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| Preparation of polyferric sulfate coagulant with titanium dioxide by-product and waste sulfuric acid |
| 1.School of Environment, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Yangzhou Vocational College of Environment and Resource, Yangzhou, Jiangsu 225127, China) |
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Abstract The by-product of ferrous sulphate from titanium dioxide production and waste sulfuric acid were used to prepare polyferric sulfate (PFS) by direct oxidation. The structure of PFS was characterized by X-ray diffraction, scanning electron microscope and infrared spectrum. The turbidity removal ability of prepared PFS was compared with purchased PFS and FeSO4 in aqueous solution by growing coagulation behaviors in jartest. The results show that the prepared PFS, which is inhomogenous flake with different size and shape, is hydroxybridged polymer of iron. For simulated wastewater treatment, the prepared PFS has good turbidity removal efficiency of 95% with color removal efficiency of 80%, which is comparable with purchased PFS. Floc grows quickly and can reach balance state in short time with large average size of floc.
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2011, Vol. 32 
