O_(3)/CaO_(2)协同氧化快速降解低浓度氨氮  

Rapid Degradation of Low Concentration Ammonia Nitrogen by O_(3)/CaO_(2) Co-Oxidation

作　　者：刁飞 柯凡 潘长磊[2] 孙宇 DIAO Fei;KE Fan;PAN Changlei;SUN Yu(University of Chinese Academy of Science,Beijing 100049,China;State Key Laboratory of Lakes and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Science,Nanjing 210008,China)

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室,江苏南京210008

出　　处：《水处理技术》2022年第2期39-43,48,共6页Technology of Water Treatment

基　　金：国家“十三五”水体污染控制与治理科技重大专项(2017ZX07603-004-02)。

摘　　要：受金属氧化物催化臭氧氧化氨氮的启发,对O_(3)/CaO_(2)氧化低浓度氨氮技术展开研究。实验结果表明,O_(3)/CaO_(2)共同完成了氨氮的协同氧化,降解效果与·OH密不可分;处理质量浓度为10 mg/L的氨氮时,CaO_(2)的最佳投加量为80 mg/L;pH对O_(3)/CaO_(2)体系氧化氨氮有较大影响,在最佳投加量下不会造成水体pH超标;适宜的反应时间为15 min,此时氨氮去除率达94.87%;氨氮的降解产物与Cl-和pH有关,硝态氮是主要的降解产物;作用机制可能为O_(3)在碱性条件下的直接氧化和·OH自由基氧化两种机制,·OH自由基的数量增多及其消耗速率加快可能是其用量、反应时间都优于常用的金属氧化物体系的原因。O_(3)/CaO_(2)协同氧化技术有望适用于一些需要对氨氮进行快速氧化的场合,具有广阔的应用前景。Inspired by the catalytic ozonation of ammonia nitrogen by metal oxides,the technology of low concentration ammonia nitrogen oxidation by O_(3)/CaO_(2) was studied.The experimental results showed that ammonia nitrogen was co-oxidized by O_(3)/CaO_(2) system,and the degradation effect was closely related to·OH.When the concentration of ammonia nitrogen was 10mg/L,the optimal dosage of CaO_(2) was 80 mg/L.pH had a great influence on O_(3)/CaO_(2) co-oxidation system,and the water pH will not exceed the standard under the optimal dosage.The appropriate reaction time was 15 min,and the removal rate of ammonia nitrogen was 94.87%.The degradation products of ammonia nitrogen were related to Cl-and pH value,nitrate nitrogen was the main degradation product.The probable mechanism was the direct oxidation of O_(3) under alkaline conditions and the oxidation by·OH radical.The increased number of·OH radical and its accelerated consumption rate may be the reason why the dosage and reaction time were better than the commonly used metal oxide systems.O_(3)/CaO_(2) co-oxidation technology is expected to be applicable to some situations where ammonia nitrogen needs to be oxidized quickly,and has a broad application prospect.

关 键 词：黑臭水体 O_(3) CaO_(2) 氨氮 协同氧化 

分 类 号：X703[环境科学与工程—环境工程]