Fractal dimension analysis of lead flocs formed by high-ferric-based silicon coagulant

Key words:  high-ferric-based silicon coagulant  fractal theory  flocs  fractal dimension

Abstract:

The high-ferric-based silicon coagulation and PPFS were used to deal with the industrial wastewater containing lead. The effect of fractal dimension on lead flocs and the relationship between fractal dimension and the lead removal rate were investigated. The results show that the optimal dosage of high-ferric-based silicon coagulation and pH value are 3.5 mL/L and 9.5 when treating the simulation industrial wastewater containing lead. Under this condition the fractal dimension is the largest, the lead flocs are the densest and the lead removal rate is the highest. Also the fractal dimension and the lead removal rate have a good correlation. The optimal dosage is 8 mL/L and the lead removal rate is 92.5％ when treating the actual industrial wastewater containing lead by the high-ferric-based silicon coagulation. And the effect of high-ferric-based silicon coagulation is better than that of PPFS. The fractal dimension and the lead removal rate of two coagulants also show a good correlation.