Cation exchange


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Terms & Synonyms

Official WHO Definition

The interchange between cations in solution and cations on the surfaces of clay particles or organic colloids (WHO 2006).With respect to drinking water treatment, it is the process in which cation contaminants are removed from a liquid phase by contacting a synthetic, porous medium or resin that is coated with different cation species. The cations on the medium are exchanged for the cation contaminants. When the medium is depleted of the exchanging cations, it is regenerated with a concentrated solution to restore the bed with the exchanging cations and flush the contaminant cations for subsequent disposal (Symons et al. 2000).

Other Definitions


Interpretations and Explanations


Symons JM, Bradley LC Jr and Cleveland TC (2000) The Drinking Water Dictionary. American Water Works AssociationWHO (2006) Protecting groundwater for health

WHO Lexicon page (translations and examples)

See also

External Resources


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