Optimization of Decolorization and COD Removal from Textile Wastewater Using Electro Fenton Process

Abstract

Synthetic dye is a widely used product, but dyeing industrial effluents have adversely impacted environment. During dyeing processes, 12% of dye input is wasted, and approximately 20% of this amount is discharged to the environment. In this study, Electro Fenton (EF) system was applied to treat a textile wastewater. H2O2 forming was accelerated by aeration at 1 lair/lsample/min and graphite electrode was used to reduce investment cost. Response surface methodology - Central composite Design (CCF) was used to investigate the effects of pH, Fe2+ concentration, and voltage on the removal efficiency. At pH 2.78, Fe2+ concentration of 2.0 mMol/l, and voltage of 16 V, the treatment system reached its optimum operating condition. Under this condition, color and COD (Chemical oxygen demand) in the effluent were 57 ± 2 Pt-Co and 56 ± 1 mg/l, respectively, after 30 min of treatment which met the national standard (QCVN 13:2015/BTNMT, column A).