地下水中石英砂滤层去除氨氮的动力学方程和基于反应活化能的分析

Kinetics of ammonium removal in groundwater by composite oxides film coating on silica sands and the analysis based on activation energy

在中试条件下考察了成熟石英砂表面滤膜去除地下水中氨氮(NH_4^+-N)的效果,并通过改变不同的进水NH_4^+-N浓度(1.6、2.1、2.5mg·L^(-1))拟合NH_4^+-N反应动力学方程.结果表明,NH_4^+-N在滤层中的去除符合一级动力学方程;当进水流速为5 m·h^(-1)时,滤层厚度为130 cm的成熟石英砂滤层最大NH_4^+-N去除浓度为2.51 mg·L^(-1).同时,通过改变不同的进水温度(10.8、10.9、12.4、14.0℃)测试了NH_4^+-N反应活化能,结果表明,NH_4^+-N在成熟石英砂滤层中氧化所需的活化能为96.8 k J·mol^(-1).

The effect of NH4^＋-N removal by composite oxides film coating on silica sands was studied in a pilot-scale filter column. The kinetics equation of NH4^＋-N was fitted by changing the initial NH4^＋-N concentrations（ 1.6,2.1,2.5 mg·L^-1） in the influents and the results showed that the removal of NH4^＋-N followed a first-order kinetic model. And the maximum load（ NH4^＋-N） removal by composite oxides film coating on silica sands is 2. 51 mg·L^-1. The activation energy of the reaction of NH4^＋-N oxidation was tested to be 96.8 k J·mol^-1by changing the influent temperature（ 10.8,10.9,12.4,14.0 ℃）.