Preparation and Application of Nano-Polyferric Silicate Sulfate Flocculants

A new type of flocculant nano-polyferric silicate sulfate(Nano-PFSS) was prepared by ultrasonic waves using sodium silicate and ferric sulfate.The factors influencing the removal efficiency the wastewater,such as settling performance,coagulant dosage of turbidity,pH and stirring intensity were investigated and the coagulating mechanism was also analyzed in this study.The results of the coagulation-flocculation showed that the performance of nano-polyaluminum ferric silicate was much better than experiments for treatment wastewater that of polyaluminum ferric silicate.Used in dyeing wastewater,the removal ratio of turbidity was 96.6 %,the removal ratio of decolorizing was 93.2 % and the removal ratio of chemical oxygen demand(CODCr) was 53.8 %.