Abstract:
This research aims to study the application of Electro-coagulation (EC) and Advanced oxidation process as Fenton Electro-Fenton (EF) and Photo-Electro Fenton for treating the cutting oily-wastewater. Cutting oil concentration of 1 g/l. For the EC process, the influence of different parameters such as current density, electrode distance and effluent characteristics (pH, conductivity TDS and concentration of Ferrous ion) were investigated. The study showed that the highest treatment efficiency from EC process 90% (≈ Cutting oil concentration of 0.1 g/l) of can be obtained with electrode distance, current density and operating time equal to 1 - 3 cm, 36 - 60 A/m² and 30 - 60 minutes, respectively. However, the effluent did not comply with the industrial effluent standard in term of COD. Therefore, the Fenton Electro-Fenton and Photo-Electro Fenton processes should be applied as post-treatment process in order to improve the overall treatment efficiency. The remaining oil-droplets can be oxidized by the strong oxidizing agent (Hydroxyl radical, ⋅OH ). Moreover, the effect of current density concentration of Hydrogen peroxide ( F/H ratio by mass ) and retention time. The optimal operating conditions, by using the EF process, were current density 71.43 A/m², F/H ratio 1:5 1:10 and operating time 15 - 60 minutes. Finally, the continuous system of EC and EF as pre and post-treatment processes provided 99% overall treatment efficiency, and thus the treated effluent that passed the standard