Abstract— This paper aims to examine the treatment of aluminum fluoride-manufacturing wastewaters (AFMW) by adsorption on Tunisian natural clay using a two-level full factorial design. For this sake, three operating parameters supposed to affect the removal efficiency were chosen: dose of adsorbent, concentration of fluoride ions, and pH of the medium. Factors that influence the fluoride removal efficiency were evaluated statistically by using factorial plots. Diagram of the effects was used to check the significance of the effect on percentage removal. The statistical analysis allowed verifying that the dose of adsorbent and pH have an influence on the fluoride elimination. Treatment of a strongly acidic (pH ~ 2) and fluoride-rich AFMW (F=26,000 mg/L) by adsorption on natural clay was used to determine the optimum conditions. The application of this method has led to an important decrease in fluorine content (> 98%).
Keywords—Adsorption, Aluminum fluoride-manufacturing, Design of Experiment, Fluoride, Industrial wastewater, Natural clay.
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