Cationic selectrodialysis for magnesium recovery from seawater on lab and pilot scale
Ghyselbrecht, K.; Sansen, B.; Monballiu, A.; Ye, Z.-L.; Pinoy, L.; Meesschaert, B. (2019). Cationic selectrodialysis for magnesium recovery from seawater on lab and pilot scale. Separation and Purification Technology 221: 12-22. https://dx.doi.org/10.1016/j.seppur.2019.03.079
In: Separation and Purification Technology. ELSEVIER SCIENCE BV: Amsterdam. ISSN 1383-5866; e-ISSN 1873-3794, more
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| Author keywords |
Fractionation; Magnesium; Seawater; Selectrodialysis |
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- Ye, Z.-L., more
- Pinoy, L.
- Meesschaert, B., more
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| Abstract |
In view of its multiple applications the selective recovery of Mg2+ from seawater can be very interesting. For this purpose, cationic selectrodialysis (cSED), which uses a conventional electrodialysis stack that is supplementary equipped with monovalent selective cation-exchange membranes, was used. Initially, various parameters were investigated on lab scale using synthetic seawater. The results pointed out that a lower current density resulted in a higher Mg2+ concentration in the product. A higher unwanted Mg2+ concentration was obtained in the brine when the initial concentration of NaCl in the product was lowered. Subsequently, it was demonstrated that the treatment of real North Sea water with cSED was technologically feasible during a short-term batch experiment on lab scale. In a next phase, a cSED pilot plant was operated in a stable way in a long-term feed and bleed experiment in which the Mg2+ content of the North Sea water that was used as initial product was at least doubled. However, the Ca2+ concentration in the product also increased. This might reduce the applicability of the recovered product. From this research it is concluded that cSED is a promising and attractive technology to recover Mg2+ from seawater. |
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