Electro-oxidation method and kinetic study for treatment of organic dye pollutants in water

The removal of chemical oxygen demand (COD) and color from simulated dye wastewater containing organic dyes, Alizarin Red S, C14H7O7SNa and Alizarin Yellow GG, C13H8O5N3Na were experimentally investigated using an electrochemical undivided cell reactor with Pt as anode and steel as cathode. Particular attention was paid to probe the effect of supporting electrolyte, cell voltage and treatment time on the electrochemical treatment efficiency. Experiments were carried out using 0.2 M NaCl as supporting electrolyte under the condition of free pH. The experimental results showed that the process could efficiently remove the color and COD from simulated dye waste water. The overall COD removal reached as 82.1%-91.4% by using supporting electrolyte and increasing voltage. The process can be described by pseudo first order kinetics for the removal of COD.