Electrochemical Oxidation of the Effluent from Coking Wastewater Treatment Plants Using Ti/RuO2-IrO2 Electrode

This paper explored the electrochemical oxidation of coking wastewater with Ti/RuO2-IrO2 anode. The effects of electrodes connections, area-volume ratio and aeration on the removal efficiency were studied and the ammonia removal mechanism was investigated. The results show that the highest NH4+-N and COD removal efficiency and current efficiency are achieved at the area-volume ratio of 14.44m2/m3 and electrode distance of 0.5cm. Unipolar connection is better than bipolar connection. For electrochemical oxidation of ammonia, the chloride ion is the main factor affecting nitrogen removal. NH4+-N is removed mainly by the oxidation of hypochlorous.