Elimination of nitrate from drinking water by electrochemical membrane processes

• Published in: Desalination Vol. 101; no. 2; pp. 123 - 131
• Main Authors: Salem, Kheira, Sandeaux, Jacqueline, Molénat, Jean, Sandeaux, Roger, Gavach, Claude
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 1995; Elsevier
• Subjects: Applied sciences; Donnan dialysis; Drinking water; Drinking water and swimming-pool water. Desalination; Electrodeionization; Electrodialysis; Exact sciences and technology; Ion-exchange membrane; Nitrate; Nitrates; Pollution; Q1; Water treatment and pollution; Ion-exchange membrane; Donnan dialysis; Drinking water; Electrodeionization; Nitrate; Electrodialysis; Performance evaluation; Drinking water treatment; Anion exchange; Concentration effect; Elimination; Membrane; Nitrates; Comparative study
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/0011-9164(95)00015-T

The performance of three membrane processes (Donnan dialysis, electrodialysis, electrodeionization) using an ADS-Morgane anion-exchange membrane, was compared to remove nitrate from drinking water. The influence of concentration, current density and flow rate was studied with a 3.10 −3 M nitrate solution to determine the best experimental conditions. Then the membrane processes were applied for the treatment of Montpellier drinking water where the nitrate concentration was increased up to a concentration of 80–100 ppm. In all cases the results showed extraction ratios higher than 80%. With the electrodialysis and electrodeionization techniques, the extraction rate of nitrate was faster than with Donnan dialysis, and a deionized water of high purity was obtained. A nitrate elimination ratio of 99% has been reached with electrodeionization.