Research On Removing Fluorine Of Drinking Water By Coagulation And Filtration In Bai Yun

According to the water supply source used the mining area in Bai Yun , based on the mechanism of coagulation and flocculation, the feasibility of removing fluoride from water with the method of coagulation and filtration is studied through experiment. And several key parameters which affect defluorination are also analyzed. By using Polyaluminum Chloride (PAC) as coagulant, the optimum ranges of the operational parameters are obtained.It is shown that the effect of PAC removing fluoride is closely related to pH value and the optimum range of pH value is between 6.1 ?7.1.Under this condition, further studies are made on the optimum coagulant dosage, mixing time, artificial turbidity, filtration rate and filter bed's depth and the optimum range of these parameters have been determined. In addition, the result of comparing the coagulating filtration method with the coagulating sedimentation method shows that the former method is superior to the latter one when other conditions are fined. Finally, a primary estimation of operation cost for defluorination using PAC as coagulant is made.