Defluoridation of Youssoufia-Morocco-Mine Fluoride-Contaminated Water by Adsorption on the Fly Ash in Static and Dynamic Reactor

In this study, we are interested in the elimination of fluoride ions in a batch and dynamic reactor by adsorption on fly ash from the Jorf-Lasfar thermal power plant in El Jadida, Morocco. Indeed, the results obtained showed that the fly ash made it possible to have treated water meeting international standards for fluorides, and for certain metals such as Pb and Fe, they will undergo a combined treatment. The elimination efficiency increases with the mass of the adsorbent, the stirring speed, with the pH values in a basic medium (7 < pH < 9.5) and this for a treatment at room temperature. Additionally, it was concluded that fly ash can be used for fluoride removal in waters with high fluoride concentrations. The results obtained in a dynamic reactor have shown that a fluoride elimination percentage of 97% can be reached under the optimal conditions of our experiment. According to its encouraging results by the simplicity proper to the work, by the reasonable cost of the works and the equipment, and by the good efficiency of elimination, it can be foreseen that the fly ash can be used as a filterable adsorbent in the field of water defluoridation.