Al-Amshawee, Sajjad Khudhur Abbas and Mohd Yusri, Mohd Yunus and Dakhil, Ihsan Habib (2023) Ion exchange membrane electrodialysis for water and wastewater processing: Application of ladder type membrane spacers to impact solution concentration and fow dynamics. Environmental Science and Pollution Research. pp. 1-22. ISSN 1614-7499. (In Press / Online First) (In Press / Online First)
![[img]](http://umpir.ump.edu.my/style/images/fileicons/other.png) |
Pdf
ladder‑type membrane spacers.pdf Restricted to Repository staff only Download (2MB) | Request a copy |
|
|
Pdf
Ion exchange membrane electrodialysis for water and wastewater processing.pdf Download (310kB) | Preview |
Abstract
Concentration polarization, which creates a thin boundary layer along the membranes in electrochemical reactors and electrodialysis-related processes, is one of the main issues. Membrane spacers provide swirling motion in the stream and distribute fuid toward the membrane, which efectively breaks the polarization layer and maximizes fux steadily. Membrane spacers and the spacer-bulk attack angle are reviewed systematically in the current study. The study then in-depth reviews a ladder-type confguration composed of longitudinal (0° attack angle) and transverse (90° attack angle) flaments, and its efects on solution fow direction and hydrodynamics. The review discovered that, at the tradeof of high-pressure losses, a laddered spacer can provide mass transfer and mixing activity along the channel while preserving comparable patterns of concentration near the membrane wall. Pressure losses are driven by a change in the direction of velocity vectors. Dead spots in the spacer design that are created by the large contribution of the spacer manifolds can be reduced using the high-pressure drop. Laddered spacers also permit long, tortuous fow paths, which help to create turbulent fow and prevent concentration polarization. The absence of spacers produces limited mixing and broad polarization efects. A major portion of streamlines changes direction at ladder spacer strands positioned transverse to the main fow by moving in a zigzag manner up and down the flaments of the spacer. Flow at 90° is perpendicular to the transverse wires in x-coordinate, no change in y-coordinate.
| Item Type: | Article |
|---|---|
| Additional Information: | Indexed by Scopus |
| Uncontrolled Keywords: | Boundary layer; Bulk-spacer attack angle; Concentration polarization; Electrodialysis membrane desalination; Hydraulic retention time; Hydrodynamics; Ladder-type configuration; Mass transfer; Membrane spacers; Pressure drop |
| Subjects: | T Technology > TP Chemical technology |
| Faculty/Division: | Centre for Sustainability of Ecosystem & Earth Resources (Earth Centre) Institute of Postgraduate Studies Faculty of Chemical and Process Engineering Technology |
| Depositing User: | Ms. Nurul Ain Ismail |
| Date Deposited: | 11 Jan 2024 06:28 |
| Last Modified: | 11 Jan 2024 06:28 |
| URI: | http://umpir.ump.edu.my/id/eprint/39963 |
| Download Statistic: | View Download Statistics |
Actions (login required)
 |
View Item |