Styrene-based gel or macroporous anion resins can be used to remove organics. However, only certain types of these resins can be used for successful operation.
An important characteristic of the resin is the moisture retention, as an anion resin with a high moisture content is structurally less dense. This means that the ions being exchanged have more room or water to move around in, which is beneficial for large molecules such as organic acids that are slow-moving because of their size. The moisture-to-capacity ratio is also important because it affects the regeneration efficiency. Surprisingly, a lower capacity resin is preferable because it gives a higher moisture-to-capacity ratio.
Other resins that can be used are acrylic-based. Acrylic-based anion resins are good candidates for organic removal because of their resistance to fouling. They are more hydrophilic than the gel resins, which means that they have a lower attraction to organics. They still remove organics very effectively, but release them more readily during regeneration.
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