nvestigated ranges scaled in previous studies were: current density (10 – 20 mA/cm2 ), pH (3 – 5), and catalyst dosage ( – g/l). At current density of mA/cm2 , pH of , catalyst dosage of g/l, the treatment reached its optimum condition, COD and Color removal efficiencies were % and %, respectively, where COD and Color values in the effluent are 56 mg/l and 16 Pt-Co. | Vietnam Journal of Science and Technology 56 (2C) (2018) 194-200 HETEROGENEOUS ELECTRO FENTON PROCESS FOR TEXTILE WASTEWATER TREATMENT: APPLICATION OF Fe3O4-Mn3O4 AS A CATALYST Nguyen Duc Dat Duc1, 2, Nguyen Thi Chi Nhan1, Nguyen Hoang Ha2, Nguyen Tan Phong1, * 1 2 Ho Chi Minh City University of Technology, VNU-HCM, 268 Ly Thuong Kiet, HCMC City Ho Chi Minh City University of Food Industry, 140 Le Trong Tan, Tan Phu District, HCMC * Email: ntphong@ Received: 18 May 2018; Accepted for publication: 23 August 2018 ABSTRACT To produce quality textile products, many stable synthetic dyes are invented. However, textile wastewater discharged into the environment contains a large amount of dyes which are bio-recalcitrants and stable to heat and solar radiation. These toxic contaminants impact negatively the environment for a long time and poison plants, animals, and human. In this study, Heterogeneous Electro Fenton process with Fe3O4-Mn3O4 as a catalyst was used for textile wastewater treatment. 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 (10 – 20 mA/cm2), pH (3 – 5), and catalyst dosage ( – g/l). At current density of mA/cm2, pH of , catalyst dosage of g/l, the treatment reached its optimum condition, COD and Color removal efficiencies were % and %, respectively, where COD and Color values in the effluent are 56 mg/l and 16 Pt-Co. Keywords: Heterogeneous Electro Fenton; textile wastewater; Fe3O4-Mn3O4; Box Behnken. 1. INTRODUCTION Main pollution in textile wastewater often originate from dyeing and .
