Optimization of Operating Parameters in the Removal of Synthetic Textile Dyestuff with the Electrocoagulation Process

Electrocoagulation (EC) is one of the most effective electrochemical wastewater treatment techniques for removing color and organic pollutants from wastewater and reducing sludge formation. In this study, the removal of Remazol Ultra Red RGB (reactive red ۲۳۹) dye, which is used for commercial purposes, by the EC process was investigated. For this purpose, an electrochemical reactor was designed using monopolar parallel connected aluminum and iron electrodes. The effect of operational parameters such as the initial pH of the solution, current density, and electrolysis time were investigated to achieve higher color, Chemical Oxygen Demand (COD), and turbidity removal efficiency. The optimum conditions of the EC process were determined by evaluating the data obtained as a result of the experimental studies. It was observed that the removal efficiency increased with the increase of the electrolysis time and stabilized after ۲۰ min. The optimum experiment conditions for the aluminum electrode were pH:۳, a current density of ۵۰ A/m۲, and a conductivity of ۲۵۰ µS/cm, for the iron electrode was pH: ۵, a current density of ۷۵ A/m۲, and a conductivity of ۵۰۰ µS/cm were found as. In all studies, the mixing speed was chosen as ۲۵۰ rpm. As a result of this study, ۹۵.۴۹-۹۹.۹۴% color, ۸۹.۳۴-۶۶.۸۳% COD, and ۹۲.۱۸%-۸۳.۱۵% turbidity removal efficiencies were obtained with aluminum and iron electrodes under optimal conditions. Under optimum conditions, electrical energy consumption was calculated as ۱۱.۴۸ for Al, ۶.۶۰ kWh/m۳ for Fe, and the energy consumption ۰.۵۶, ۰.۴۶ kg/m۳. As a result of the experimental studies, high removal efficiencies were obtained in color, COD, and turbidity removal with the EC process. As a result, it was concluded that EC treatment is an effective method for the purification of synthetic textile dyestuffs.

کلیدواژه ها:

Textile dye ، electrocoagulation ، Decolorization ، COD removal ، Electrode material ، operating parameters