to be more effective. External concentration polarization (ECP) is also a crucial element in the submerged FO process since mixing of the feed solution is not as optimized as in the cross flow module unless applying intense stirring. Among the mitigation techniques tested, air scouring proves to be more efficient than feed solution circulation. However, ECP mitigation methodology has to be adapted to application specificities with regards to combined/synergetic effects with fouling mitigation. |
| first_indexed | 2024-03-12T07:49:25Z |
| format | Article |
| id | doaj.art-fab1d65b4ced4306a3784ed81db81c36 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-12T07:49:25Z |
| publishDate | 2018-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-fab1d65b4ced4306a3784ed81db81c362023-09-02T20:45:23ZengMDPI AGMembranes2077-03752018-09-01837210.3390/membranes8030072membranes8030072Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer LimitationsGaetan Blandin0Ignasi Rodriguez-Roda1Joaquim Comas2Laboratory of Chemical and Environmental Engineering (LEQUIA), Institute of the Environment, University of Girona, 17003 Girona, SpainLaboratory of Chemical and Environmental Engineering (LEQUIA), Institute of the Environment, University of Girona, 17003 Girona, SpainLaboratory of Chemical and Environmental Engineering (LEQUIA), Institute of the Environment, University of Girona, 17003 Girona, SpainSubmerged forward osmosis (FO) is of high interest for bioreactors, such as osmotic membrane bioreactor, microalgae photobioreactor, food or bioproduct concentration where pumping through pressurized modules is a limitation due to viscosity or breakage of fragile components. However, so far, most FO efforts have been put towards cross flow configurations. This study provides, for the first time, insights on mass transfer limitations in the operation of submerged osmotic systems and offer recommendations for optimized design and operation. It is demonstrated that operation of the submerged plate and frame FO module requires draw circulation in the vacuum mode (vacuum assisted osmosis) that is in favor of the permeation flux. However, high pressure drops and dead zones occurring in classical U-shape FO draw channel strongly disadvantage this design; straight channel design proves to be more effective. External concentration polarization (ECP) is also a crucial element in the submerged FO process since mixing of the feed solution is not as optimized as in the cross flow module unless applying intense stirring. Among the mitigation techniques tested, air scouring proves to be more efficient than feed solution circulation. However, ECP mitigation methodology has to be adapted to application specificities with regards to combined/synergetic effects with fouling mitigation.http://www.mdpi.com/2077-0375/8/3/72membrane bioreactorforward osmosiswater reusesubmerged membraneconcentration polarizationmodule designvacuum assisted osmosis |
| spellingShingle | Gaetan Blandin Ignasi Rodriguez-Roda Joaquim Comas Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations Membranes membrane bioreactor forward osmosis water reuse submerged membrane concentration polarization module design vacuum assisted osmosis |
| title | Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations |
| title_full | Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations |
| title_fullStr | Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations |
| title_full_unstemmed | Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations |
| title_short | Submerged Osmotic Processes: Design and Operation to Mitigate Mass Transfer Limitations |
| title_sort | submerged osmotic processes design and operation to mitigate mass transfer limitations |
| topic | membrane bioreactor forward osmosis water reuse submerged membrane concentration polarization module design vacuum assisted osmosis |
| url | http://www.mdpi.com/2077-0375/8/3/72 |
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