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New ceramic cedi-system

Developing a novel ceramic filter element for continuous
electro deionisation (cedi) and to develop a new cedi-system
for purification of water, utilising this ceramic element,
intended for operations at high temperature and pressure.

Continuous electrodeionization (CEDI) is a method for removing charged ions from liquid (process and/or waste) streams, which is based upon a combination of electrodialysis (ED) and conventional ion-exchange (IX). Due to the high resistivity of dilute solutions and because of polarisation phenomena (limiting current densities) ED becomes uneconomical at low concentrations. In order to overcome this problem, ion-exchange materials can be introduced into the depleting chambers of an ED-stack. This will significantly reduce the stack resistance due to the high conductivity of the ion-exchanger compared with that of the solution to be treated. Commercial CEDI-systems today apply either mixed-bed ion-exchangers or single-bed ion-exchangers together with membranes of organic nature, and therefore operate at temperatures lower than 50-70°C. The new ceramic CEDI filters do in one rigid structure combine the function of several elements of the CEDI-system: i) the ion-exchanger, ii) the enclosure (package) of the ion-exchanger, and iii) the caption- and/or anion-membrane. KERANOR AS and SG WASSERAUFBEREITUNG UND REGENERIERSTATION GMBH are developing a new CEDI-system utilising the new ceramic filter element. KERANOR will in this project develop, optimise and tailor the ceramic filter element for the modified CEDI-system that SG WASSERAUFBEREITUNG will develop, test and qualify.
Acronym: 
CERAM-CEDI
Project ID: 
2 768
Start date: 
01-01-2002
Project Duration: 
60months
Project costs: 
2 330 000.00€
Technological Area: 
Membrane / Filtration technology
Market Area: 

Raising the productivity and competitiveness of European businesses through technology. Boosting national economies on the international market, and strengthening the basis for sustainable prosperity and employment.