revised_Application technology partial desalination in the Water utilities sector

Carix - regeneration of ion exchangers with carbonic acid

CO2 improves regeneration treatment


To regenerate the ion exchangers, CO2-saturated water is prepared and pumped through the filter beds. CO2 dissolved in water partially reacts to bicarbonate (HCO3-) and protons (H+). The free protons regenerate the cation exchanger, the hydrogen carbonate the anion exchanger. The residual CO2 is degassed from the rinse water process and used again for preparation of CO2-saturated water.   



  • Simultaneous lowering of hardness, sulphate, chloride and nitrate content in one step to result in favourable drinking water values
  • The regeneration only requires carbon dioxide and no additional salts
  • Favourable for the corrosion index (Larson index), since not only bicarbonates but also sulphates and chlorides are reduced.
  • Low CO2-consumption and operating costs


For the rapid and complete dissolution of CO2, Messer supplies several widely tested technologies, varying from fine-bubble feed directly into the main water stream to complete dissolution in a side stream under hydraulically defined conditions. In a project we specify the feed method that fits the customer needs regarding local conditions best.

revised_Customer process partial desalination in the Water utilities sector

Regeneration of ion exchangers

Providing carbonate for the anion exchanger

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