Ti/RuO2-TiO2-IrO2-SnO2电极电解氧化含氨氮废水

研究了含氨氮(NH^＋₄-N)废水在循环流动式电解槽中的电化学氧化，其中阳极为Ti/RuO₂-TiO₂-IrO₂-SnO₂网状电极，阴极为网状钛电极.考察了出水放置时间、进水流量和电流密度对氨氮去除的影响，并对能耗、阳极效率和瞬时电流效率（ICE）进行分析.结果表明，在氯离子浓度为400　mg/L，初始氨氮浓度为40 　mg/L时，进水流量对氨氮去除的影响不大，电流密度的影响比较大.在进水流量为600 mL/min，电流密度为20 mA/cm² ，电解时间为90 min时，氨氮去除率为99.37％，去除1 kg氨氮的能耗和阳极效率为500 kW·h和 2.68 h·m²·A，瞬时电流效率（ICE）为0.28.表明电解氧化含氨氮废水具有较好的应用前景.

Electrochemical Oxidation of Ammonia Nitrogen Wastewater Using Ti/RuO2-TiO2-IrO2-SnO2 Electrode

Electrochemical oxidation ammonia is a new method of ammonia nitrogen wastewater treatment. A study was undertaken of electrochemical oxidation ammonia wastewater in cycle mobil-electrobath. The anode was Ti/RuO2-TiO2-IrO2-SnO2 expanded metal sheet electrode. The cathode was expanded metal sheet electrode. The parameters investigated were the optimal available time for the measurement of ammonia nitrogen, flowrate and current density. The energy consumption, anode efficiency and current efficiency were analysed in different current densities. Experimental results show that when the concentration of the chlorine ion was 400 mg/L and the initial ammoniac nitrogen concentration was 40 mg/L, the flowrate had little impact on ammonia nitrogen removal, but current density had greater impact. Under the condition with flowrate 600 mL/min, current density 20 mA/cm2, electrolytic time 90 min, ammonia nitrogen removal ratio was 99.37%. The energy consumption was 500 kW x h and the anode efficiency was 2.68 h x m2 x A per kg NH4+ -N removed, and instantaneous current efficiency (ICE) was 0.28. Research has shown that electrochemical oxidation ammonia wastewater has better prospects.