Boron and salt ion transport in electrically assisted reverse osmosis
Herein, we report a novel electrically assisted reverse osmosis (EARO) process which integrates an electrochemical process with the conventional RO process. We systematically investigated the behaviors of boron and salt ion (i.e., Na+ and Cl−) transporting through a commercial seawater RO (SWRO) mem...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160374 |
| _version_ | 1826111770739081216 |
|---|---|
| author | Bao, Xian Long, Wei Liu, Hong She, Qianhong |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Bao, Xian Long, Wei Liu, Hong She, Qianhong |
| author_sort | Bao, Xian |
| collection | NTU |
| description | Herein, we report a novel electrically assisted reverse osmosis (EARO) process which integrates an electrochemical process with the conventional RO process. We systematically investigated the behaviors of boron and salt ion (i.e., Na+ and Cl−) transporting through a commercial seawater RO (SWRO) membrane in the EARO process under a range of applied voltages by employing an external porous carbon cloth as cathode on the SWRO membrane surface. The SWRO membrane in the EARO process exhibited a significantly enhanced boron rejection of 93.8% under the applied voltage of 4 V compared with the conventional RO process (~75.0%). The enhancement in boron removal efficiency in EARO is mainly attributed to the locally elevated pH near the RO membrane surface caused by water electrolysis. At elevated pH, boron transforms from the uncharged boric acid to negatively charged and sized-increased borate ion and is more favorably rejected by the SWRO membrane. On the other hand, the variation of salt ion rejection was marginal with increasing the applied voltages in EARO. This study demonstrates that the EARO has a great potential to achieve low-chemical and low-cost boron removal in one-pass RO seawater desalination. To make this process more practically feasible, the future efforts need to optimize the development of the electrically conductive feed spacer and the membrane module. |
| first_indexed | 2024-10-01T02:55:55Z |
| format | Journal Article |
| id | ntu-10356/160374 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:55:55Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1603742022-07-20T05:15:19Z Boron and salt ion transport in electrically assisted reverse osmosis Bao, Xian Long, Wei Liu, Hong She, Qianhong School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Singapore Membrane Technology Centre Engineering::Environmental engineering Electrically Assisted Reverse Osmosis Desalination Herein, we report a novel electrically assisted reverse osmosis (EARO) process which integrates an electrochemical process with the conventional RO process. We systematically investigated the behaviors of boron and salt ion (i.e., Na+ and Cl−) transporting through a commercial seawater RO (SWRO) membrane in the EARO process under a range of applied voltages by employing an external porous carbon cloth as cathode on the SWRO membrane surface. The SWRO membrane in the EARO process exhibited a significantly enhanced boron rejection of 93.8% under the applied voltage of 4 V compared with the conventional RO process (~75.0%). The enhancement in boron removal efficiency in EARO is mainly attributed to the locally elevated pH near the RO membrane surface caused by water electrolysis. At elevated pH, boron transforms from the uncharged boric acid to negatively charged and sized-increased borate ion and is more favorably rejected by the SWRO membrane. On the other hand, the variation of salt ion rejection was marginal with increasing the applied voltages in EARO. This study demonstrates that the EARO has a great potential to achieve low-chemical and low-cost boron removal in one-pass RO seawater desalination. To make this process more practically feasible, the future efforts need to optimize the development of the electrically conductive feed spacer and the membrane module. Ministry of Education (MOE) This research was supported by the Ministry of Education, Singapore, under the Academic Research Fund Tier 1 (RG84/19). 2022-07-20T05:15:18Z 2022-07-20T05:15:18Z 2021 Journal Article Bao, X., Long, W., Liu, H. & She, Q. (2021). Boron and salt ion transport in electrically assisted reverse osmosis. Journal of Membrane Science, 637, 119639-. https://dx.doi.org/10.1016/j.memsci.2021.119639 0376-7388 https://hdl.handle.net/10356/160374 10.1016/j.memsci.2021.119639 2-s2.0-85110272887 637 119639 en RG84/19 Journal of Membrane Science © 2021 Elsevier B.V. All rights reserved. |
| spellingShingle | Engineering::Environmental engineering Electrically Assisted Reverse Osmosis Desalination Bao, Xian Long, Wei Liu, Hong She, Qianhong Boron and salt ion transport in electrically assisted reverse osmosis |
| title | Boron and salt ion transport in electrically assisted reverse osmosis |
| title_full | Boron and salt ion transport in electrically assisted reverse osmosis |
| title_fullStr | Boron and salt ion transport in electrically assisted reverse osmosis |
| title_full_unstemmed | Boron and salt ion transport in electrically assisted reverse osmosis |
| title_short | Boron and salt ion transport in electrically assisted reverse osmosis |
| title_sort | boron and salt ion transport in electrically assisted reverse osmosis |
| topic | Engineering::Environmental engineering Electrically Assisted Reverse Osmosis Desalination |
| url | https://hdl.handle.net/10356/160374 |
| work_keys_str_mv | AT baoxian boronandsaltiontransportinelectricallyassistedreverseosmosis AT longwei boronandsaltiontransportinelectricallyassistedreverseosmosis AT liuhong boronandsaltiontransportinelectricallyassistedreverseosmosis AT sheqianhong boronandsaltiontransportinelectricallyassistedreverseosmosis |