中文摘要：

在水体溶解氧较高的条件下，采用投加硫酸铝的方式强化纳米铁对硝酸盐氮的去除效果。结果表明，投加硫酸铝可明显提高纳米铁对硝酸盐氮的去除效果，当硝酸盐氮初始浓度为10mg／L、纳米铁投量为5g/L、硫酸铝投量为100mg／L时，反应6h后对硝酸盐氮的去除率可达到83％，而不投加硫酸铝的情况下仅为51％。纳米铁对硝酸盐氮的还原过程符合拟一级反应动力学规律，其反应速率常数k随纳米铁投量和硫酸铝投量的增加而增大；纳米铁对硝酸盐氮的去除率随pH的降低而升高，随初始硝酸盐氮浓度的增加而下降；纳米铁还原硝酸盐氮的表观活化能较低，还原反应在常温下即很容易进行；硝酸盐氮的最终还原产物为氨氮。

英文摘要：

The removal effect of nitrate nitrogen by nanoscale zero-valent iron （NZVI） was en- hanced by addition of aluminium sulphate with high dissolved oxygen content. The result shows that the addition of aluminium sulphate can significantly improve the removal effect of nitrate nitrogen by NZVI. When the initial nitrate nitrogen is 10 mg/L, the NZVI dosage is 5 g/L, and the reaction time is 6 h, the removal rate of nitrate nitrogen reaches 83% with addition of aluminium sulphate of 100 mg/L, and 51% without addition of aluminium sulphate. The reduction process of nitrate nitrogen by NZVI follows the pseudo-first-order reaction kinetics. The higher the dosages of NZVI and aluminium sulphate are, the bigger the reaction rate constant k is. The removal rate of nitrate nitrogen by NZVI increases with the decrease of pH and decreases with the increase of the initial nitrate nitrogen concentration. Due to low apparent activation energy for reduction of nitrate nitrogen by NZVI, the reduction reaction can be performed at normal temperature. The final reduction product of nitrate nitrogen is ammonia nitrogen.