Denitrification of ground water by electrodialysis using a new anion exchange membrane

Studies have been conducted to reduce nitrate in a Moroccan ground water by electrodialysis using a new nitrate permselective membrane. The initial total dissolved solids (TDS) was 814.3 ppm including 77 ppm of nitrate and 7.84 meq l⁻¹ of total hardness. The operation was carried out under different applied voltages. The results show that the desired product water quality can be obtained. Sulphate can be stopped in the diluate compartment, which minimized the possible precipitation of bivalent salts in the concentrate side. A control of the selectivity of the nitrate permselective membrane has been carried out. This study shows that electrodialysis is a simple process for reduction of nitrate in ground water.