Fluoride removal from drinking water by electrocoagulation in a continuous filter press reactor coupled to a flocculator and clarifier

摘要

This investigation is about fluoride removal from synthetic drinking water (10 mg L~(-1)F~ in 0.5 gL~(-1)Na2SO4 and 1.5 mg L~(-1)ClO~- at pH 7.7 and conductivity 410 μS cm~(-1)), by electrocoagulation (EC) using aluminum as the sacrificial anode in a continuous filter press reactor coupled to a flocculator and clarifier (sludge settler). The influence of current density (j) and linear flow velocity in the EC reactor (μ_r) on the fluoride removal efficiency was analyzed. The EC tests that satisfy the WHO norm for fluoride (C_F< 1.5mgL~(-1)) were obtained at 0.91 < u_r< 1.82 cm s~(-1)and 5