Water Supply Vol 2 No 1 pp 57–62 © IWA Publishing 2002
Partial demineralisation of drinking water using carbon dioxide regenerated ion exchangers
W.H. Höll* and K. Hagen**
*Forschungszentrum Karlsruhe, Institute for Technical Chemistry, Section WGT, P.O. Box 3640, D-76021 Karlsruhe, Germany
**VA TECH-WABAG GmbH, Kulmbach, P.O. Box 2049, D-95312 Kulmbach, Germany
ABSTRACT
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.
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