Effective Decolorization of Eriochrome Black T, Furschin Basic and Malachite Green dyes from Synthetic Wastewater by Electrocoag-nanofiltration

Abstract

This study examines the use of electrocoagulation treatment process followed by nanofiltration process in removing color from synthetic wastewater. Three representative dye molecules were selected for the synthetic dye wastewater:  Azo dye (Eriochrome Black T), Furschin Basic and Malachite Green dyes. Iron electrode was use as a sacrificial anode in the study. The influence of electrolysis time, operating current density, initial pH, initial dye concentration and temperature on process performances was investigated. Experiments were conducted to find the desired conditions for removal of particular concentration of the dyes. The results showed that 91% of Eriochrome Black T, 92% of Furschin Basic and 80% Malachite dye was decolorized for initial dye concentration of 100 mg/l with the current density of 1559 A/m², electrolysis time of 25 minute and initial pH of 10. The electrochemical technique showed satisfactory color removal efficiency and reliable performance in treating the dye types. Electrode mass loss and energy consumed were also calculated.

Keywords: nanofiltration; electrocoagulation; dye; synthetic waste water; removal efficiency; optimization.