Highly effective electrodialysis for selective elimination of nitrates from drinking water

This paper considers a new and highly effective process for selective elimination of nitrates from drinking water through electrodialysis. It is based on coupled use of a modified anion exchange membrane with a nitrate-selective anion exchange resin. The latter is placed in the desalination compartment and constitutes a part of a new type of ion-conducting intermembrane spacer. A highly preferential transport of nitrate anions against chlorides and sulphates is observed to take place at low current densities. The results obtained prove that electrodialysis is a practical solution to the problem of selective elimination of nitrates from drinking water.