Decolorization of Reactive Red K-2BP wastewater in fixed-bed column system packed sponge iron

摘要

The decolorization of Reactive Red K-2BP wastewater with sponge iron in a fixed-bed column system was evaluated at different influent water qualities (pH, dye concentration), particle diameter of sponge iron and filtrate rate. The decolorization efficiencies at influent pH of 6 were superior to those at influent pH of 5 and 7.5. The decolorization efficiency decreased with increments of filtration rate, influent dye concentration and particle size of the sponge iron. Under optimal conditions, over 94% of decolorization efficiency could be obtained. X-ray diffraction (XRD) of sponge iron showed Fe0 was transformed to Fe3.6O0.4(O, OH, Cl)9, magnetite (Fe+2Fe2+3O4) and lepidocrocite Fe+3O(OH) after the reaction.