Now experiments are being performed using better acid blocker anion exchange membranes and also by applying base blocking cation exchange membranes. (Quelle: bmb+f Forschungslandkarte Deutschland 1998)
The membrane combination: conventional ED cation exchange membrane - a moderate acid blocking anion exchange membrane - bipolar membrane, showed the following results (table 4): (Quelle: bmb+f Forschungslandkarte Deutschland 1998)
In the total desalination stage (combination of strong cation exchanger, strong anion exchanger and mixed bed) it was possible to achieve a product water quality of 0.055 µS/cm, within a long working period of the ion exchanger. (Quelle: bmb+f Forschungslandkarte Deutschland 1998)