Abstract
Frontal analysis was used to study the removal of soluble SiO 2 from water by strong-base, or mixed functionality, anion-exchange resins. It was found that if the total concentration of the anions in the influent water exceeds values corresponding to the solubility of SiO 2 (of the order of 2 meq/l under the conditions of this work), then part of the SiO 2 retained by the resin is found in the non-ionic form. This phenomenon is amplified by high SiO 2 content and is reduced in the presence of HCO 3 − ions. Mixed functionality acrylic resins show this phenomenon to a lesser extent. Regeneration of non-ionic silica becomes a solubilization phenomenon rather than ion exchange. Implications on co- and counter-current regeneration are discussed.
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