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The method of printing and dyeing wastewater treatment flocculation, oxidation , adsorption , and biochemical processing . Flocculation method with its small footprint, low cost , easy management advantages to become one of the common methods of treatment of dyeing wastewater . Traditional inorganic flocculants hydrophobic dye decolorization efficiency , but poor water-soluble good decolorization effect . Find and develop new efficient decolorizing coagulant, it is very necessary . In this paper, poly aluminum ferric sulfate lanthanum flocculant (La-PFASS), a new rare earth complex inorganic polymer flocculant composite copolymerization , sodium silicate , aluminum sulfate , ferric sulfate , and the rare earth lanthanum carbonate as raw material to be prepared . The preparation method is: polysilicate and ferroaluminum lanthanum reaction prepared La - PFASS is further added at room temperature, under acidic conditions, using sodium silicate preparing polysilicate , ferroaluminum lanthanum solution . Of reactive brilliant blue KN- R restore Scarlet R disperse red E -4B , Direct Black FF simulated dye wastewater coagulation treatment investigated the La-PFASS flocculant ( Al Fe) / Si molar ratio , Al / Fe molar ratio of rare earth lanthanum dosage , dosage and pH value of wastewater flocculation effect , to optimize the preparation conditions, to determine the optimal working parameters of various wastewater treatment , and to explore the La-PFASS flocculant dye Wastewater mechanism of action . The test results show that , of La-PFASS prepared flocculant flocculation of dye wastewater decolorization performance . Dealing with non - ionic hydrophobic dye (reducing red R and Disperse Red E -4B ) wastewater flocculation effect is more obvious , the dosage of 14mg / L , turbidity removal efficiency and decolorization rate reached 90 % . Deal with water-soluble dyes ( Reactive Blue KN - R direct black- FF ) wastewater flocculation effect of relatively poor dosage of 14mg / L , the decolorization rate was only about 80% . With the La-PFASS flocculant to treat the actual wastewater better flocculation effect , the dosage of 35mg / L, turbidity removal efficiency and decolorization rate reached 81.0% , 76.5% . This article was prepared La-PFASS flocculant is a highly efficient , having a large molecular weight of the inorganic polymer composite flocculant , which both electrostatic and bond adsorption netting volume sweeping effect on the more difficult to handle non-ionic hydrophobic dye wastewater the excellent flocculation decolorization performance is a promising flocculant .
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