Fluoride Removal



Abstract: Fluoridesorb (FS), a filter media consisting of Fe(O)OH, was investigated for removal of fluoride ion (F) from water. Adsorption was studied in batch experiments at room temperature together with the effect of contact time, pH, initial F concentration, and SO42- and Cl- as interfering anions. Lower pH with higher initial F concentration and longer contact time increased the F removal efficiency. In the absence of interfering anions, maximum removal of F approaching 98 percent was achieved at pH 6 after 30 min from water containing 7 mg F/L. Considering economic and feasibility aspects, adsorption of F with FS is recommended as a successful method of F removal from water and wastewater.

Dental and skeletal fluorosis commonly result from elevated fluoride (F) intake, especially from drinking water. Many investigations have reported the F content of air, groundwater, drinking water, bottled water and some forms of black tea.

FS has a high porosity and very high specific surface, and presents suitable pores smaller than 4.5 microns. It is an excellent adsorbent for arsenic, heavy metals, selenium, bromate, phosphate, natural organic matter (NOM) and several other impurities in water/waste water.