Abstract:

To solve the problem of failing to reach the chroma standard of the coking waste water after the biological treatment with A/O process, the dicyandiamide-formaldehyde cation decolorizing flocculant is synthesized with dicyandiamide and formaldehyde as main feedstock. The decolorizing test of coking waste water is carried out. The result shows that when the colority of coking waste water is 158, pH value is 7 and adding amount of flocculant is 8mL/L, the decolorizing rate can be up to 61.21%.