CAJ | 학술논문

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10 mg/L、纳米铁投量为5 g/L、硫酸铝投量为100 mg/L时,反应6 h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.
재수체용해양교고적조건하,채용투가류산려적방식강화납미철대초산염담적거제효과.결과표명,투가류산려가명현제고납미철대초산염담적거제효과,당초산염담초시농도위10 mg/L、납미철투량위5 g/L、류산려투량위100 mg/L시,반응6 h후대초산염담적거제솔가체도83%,이불투가류산려적정황하부위51%.납미철대초산염담적환원과정부합의일급반응동역학규률,기반응속솔상수k수납미철투량화류산려투량적증가이증대;납미철대초산염담적거제솔수pH적강저이승고,수초시초산염담농도적증가이하강;납미철환원초산염담적표관활화능교저,환원반응재상온하즉흔용역진행;초산염담적최종환원산물위안담.
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 de-crease of pH and decreases with the increase of the initial nitrate nitrogen concentration. Due to low ap-parent activation energy for reduction of nitrate nitrogen by NZVI, the reduction reaction can be per-formed at normal temperature. The final reduction product of nitrate nitrogen is ammonia nitrogen.