Removal of ammonia nitrogen from hypersaline pickle wastewater by electrochemical oxidation
电化学氧化法去除超高盐榨菜废水中的氨氮

Method of electrochemical oxidation was applied to remove ammonia nitrogen from hypersaline pickle wastewater. The anode was Ti/RuO2-TiO2-IrO2-SnO2 expanded metal sheet electrode. The cathode was expanded metal sheet electrode. The effects of current density, reaction time, electrode distance, initial pH and electrode plate area/water volume ration on removal rate of ammonia nitrogen were systematically investigated. The ammonia nitrogen energy consumption and anode efficiency were analyzed in different current densities. Under the conditions with initial ammonia nitrogen concentration of 472.73 mg/L, current density of 156 mA/cm2, electrode distance of 1.5 cm, electrode plate area/ water volume ration of 0.8 dm2/L and initial pH of 4.3~5.0, removals of ammonia nitrogen were 89.75% and 99.94% within 30 min and 60 min, respectively. The energy consumption was 96 kWh/kg(NH4+-N) and the anode efficiency was 8.47 g(NH4+-N)/(h·m2·A) when reaction time was 30 min.