CARIX is an ion exchange process which usually applies a mixed bed consisting of a weakly acidic and a strongly basic exchanger material. Carbon dioxide is applied as the only chemical for regeneration of the exchangers. As a consequence, the effluent contains only the amount of salt eliminated during the service cycle. CARIX allows a combined partial softening/dealkalisation/sulfate/nitrate of drinking water. A modification of the process uses exclusively a weakly acidic cation exchanger and allows a softening/dealkalisation. The process has been realised for drinking water treatment in five full-scale plants in Germany. Results of operation demonstrate that an excellent water quality is provided at fairly low cost.
Partial demineralisation of drinking water using carbon dioxide regenerated ion exchangers
W.H. Höll, K. Hagen; Partial demineralisation of drinking water using carbon dioxide regenerated ion exchangers. Water Science and Technology: Water Supply 1 January 2002; 2 (1): 57–62. doi: https://doi.org/10.2166/ws.2002.0007
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