CAJ | 학술논문

[目的]研究曝气扰动下底泥氮的释放动力学及硝化反硝化过程，以期解决底泥氮释放及二次污染问题。[方法]研究了底泥原位曝气对氮污染物释放的影响，并对其释放动力学参数进行解析，同时模拟了间歇曝气下泥水界面硝化反硝化脱氮过程。[结果]底泥曝气加速了氮污染物的释放，30min后底泥NH4＋-N与达到释放平衡；最大释放量与底泥扰动强度成正比，在曝气头距离泥面距离为0、1、2和3cm时（扰泥量为3．52、3．41、3．26和3．01g/L），NH4＋．N与最大释放量分别为14.3、13．8、13．2、12．2mg／L和33.2、30．9、29.8、27．3mg／L；且两者的释放动力学均符合舣常数方程。持续曝气可促进泥水界面硝化反应发生，8d后NH4＋-N浓度由12．4mg／L下降至0．2mg／L，硝态氮浓度达到最大值；停止曝气12d后，硝态氮与总氮浓度分别由10．8和37．4mg／L下降至0．36和23．2mg／L，说明有反硝化脱氮现象发生。可见，底泥曝气可促进氮污染物的释放及硝化过程，而通过间歇曝气，可实现底泥原位硝化反硝化脱氮。[结论]该研究结果可为城市黑臭河道底泥原位修复提供技术借鉴。
[목적]연구폭기우동하저니담적석방동역학급초화반초화과정，이기해결저니담석방급이차오염문제。[방법]연구료저니원위폭기대담오염물석방적영향，병대기석방동역학삼수진행해석，동시모의료간헐폭기하니수계면초화반초화탈담과정。[결과]저니폭기가속료담오염물적석방，30min후저니NH4＋-N여체도석방평형；최대석방량여저니우동강도성정비，재폭기두거리니면거리위0、1、2화3cm시（우니량위3．52、3．41、3．26화3．01g/L），NH4＋．N여최대석방량분별위14.3、13．8、13．2、12．2mg／L화33.2、30．9、29.8、27．3mg／L；차량자적석방동역학균부합의상수방정。지속폭기가촉진니수계면초화반응발생，8d후NH4＋-N농도유12．4mg／L하강지0．2mg／L，초태담농도체도최대치；정지폭기12d후，초태담여총담농도분별유10．8화37．4mg／L하강지0．36화23．2mg／L，설명유반초화탈담현상발생。가견，저니폭기가촉진담오염물적석방급초화과정，이통과간헐폭기，가실현저니원위초화반초화탈담。[결론]해연구결과가위성시흑취하도저니원위수복제공기술차감。
[Objective] This study aimed to investigate the nitrogen release kinetics and nitrification-denitrification on surface sediments under aerating disturbance condition, with the purpose to solve the sediment nitrogen release and secondary pollution problems. [Method] The effect of in situ sediments aeration on the release of nitrogen pollutants was investigated, and the nitrogen release kinetics parameters were analyzed. The process of nitrification and denitrification under sediments aeration condition was investigated in laboratory. [Result] The nitrogen released from sediments was enhanced by aeration disturbance. The concentration of NH4＋-N and TN reached the maximum value in 30 min, and release rates were proportional to the disturbance strength. In this study, with the distance of aerator to the sediments surface of 0, 1, 2 and 3 cm, the suspended sediments concentrations were 3.52, 3.41, 3.26 and 3.01 g/L, respectively. Maximum release concentration of NH4＋-N and TN were 14.3, 13.8, 13.2, 12.2 mg/L and 33.21, 30.98, 29.83, 27.30 mg/L, respec- tively. In addition, both NH4＋-N and TN release kinetics could be described by Double Constant Equation as InC=A＋Blnt. Nitrification reaction occurred and was promoted by continued aerating to sediments.The concentration of NH4＋-N dropped down from 12.4 mg/L to 0.2 mg/L in 8 d, with the concentration of NO3--N increased to the maximum value of 10.8 mg/L. In addition, concentration of NO3--N and TN decreased from 10.8 mg/L and 37.4 mg/L to 0.36 mg/L and 23.2 mg/L after the stop of aeration for 12 d, indicating the occurrence of denitdfication reaction. Therefore, sediment aeration could accelerate nitrogen release and nitrification reaction, and with intermittent aeration, nitrogen could be removed from sediments in-situ by nitrification and denitrification. [Conclusion] The results provided technical reference for the in situ sediment remediation for the black-odor rivers in cities.