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A novel corrugated wall channel module for external concentration polarization mitigation in forward osmosis process.
- Source :
- Environmental Science & Pollution Research; Nov2018, Vol. 25 Issue 32, p32791-32801, 11p
- Publication Year :
- 2018
-
Abstract
- Much work has been conducted on the topic of forward osmosis (FO), but only a few studies have focused on mitigating external concentration polarization (ECP). This study introduced a simple structure, the corrugated wall channel, to the design of FO module, to induce vortex, and then mitigate ECP. In this study, the corrugated wall channel module (CWCM) was tested under given conditions, with a traditional flat membrane module (FMM) as control. CWCM could mitigate ECP and then enhance water flux. When deionized water was taken as feed solution (FS) and 2-M NaCl solution as draw solution (DS), the water flux enhancement was 16.49 and 18.51% in FO mode (active layer facing FS) and PRO mode (active layer facing DS), respectively. When 0.5-M NaCl solution was taken as FS, the corresponding values were 15.92 and 17.13%, respectively. Computational fluid dynamics (CFD) analysis showed that the CWCM could induce vortex, promote the mixing of the solution in the module, and further contribute to the increase of water flux. The specific shape of CWCM affected its performance on mitigating ECP. Also, the more tortuous CWCM exhibited higher water flux. In addition, CWCM could lessen membrane fouling. [ABSTRACT FROM AUTHOR]
- Subjects :
- OSMOSIS
MEMBRANE filter fouling
COMPUTATIONAL fluid dynamics
VORTEX motion
FOULING
Subjects
Details
- Language :
- English
- ISSN :
- 09441344
- Volume :
- 25
- Issue :
- 32
- Database :
- Complementary Index
- Journal :
- Environmental Science & Pollution Research
- Publication Type :
- Academic Journal
- Accession number :
- 132695258
- Full Text :
- https://doi.org/10.1007/s11356-018-3233-2