Abstract

Removal of organics from metalworking fluids (MWFs) by batch electrocoagualtion process using iron electrodes

Author(s): Electrocoagulation, COD, pH, Electrolysis time, Color, MWFs, Kinetics.

This study elucidates the reduction of organics from metalworking fluid (MWFs) through batch electrocoagulation (EC) reactor using iron electrodes. The effect of the working parameters, such as current density (0.8- 3.0A/dm2) and electrolysis time (330 min) were investigated in this system to achieve a maximumchemical oxygen demand (COD) and color removal efficiency for MWFs effluent. Aconstant current density of 0.8A/dm2 was maintained throughout the process. During EC treatment the pH increases and reaches a maximum of 6.8 at 210 min where maximumCOD and color removal efficiency of 85% and 95% respectively; were observed. The resultswere analyzed using kineticsmodels and a high coefficient of determination value (R2=0.9948) for first-order regression model was observed. This study shows that EC technique can be employed to treat MWFs and reduce the pollutant load before biological treatment process to meet the discharge standards. The results suggest an important role of these parameters in electrochemical process for removal of organic pollutants.