Electrochemical treatment of biologically pre-treated dairy wastewater using dimensionally stable anodes

摘要

In this work, electrochemical oxidation of aerobically pre-treated dairy wastewaters using lrO_2-Pt coated dimensionally stable anodes was investigated. It was found that IrO_2/Ti electrode outperforming Pt/Ti and IrO_2-Pt/Ti at lower current densities, while Pt/Ti achieved better efficiency at higher current density. Among the different parameters which were studied, the current density was the most crucial for the efficiency of the process. A current density of 100 mA/cm~2 led to almost complete removal of 3700 mg/L COD after 360 min of treatment using IrO_2/Ti electrode and 0.2 M of sodium chloride while complete decolonization was achieved in less than 60 min. Electrolytes also found to significantly affect the process. More specific, the use of sodium chloride instead of sodium sulfate enhanced both COD and color removal due to the formation of active chlorine species. The effect of temperature was relative low; the process was favourable at elevated temperatures while increasing COD loading resulted in a decrease of COD and color removal.