Application of Response Surface Methodology for the Treatment of Dairy Wastewater by Electro-Fenton Process

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IJEP 43(2): 119-126 : Vol. 43 Issue. 2 (February 2023)

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R. Lavanya and Rashma Shetty*

University BDT College of Engineering, Department of Civil Engineering, Davangere – 577 004, Karnataka, India

Abstract

In this research, the treatment of dairy industry effluent by electro-Fenton process using aluminium plate electrodes for the removal of parameters, such as chemical oxygen demand (COD) and total suspended solids (TSS) were studied. The experimental design and optimization of independent variables, such as Fenton dosage (x1), electrolysis time (x2) and electric current (x3) were evaluated by means of Box-Behnken design (BBD) in response surface methodology (RSM). The second-order quadratic model was utilized for the prediction of removal percentage of COD and TSS in several operational conditions. The true impact of each independent variable and relationship between dependent and independent variables was analyzed by using analysis of variance (ANOVA). The treatment efficiency of electro-Fenton (E-F) process for the removal of TSS and COD was studied by varying the independent variables, such as Fenton dosage (0.01-0.02) mol/L, electrolysis time (20-40 min) and electric current (2-4 A). The optimal conditions of independent variables for maximum removal efficiencies of responses are Fenton dosage of 0.015 mol/L, electric current of 3A and electrolysis time of 40 min. The maximum removals of COD and TSS at optimized conditions are found to be 86.19% and 91.75%, respectively.

Keywords

Electro-Fenton, Response surface methodology, Box-Behnken design, Analysis of variance, Chemical oxygen demand, Total suspended solids

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