Investigating and comparison the methods of manufacturing ion exchange resin wafers using sodium alginate as a natural polymer for utilization in the electrodeionization process
Paper ID : 1382-MST2015-FULL
Authors:
Alir Reza Heidari, Ahmad Moheb *
Isfahan University of Technology
Abstract:
Electrodeionization is a widely used technology for producing ultrapure water that combines the operation principles of both ion exchange and electrodialysis in a single unit. There are various applications that prove electrodeionization`s significance, such as in the nuclear, pharmaceutical, electronics and semiconductor parts, aerospace, laboratories, and chemical industries. Moreover, this process can be used for a wide variety of applications in low concentration and selective ion removal because of its better performance and economical operation. Accordingly, wafer Enhanced- Electrodeionization (WE-EDI) is an improved technology which immobilizes resins into wafers allowing for a significant expansion in applications due to a decrease in internal and external channeling and leakage.
Typical resin wafers have been exposed to reducing the contact surface of resin beads with solution and rate of ion exchange, which can be due to the use of polymers such as polyethylene as a binder substrate. As a result, the efficiency of the electrodeionization process remarkably reduces. The present study deals with the investigation and comparison of the methods of manufacturing ion exchange resin wafers using sodium alginate as a natural polymer for utilization in the electrodeionization process and evaluation of some characteristics, including physical properties, ease of manufacturing process, porosity, capacity, and permeability. Experimental data showed that by using sodium the resins efficiency in the electrodeionization process was enhanced significantly. This was due to highly hydrophilic nature of sodium alginate and therefore increased resin beads contact area with solution. The results were compared by the findings of other researchers which used hydrophobic polymers for making resin wafers.
Keywords:
Electrodeionization (EDI); Ion selective removal; Resin wafer; Sodium alginate.
Status : Paper Accepted (Poster Presentation)