Restricted membrane electrochemical reactor and its applications in water hardness removal
Electrochemical descaling technology is focused by many researchers because of its convenient to use and environmental compatibility. However, the problems of serious backmixing and low current efficiency limit its applications. In this work, a novel restricted membrane (RM) electrochemical descalin...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | Desalination and Water Treatment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398624204938 |
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| author | Jiannan Xu Yao Li Lan Wang Wenlong Zhang Longyao Wang |
| author_facet | Jiannan Xu Yao Li Lan Wang Wenlong Zhang Longyao Wang |
| author_sort | Jiannan Xu |
| collection | DOAJ |
| description | Electrochemical descaling technology is focused by many researchers because of its convenient to use and environmental compatibility. However, the problems of serious backmixing and low current efficiency limit its applications. In this work, a novel restricted membrane (RM) electrochemical descaling reactor are constructed, and the descaling process is improved by stewing cathode discharge. When the membrane porosity decreased from 100 % to 42 %, the current efficiency increased from 11.7 % to 23.1 %. Under all current densities, the current efficiency of the processes < 30 % without stewing. After stewing cathode discharge (15 min), the current efficiency of the processes > 30 %. Furthermore, the current efficiency significantly increased from 20 %∼22 % (hydraulic retention time (HRT) 32 s) to 35∼40 % (HRT 8 s) after stewing 15 min. Prolonging HRT leads to a generalized high pH in the cathode side region. In this case, calcium carbonate will crystallize in solution rather than on the cathode surface. The microstructural characterization of the scale show that the scale precipitated on the cathode surface is ellipsoidal, while the scale obtained by stewing is typical calcite morphology. |
| format | Article |
| id | doaj-art-d776ab1041b346ea836ffaa452075510 |
| institution | DOAJ |
| issn | 1944-3986 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Desalination and Water Treatment |
| spelling | doaj-art-d776ab1041b346ea836ffaa4520755102025-08-20T03:04:46ZengElsevierDesalination and Water Treatment1944-39862025-01-0132110098310.1016/j.dwt.2024.100983Restricted membrane electrochemical reactor and its applications in water hardness removalJiannan Xu0Yao Li1Lan Wang2Wenlong Zhang3Longyao Wang4School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, ChinaSchool of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, ChinaSchool of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, ChinaSchool of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, ChinaCorresponding author.; School of Petrochemical Engineering, Changzhou University, Changzhou, Jiangsu 213164, ChinaElectrochemical descaling technology is focused by many researchers because of its convenient to use and environmental compatibility. However, the problems of serious backmixing and low current efficiency limit its applications. In this work, a novel restricted membrane (RM) electrochemical descaling reactor are constructed, and the descaling process is improved by stewing cathode discharge. When the membrane porosity decreased from 100 % to 42 %, the current efficiency increased from 11.7 % to 23.1 %. Under all current densities, the current efficiency of the processes < 30 % without stewing. After stewing cathode discharge (15 min), the current efficiency of the processes > 30 %. Furthermore, the current efficiency significantly increased from 20 %∼22 % (hydraulic retention time (HRT) 32 s) to 35∼40 % (HRT 8 s) after stewing 15 min. Prolonging HRT leads to a generalized high pH in the cathode side region. In this case, calcium carbonate will crystallize in solution rather than on the cathode surface. The microstructural characterization of the scale show that the scale precipitated on the cathode surface is ellipsoidal, while the scale obtained by stewing is typical calcite morphology.http://www.sciencedirect.com/science/article/pii/S1944398624204938Electrochemical descalingRestricted membraneStewing cathode dischargeCurrent efficiency |
| spellingShingle | Jiannan Xu Yao Li Lan Wang Wenlong Zhang Longyao Wang Restricted membrane electrochemical reactor and its applications in water hardness removal Desalination and Water Treatment Electrochemical descaling Restricted membrane Stewing cathode discharge Current efficiency |
| title | Restricted membrane electrochemical reactor and its applications in water hardness removal |
| title_full | Restricted membrane electrochemical reactor and its applications in water hardness removal |
| title_fullStr | Restricted membrane electrochemical reactor and its applications in water hardness removal |
| title_full_unstemmed | Restricted membrane electrochemical reactor and its applications in water hardness removal |
| title_short | Restricted membrane electrochemical reactor and its applications in water hardness removal |
| title_sort | restricted membrane electrochemical reactor and its applications in water hardness removal |
| topic | Electrochemical descaling Restricted membrane Stewing cathode discharge Current efficiency |
| url | http://www.sciencedirect.com/science/article/pii/S1944398624204938 |
| work_keys_str_mv | AT jiannanxu restrictedmembraneelectrochemicalreactoranditsapplicationsinwaterhardnessremoval AT yaoli restrictedmembraneelectrochemicalreactoranditsapplicationsinwaterhardnessremoval AT lanwang restrictedmembraneelectrochemicalreactoranditsapplicationsinwaterhardnessremoval AT wenlongzhang restrictedmembraneelectrochemicalreactoranditsapplicationsinwaterhardnessremoval AT longyaowang restrictedmembraneelectrochemicalreactoranditsapplicationsinwaterhardnessremoval |