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Treatment of Biodiesel Wastewater by Combined Electroflotation and Electrooxidation Processes

The objective of this research was to determine the optimum conditions for biodiesel wastewater treatment using a combined electroflotation and electrooxidation process in a bench-scale reactor. The effects of current density, conductivity, and reaction time were studied and optimized. The experimental results show that electroflotation (pre-treatment) could effectively remove turbidity, total solids, oils and greases, chemical oxygen demand and methanol by 92%, 98%, 100%, 57%, and 23%, respectively, using aluminum electrodes and applying a current density of 8.0 mA cm−2 for a reaction time of 60 min. After pre-treating, the effluent was subjected to electrooxidation using Ti/RuO2 anodes. The efficiency of the applied current density and reaction time were evaluated and optimized. The experimental results shows that electrooxidation could effectively remove the residual methanol and chemical oxygen demand by 68% and 95%, respectively, by applying a current density of 40.0 mA cm−2 for a reaction time of 240 min.