Abstract
A novel inorganic polymer flocculant, poly-ferric sulfate (BPFS) was prepared by oxidation of ferrous sulfate using domestic Thiobacillus ferrooxidans ( T·f) under acid condition. The optimal conditions for the preparation were pH value of 1.5, (NH 4) 2SO 4 dosage of 0.5 g/L, initial Fe 2+ concentration of 45g/L, inoculum 10%, rotating speed of 120 r/min, reaction time of 5-6 d and reaction temperature of 30 °C. Under the optimal conditions, the BPFS product with pH value of 1.5-2.2, basicity of 17.5%-22.7% and total iron content of 43.87-45.24 g/L was obtained. The application of the BPFS to three wastewaters was carried out, and the removal efficiencies of COD, decolorization and Zn 2+ by BPFS can be reached 70%, 90% and 99%, respectively. The result suggests that the BPFS is an excellent flocculant for water treatment.
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