Capacitive deionization (CDI) is most known for its low cost and efficiency compared to other desalination technologies but has a downgrade in desalinating water when dealing with solutions with a TDS higher than 15,000 ppm as its pores start filling out with no space for other ions to be stored, so increasing the surface area should increase its pores size as well but what I am asking is about the technical reason itself why can't it desalinate higher TDS in addition to why is it not already done in real desalination plants.
There is some useful information here Ahmed
https://www.sciencedirect.com/topics/engineering/capacitive-deionization
Hi Ahmed,
CDI, just like every other electrochemical/membrane based methods, is driven by ions transport. My thought is that if you have a higher concentration of salt in your feed solution than your rinse solution (recirculated on the electrode), you cannot accommodate much Na+ ions in your EDL after potential is applied. This can negatively impact your CDI performance.
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