Preparation and performance of oxidative poly-silicon-ferric coagulant PSFN

Abstract

A new polymer, poly-silicon-ferric with oxidization (PSFN) coagulant was produced by adding KMnO₄ and stabilizer M to poly-silicon-ferric (PSF) coagulant. The micro properties of PSFN was investigated with optical microscope, transmission electron microscope(TEM), ultraviolet/visible absorption(UVA) scanning, infrared(IR) spectrometer and oxidation-reduction potential (ORP) meter respectively, compared to that of PSF. The coagulation behavior by PSFN was investigated compared to that by PSF. The results show that the micro properties of PSF have been changed greatly due to the addition of KMnO₄, and there exists KMnO₄ unattached in PSFN. A kind of tetrahedron structure somewhat like the connection of Si-O-Si bonds may be formed by the complexation of Mn (maybe in various valence) with PSF. PSFN has lower turbidity removal than PSF at lower dose and achieves the same when the dose reaches a definite amount, while the removal of UV₂₅₄ by PSFN is higher than that by PSF almost over entire dose range with the largest difference of about 17%. PSFN has more oxidization function at acidic condition than that at basic condition, and gives stronger ability of application for treating various waters than that by PSF.

Keywords

poly-silicic-ferric (PSF) / coagulant / KMnO₄ / oxidization / micro properties / coagulation behavior

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