Experimental Study on Effects of Polymerized Aluminum Chloride-Polyacrylamide on Treatment of Fluoride-Containing Industrial Wastewater
Fluoride-containing industrial wastewater was treated by using a composite coagulant of polymerized aluminum chloride(PAC)and polyacrylamide(PAM),and effects of PAC dosage,PAM concentration,pH value,reaction time and stirring speed on fluoride removal efficiency were explored.The results show that by adding 4400 mg/L PAC,with PAM concentration of 1 mg/L,solution with pH of 7.0,reaction time of 20 min and stirring speed of 300 r/min,the fluoride removal rate can reach 97.98%,leading to the residual concentration of fluoride ion at only 0.81 mg/L.However,the presence of impurity ions can reduce the fluoride removal rate by PAC.
wastewater treatmentpolymerized aluminum chloride(PAC)fluoride-containing wastewaterfluoride removalcoagulation and sedimentation
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