Advanced treatment of actual textile dye wastewater by Fenton-flocculation process

To improve the performance of actual textile dye wastewater treatment, an advanced treatment combining the Fenton and flocculation processes was developed. The parameters affecting decolorization in the Fenton-flocculation process, including initial pH, H2O2 dosage, Fe(2+)dosage, reaction temperature, reaction time, and flocculant dosage, were examined. With the optimal Fenton-flocculation condition parameters, more than 95% COD removal, 99% colour removal, and 99% turbidity removal were obtained. UV-visible spectra of raw water and supernatant were further obtained after the Fenton-flocculation process, and results demonstrated that the chromophoric groups and the conjugated system in the dye molecular structure were destroyed. All these results confirmed that the Fenton-flocculation process was a favourable and effective post-treatment method for actual textile dye wastewater.