Parametric study of electro-Fenton treatment for real textile wastewater, disposal study and its cost analysis

Treatment of real textile wastewater by electro-Fenton method was investigated using Ti/RuO2 electrodes. The performance of the treatment process was evaluated in terms of %chemical oxidation demand removal; %color removal; and energy consumed, at three electro-Fenton process parameters: current, electrolysis time and ferrous sulfate concentration. To determine the optimum operating conditions, multiple responses optimization based on Box-Behnken design with desirability function was used. The optimum value of parameters were found to be current=0.32A, time=90min and ferrous sulfate concentration=0.53mM.Box-Behnken design suggested the %chemical oxidation demand removal; %color removal; and energy consumed were 100%, 90.30% and 1.27Wh, respectivelyat optimized process parameters. The predicted performance parameters agree well with the experimental data. Second-order kinetic model was fitted to the experimental data, at optimum conditions. GC-MS analysisconfirmed that dye components were totally eliminated after electro-Fenton treatment of textile effluent. To determinedthe toxicity of the treated textile effluent bioassay analysis was performed. It was identified that the generated by-products were non-toxic in nature.The total cost to treat the 1m(3) of real textile wastewater by electro-Fenton at optimum conditions was$ 3.13.