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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).
Under the conditions of pilot test, the effect of NH4 + -N removal on groundwater from the surface of mature quartz sand was investigated. By changing the NH4 + -N concentration (1.6, 2.1, 2.5 mg · L ~ (-1)). The results showed that the removal of NH 4 + -N in the filter layer was in accordance with the first-order kinetic equation. When the influent velocity was 5 m · h ~ (- 1), the maximum NH_4 ~ + -N removal concentration of the mature quartz sand filter with the filter layer thickness of 130 cm was 2.51 mg · L -1 .At the same time, by changing the different inlet water temperature (10.8, 10.9, 12.4 , 14.0 ℃). The results show that the activation energy of NH_4 ~ + -N is 96.8 kJ · mol ~ (-1) for oxidation in mature quartz sand filter.