Preparation of polymeric phosphate ferric sulfate flocculant and application on coking wastewater treatment

Abstract

Na2HPO4 and Polymeric ferric sulfate (PFS) were used as raw materials to synthesize the polymeric phosphorus ferric sulfate (PPFS) in the laboratory, which was used for the treatment of coking wastewater. Effects of nPO43-/ nFe3+, preparation temperature, preparation time, and dosage on flocculation influence were discussed by single factor experiment. The results indicated that PPFS had superior flocculation effect for coking wastewater. Total organic carbon (TOC) minimum concentration can be reduced to 23.88mg/L, and the removal rate of TOC was above 60% when nPO43-/ nFe3+ is 0.3, preparation temperature 80 °C, preparation time 60min and the dosage 0.8ml/L. In addition, the structure of PPFS was characterized by SEM, and mechanism of flocculation was discussed.