Treatment of wastewater dyesstuf by electrooxidation application and optimization using respense surface method

In this study, the removal of colorants from synthetically treated wastewater by electro-oxidation processes using a graphite anode was investigated. The synthetic wastewater treated for the study is combined with cationic dyes such as methylene blue, malachite green and astrazon red. The electro-oxidation process was carried out using 4 graphite anodes and 4 stainless steel cathodes. Thirty experiments were designed for each color using the Design Expert program to determine the experimental conditions on a model. Experiments were carried out with the conditions in the designed model and with the help of the obtained results two-dimensional contour and three-dimensional surface response graphs were created by inserting them into the Design Expert program. In the analyzes performed, the effects of independent initial dye concentration (C0), current (A), supporting electrolyte concentration (SEC), and pH variables on dye removal efficiency and energy consumption were examined. To ensure conductivity, 10 mM, 15 mM and 20 mM NaCl were used as the supporting electrolyte type. The test time was determined to be 15 minutes. With the help of the analysis of the samples taken, the separation efficiency and the energy consumption values were calculated. According to the results of the studies, in addition to increasing current and SEC, removal efficiency increased at low initial dye concentrations and acidic pH values. In addition, it was observed that the energy consumption increased with high current, basic pH values, an increase in the initial dye concentration, and a low SEC.