Optimization of Heterogeneous Electro Fenton Process for Textile Wastewater Treatment

Abstract

To produce good textile products, many stable synthetic dyes are invented However, textile wastewater discharged into the environment containing a large amount of dyes which are bio-recalcitrant and stable to heat and solar radiation. These toxic contaminants impact negatively the environment for a long time and poison plant, animal and human. In this study, Heterogeneous Electro Fenton (HEF) system was applied to treat textile wastewater. $Fe_{3}O_{4}-CeO_{2}$ synthesized by co-precipitation method was used as a catalyst and graphite electrodes were chosen for their stability and good conductivity. Three operating factors greatly affected the removal efficiency are current density, pH and catalyst dosage. Response surface methodology was applied to find empirical mathematical models for these factors, then find an accordant operating condition for treatment which provides high removal efficiency and low operating cost. Investigated ranges scaled in previous studies were: current density $(1\theta - 2\theta nWcm2)$, $pH (3 - 5)$; catalyst dosage $(\theta.5-1.5$ gel). At current density of 16.89 $m\mathcal {X}cm^{2}, pH$ of 3.15, catalyst dosage of 1.24 g/l, the treatment reached its optimum condition, under that COD and color removal efficiencies are 95.5 % and $ 97.\theta $ %, respectively, which met the national standard (QCVN 13:2015/BTNMT, Column A).