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Elimination of nitrate from drinking water by electrochemical membrane processes

✍ Scribed by Kheira Salem; Jacqueline Sandeaux; Jean Molénat; Roger Sandeaux; Claude Gavach

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
468 KB
Volume
101
Category
Article
ISSN
0011-9164

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✦ Synopsis

The performance of three membr~e 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.

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