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Electrochemical Treatment of Oilfield Produced Wastewater on Ni-Sb- SnO2/Ti Electrodes

Abstract Nickel and antimony doped tin dioxide (NATO) coated titanium electrodes were used for electrochemical treatment of oilfield produced wastewater. The effects of electrode distance, current density and electrolysis time on COD removal ratio, current efficiency, energy efficiency and BOD to COD ratio were investigated. The optimized electrode distance of 5 mm and current density of 6 mA cm-2 were obtained. Under the optimized conditions, after 150 min electrolysis, COD removal ratio of 85.6% was achieved with energy efficiency of 0.0182 g COD kJ-1 and current efficiency of 86%. However, with 30 min electrolysis, the energy efficiency of 0.0316 g kJ-1 and current efficiency of 149.4% were achieved with BOD to COD ratio increased to 0.51. It indicated that further biological treatment was applicable after 30 min electrolysis. The results showed that NATO had potential applications in oilfield produced wastewater treatment.