Déminéralisation des eaux saumâtres du sud Tunisien par électrodialyse ou par osmose inverse
Written by sctunisie no commentsThe contribution of membrane techniques with the aim of producing potable water from brackish water without using chemical reactants has become a reality e.g. the supply of the towns of Gabes and Zarzis (south of Tunisia). The utilization of selective membranes CMX/ACS (selective to monovalent ions) allows one to reduce the contents of monovalent ions ( Na+ and Cl- which are responsible for the salinity of water) while reducing only slightly the contents of divalent ions. Experiment shows that low mobility of divalent ions in the membrane phase plays a determining role in ion extraction. A pilot equipped with a filmTec RO membrane (Nanomax 95) alimented with brackish water collected from Zarzis town was operated at 15 bars, 25°C, and up to a water recovery ratio of 50%. The results showed that the RO is actually efficient since it highly reduced the content of inorganic matter present in raw waters (rejection > 95% for the divalent ions and 85% for the monovalent ones ).
K. Walha, R. Ben Amar, F. Quemeneur, P. Jaouen
Brackish water, Desalination, Potable water, reverse Osmosis, Electrodialysis
Pages 133-142
