Anthropogenic activities such as fertilizer, aluminum, steel, ceramics, bricks, and glass industries, and nuclear applications, play an important role in water resource pollution by fluoride(F). Several studies focused on defluoridation methods of such industrial wastewaters. Adsorption technique is one of the most favorable of all the defluoridation techniques, specially when it performed by using low cost and locally available materials. Defluoridation of aqueous solutions using waste aluminum filings as adsorbent was studied in batch experiments. Influence of various experimental parameters such as, pH(2-12), adsorbent dose(1-20 gr/l), contact time(15-60 min), interfering anions(200 and 400mg/l), adsorbent activation temperature(500-900°C), adsorption temperature(20-50°C) and initial F concentration(5-20 mg/l) were studied. The removal efficiencies increased with the increased in contact time, adsorbent dose, adsorbent activation temperature, pH, adsorption temperature and decreasing initial F concentration. The removal of F with interfering anions, reduced in the following order PO₄³⁻> HCO₃^-> CO₃²⁻> Cl⁻> SO₄²⁻≥ NO₃⁻. The adsorption was found to be endothermic and was better fitted for the Fraundlich model which was indicative of multilayer adsorption.

Present study demonstrated the practical feasibility of aluminum filings as an available, cheap and effective adsorbent in defluoridation from aqueous solutions. Because aluminum filings could be used in column adsorption systems, its applicability in treatment facilities seem to be more feasible than aluminium base coagulant.

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