A new kind of inorganic polymer flocculant, the solid composite polyferric sulfate (SPFS) was prepared using ferrous sulfate and Na-Bentonite. The obtained SPFS was characterized by FT-IR spectra, thermogravimetric analysis (TG), scanning electron microscope (SEM) and X-ray Diffraction (XRD). It showed that SPFS was a kind of composite inorganic polymer, which was the complex of PFS and Na-Bent, not only a simple mixture of raw materials. The synthetic mechanism and surface structure of SPFS were also discussed. Acting as a kind of environment-friendly flocculating agent, the solid composite polyferric sulfate (SPFS) was applied in pretreatment of potato starch industry wastewater, a typical wastewater containing high concentration organic compounds, which COD was above 6,000 mg/L. The results showed that the COD removal value reached 4,070 mg/L with COD removal rates being 46.6%. Based on these results, it is suggested that the SPFS can be attractive pretreatment agent for the starch industry wastewater.
Preparation of solid composite polyferric sulfate and its flocculation behavior for wastewater containing high concentration organic compounds
R. M. Wang, Y. Wang, Y. F. He, F. Y. Li, Y. Zhou, N. P. He; Preparation of solid composite polyferric sulfate and its flocculation behavior for wastewater containing high concentration organic compounds. Water Sci Technol 1 June 2010; 61 (11): 2749–2757. doi: https://doi.org/10.2166/wst.2010.074
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