Studies on fluoride removal by electroadsorption in three-dimensional electrode dynamic reactor
三维电极电吸附动态反应器的除氟特征研究

Electroadsorption dynamic reactor with self-made hydroxyl zirconium oxide as the three-dimensional electrode particles was employed to purify drinking-water contaminated by excessive fluoride.The results showed that the optimum structure parameters for this dynamic reactor with the nafion 117 membrane as the diaphragm was 20 cm height of packed bed,and 4 cm electrode distance.Furthermore,either the voltage increase or the inflow velocity or pH value decrease within a certain range would result in the improvement of fluoride removal efficiency,and the optimal operation conditions gained in this study were voltage of 7 V,inflow velocity of 4 mL/min and acid pH values.The obviously negative effects of humic acid and carbonate ions on fluoride removal efficiency were observed,however,lower chloride ion concentration in the raw water can promote adsorption efficiency of fluoride.In addition,fluoride ions on the surface of three-dimensional electrode particles after electroadsorption were detected by SEM-EDX measurements,and no corrosion was observed.