The performance of three membrane processes (Donnan dialysis, electrod
ialysis, electrodeionization) using an ADS-Morgane anion-exchange memb
rane, was compared to remove nitrate from drinking water. The influenc
e of concentration, current density and flow rate was studied with a 3
.10(-3) M nitrate solution to determine the best experimental conditio
ns. Then the membrane processes were applied for the treatment of Mont
pellier drinking water where the nitrate concentration was increased u
p to a concentration of 80-100 ppm. In all cases the results showed ex
traction ratios higher than 80%. With the electrodialysis and electrod
eionization techniques, the extraction rate of nitrate was faster than
with Donnan dialysis, and a deionized water of high purity was obtain
ed. A nitrate elimination ratio of 99% has been reached with electrode
ionization.