超声辅助球磨降解模拟垃圾渗滤液中氨氮的工艺研究

Study Technology of Degradation of NH_3-N from Simulative Landfill Leachate by Ultrasound-assisted Aqueous Solution Ball Milling

为解决目前垃圾渗滤液氨氮降解效率低、成本高等问题,本项目采用超声辅助球磨降解氨氮,分别研究了单独球磨、单独超声、超声辅助球磨各工艺技术对模拟垃圾渗滤液氨氮降解的影响,并通过正交实验探索出了超声辅助球磨降解氨氮的最佳工艺条件.研究结果显示:超声辅助球磨明显优于单独球磨及单独超声,其氨氮去除率可达95.90%,通过正交极值分析,溶液初始pH值对氨氮去除的影响最大,且最佳工艺参数是:初始pH值为12、超声功率为40 W、铁球质量为200 g、球磨速度为500 r/min、反应时间为80 min.

To solve the problem of poor efficiency and high cost on the degradation of NH3-N from landfill leachate, the ultrasound-assisted aqueous solution ball milling is used to degrade NH3-N from landfill leachate. The influence of the operation technology on the efficiency of degradation of NH3-N is investigated, including ball milling and ultrasound treatment alone, ultrasound-assisted aqueous solution ball milling, and the best operation conditions determined by orthogonal test. The result shows that the reduction rate of NH3-N is significantly faster than that by ball milling or ultrasound treatment alone. In this condition, the removal ratio of NH3-N achieved 95.90%, and the initial pH value have a great influence on the reduction rate of NH3-N from the contaminated water by range analysis of orthogonal test. The optimum operation parameters are: the initial pH value is 12, the ultrasonic acoustic power is 40 W, the mass of iron ball is 200 g, the rate of aqueous solution ball milling is 500 r/min, reaction time is 80 min.