Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes
Osmotically driven membrane processes, such as forward osmosis (FO) and pressure retarded osmosis (PRO), are attracting increasing interest in research and applications in environment and energy related fields. In this study, we systematically investigated the alginate fouling on an osmotic membrane...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2013
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| Online Access: | https://hdl.handle.net/10356/96184 http://hdl.handle.net/10220/10259 |
| _version_ | 1826110081516699648 |
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| author | She, Qianhong Jin, Xue Li, Qinghua Tang, Chuyang Y. |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering She, Qianhong Jin, Xue Li, Qinghua Tang, Chuyang Y. |
| author_sort | She, Qianhong |
| collection | NTU |
| description | Osmotically driven membrane processes, such as forward osmosis (FO) and pressure retarded osmosis (PRO), are attracting increasing interest in research and applications in environment and energy related fields. In this study, we systematically investigated the alginate fouling on an osmotic membrane during FO operation using four types of draw solutions (NaCl, MgCl2, CaCl2 and Ca(NO3)2) to elucidate the relationships between reverse (from draw solution to feed solution) and forward (from feed solution to draw solution) solute diffusion, and membrane fouling. At the same water flux level (achieved by adjusting the draw solution concentration), the greatest reverse solute diffusion rate was observed for NaCl draw solution, followed by Ca(NO3)2 draw solution, and then CaCl2 draw solution and MgCl2 draw solution, the order of which was consistent with that of their solute permeability coefficients. Moreover, the reverse solute diffusion of draw solute (especially divalent cation) can change the feed solution chemistry and thus enhance membrane fouling by alginate, the extent of which is related to the rate of the reverse draw solute diffusion and its ability to interact with the foulant. The extent of fouling for the four types of draw solution followed an order of Ca(NO3)2 > CaCl2 >> MgCl2 > NaCl. On the other hand, the rate of forward diffusion of feed solute (e.g., Na+) was in turn promoted under severe membrane fouling in active layer facing draw solution orientation, which may be attributed to the fouling enhanced concentration polarization (pore clogging enhanced ICP and cake enhanced concentration polarization). The enhanced concentration polarization can lead to additional water flux reduction and is an important mechanism governing the water flux behavior during FO membrane fouling. Findings have significant implications for the draw solution selection and membrane fouling control in osmotically driven membrane processes. |
| first_indexed | 2024-10-01T02:28:39Z |
| format | Journal Article |
| id | ntu-10356/96184 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:28:39Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | ntu-10356/961842020-03-07T11:43:39Z Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes She, Qianhong Jin, Xue Li, Qinghua Tang, Chuyang Y. School of Civil and Environmental Engineering Osmotically driven membrane processes, such as forward osmosis (FO) and pressure retarded osmosis (PRO), are attracting increasing interest in research and applications in environment and energy related fields. In this study, we systematically investigated the alginate fouling on an osmotic membrane during FO operation using four types of draw solutions (NaCl, MgCl2, CaCl2 and Ca(NO3)2) to elucidate the relationships between reverse (from draw solution to feed solution) and forward (from feed solution to draw solution) solute diffusion, and membrane fouling. At the same water flux level (achieved by adjusting the draw solution concentration), the greatest reverse solute diffusion rate was observed for NaCl draw solution, followed by Ca(NO3)2 draw solution, and then CaCl2 draw solution and MgCl2 draw solution, the order of which was consistent with that of their solute permeability coefficients. Moreover, the reverse solute diffusion of draw solute (especially divalent cation) can change the feed solution chemistry and thus enhance membrane fouling by alginate, the extent of which is related to the rate of the reverse draw solute diffusion and its ability to interact with the foulant. The extent of fouling for the four types of draw solution followed an order of Ca(NO3)2 > CaCl2 >> MgCl2 > NaCl. On the other hand, the rate of forward diffusion of feed solute (e.g., Na+) was in turn promoted under severe membrane fouling in active layer facing draw solution orientation, which may be attributed to the fouling enhanced concentration polarization (pore clogging enhanced ICP and cake enhanced concentration polarization). The enhanced concentration polarization can lead to additional water flux reduction and is an important mechanism governing the water flux behavior during FO membrane fouling. Findings have significant implications for the draw solution selection and membrane fouling control in osmotically driven membrane processes. 2013-06-12T06:23:40Z 2019-12-06T19:26:41Z 2013-06-12T06:23:40Z 2019-12-06T19:26:41Z 2012 2012 Journal Article She, Q., Jin, X., Li, Q., & Tang, C. Y. (2012). Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes. Water Research, 46(7), 2478-2486. 0043-1354 https://hdl.handle.net/10356/96184 http://hdl.handle.net/10220/10259 10.1016/j.watres.2012.02.024 en Water research © 2012 Elsevier Ltd. |
| spellingShingle | She, Qianhong Jin, Xue Li, Qinghua Tang, Chuyang Y. Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| title | Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| title_full | Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| title_fullStr | Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| title_full_unstemmed | Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| title_short | Relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| title_sort | relating reverse and forward solute diffusion to membrane fouling in osmotically driven membrane processes |
| url | https://hdl.handle.net/10356/96184 http://hdl.handle.net/10220/10259 |
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