Abstract:

CuO-CeO₂/γ-Al₂O₃ heterogeneous catalyst has been used for replacing the insulation material of the bipolar packed bed cell,so as to establish a new electro-catalytic oxidation system.The effects of the influential factors,such as cell voltage,pH,airflow and electrode span on the removal efficiency of ammonica-nitrogen(NH4_-⁺N) from landfill leachate are investigated,and appropriate reacting conditions are confirmed.When pH of landfill leachate is 7,cell voltage 15.0 V,aerate dosage 0.08 m³/h,and electrode span 3.0 cm,the removal rate of ammonia-nitrogen can reach over 95%.The electro-catalytic oxidation degradation of the landfill leachate is analyzed by kinetics.It is found that the removal of NH4_-⁺N accords with the pseudo-first-order equation of kinetics.Moreover,the biodegradability of the effluents has been improved from 0.107 to 0.524 after the treatment

Key words: landfill leachate, electro-catalytic oxidation, catalyst, ammonia-nitrogen

摘要：

利用CuO-CeO₂/γ-Al₂O₃多相催化剂替代复极性固定床电解槽中的绝缘填料,构建新型电催化氧化体系。考察了槽电压、pH、气体流量和极板间距等因素对垃圾渗滤液中氨氮(N⁺H₄-N)去除效果的影响,确定了适宜的反应条件。当槽电压为15.0V、pH=7、曝气量为0.08m³/h、极板间距为3.0cm时,反应180min后,对NH4+-N的去除率能达到95%以上。对渗滤液的电催化氧化降解进行动力学分析,NH4+-N的脱除符合准一级动力学方程。经过该体系处理渗滤液,出水的可生化性由0.107提高至0.524。

关键词: 垃圾渗滤液, 电催化氧化, 催化剂, 氨氮

CLC Number: 

• X703.1