Defluoridation of underground water by adsorption on the chitosan and by electrodialysis

We studied the elimination of fluorides from underground water by adsorption on chitosan followed by e lectrodialysis with the help of the CMX-ACS membranes, After determining the optimal conditions of the defluorudation of a synthetic water by the chitosan extract from the chitin of the pink shrimps, we applied it to underground water of the city of Youssoufia. Another application has been made by electrodialysis of which the optimal conditions of treatment have been pre-established. A comparison of the two processes is also given. Keywords: Fluorides; Adsorption; Chitosan; Chitin; Electrodialysis; Defluoridation; Underground water *Corresponding author. Presented at the EuroMed 2004 conference on Desalination Strategies in South Mediterranean Countries: Cooperation between Mediterranean Countries of Europe and the Southern Rim of the Mediterranean. Sponsored by the European Desalination Society and Office National de l'Eau Potable, Marrakech, Morocco, 30 May-2 June, 2004. 0011-9164/04/$- See front matter © 2004 Elsevier B.V. All rights reserved doi;10.1016/j.desal.2004.06.049