A STUDY ON ELECTROCHEMICAL REDUCTION FOR COLOUR REMOVAL OF DYE WASTE

A STUDY ON ELECTROCHEMICAL REDUCTION FOR COLOUR REMOVAL OF DYE WASTE

Kena S. Lakhani, Asst. Prof. Kalpana Saini

Student Faculty

Environmental Engineering,

Swarrnim Institute of Technology, Gandhinagar, India

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Abstract: Treatment of wastewater is one of the biggest challenges faced by dye manufacturers. The aim of this study is to check the suitability of electrochemical reduction for the colour removal of dye wastewater and comparison between treatment of live waste and synthetic waste. Electrochemical reduction of dye, acid black 210 was observed in divided cell with the help of the cation exchange membrane. Here as an anode graphite plate was used and as a cathode two plates, graphite and Titanium (Ti) were studied. Sodium sulphate (Na2SO4) of analytical standard grade was used as electrolyte. Parameters like initial pH, current density, material of electrode and time for decolourization was studied and optimum condition for colour removal of wastewater was derived. Experiments were run at different current densities like 10,15,20,25,30,40 mA cm^-2. For synthetic waste When graphite was used as the cathode, optimum colour removal was 63% at current density of 15 mA cm^-2 after 120 minutes. Then Ti was used as the cathode, optimum colour removal was 60% at current density of 15 mA cm^-2 after 120 minutes. For live waste When graphite was used as the cathode, optimum colour removal was 70% at current density of 30 mA cm^-2 after 120 minutes. Then Ti was used as the cathode, optimum colour removal was 56.28% at current density of 35 mA cm^-2 after 120 minutes.

Index Terms – Electrochemical reduction, dye wastewater, decolourization