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

Abstract

Abstract 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, H 2 O 2 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.