化学-生物还原联合法去除烟气中NO研究进展  

Recent advances in chemical-biological reduction combined technologies for nitric oxide removal from flue gas

作　　者：花宇真 彭淑婵 张代钧[1,2] 卢培利 朱砚涛[1] HUA Yuzhen;PENG Shuchan;ZHANG Daijun;LU Peili;ZHU Yantao(College of Environment and Ecology,Chongqing University,Chongqing 400044,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing 400044,China)

机构地区：[1]重庆大学环境与生态学院,重庆400044 [2]煤矿灾害动力学与控制国家重点实验室,重庆400044

出　　处：《应用与环境生物学报》2022年第5期1349-1356,共8页Chinese Journal of Applied and Environmental Biology

基　　金：重庆市留学回国人员创新创业支持计划(cx2019014);重庆市基础科学和前沿技术研究项目(cstc2017jcyjBX0042)资助。

摘　　要：烟气中氮氧化物(NO_(x))会形成酸雨并对人体健康产生危害,一氧化氮(NO)占烟气中NO_(x)的85%-90%,去除烟气中NO具有重要意义.在简要介绍典型的化学还原法、生物还原法的基础上,全面综述化学-生物还原联合法去除烟气中NO研究进展.首先重点阐述络合吸收耦合反硝化法以及络合吸收耦合厌氧氨氧化法的去除效率及其反应机理研究.其次归纳络合吸收耦合反硝化电极生物膜强化法和络合吸收耦合厌氧氨氧化的海绵铁强化法.进而总结化学-生物还原联合法去除NO的影响因素(pH、温度、氧气),为工艺参数设置提供参考.最后从NO去除率、反应器运行的稳定性以及反应产物3个方面对比分析络合吸收耦合反硝化与络合吸收耦合厌氧氨氧化工艺的优缺点:前者NO去除率较优,但需额外投加有机碳,有N_(2)O产生;后者NO去除率次之,但无需外加碳源、节省成本,无N_(2)O产生.未来,在工艺拓展应用方面,化学-生物还原联合法联合处理烟气中NO、汞、多环芳烃等污染物值得进一步研究;在机理研究方面,需要对Fe(II)EDTA被NO氧化为Fe(Ⅲ)EDTA的生物、化学氧化还原机理(如铁自养反硝化、化学反硝化等)进行深入研究.Nitrogen oxides(NO_(x))in flue gas can cause acid rain,which is harmful to human health.Nitric oxide(NO)accounts for 85%–90%of the total NO_(x) in flue gas;thus,removing NO from flue gas is of great significance.After briefly introducing classic chemical and biological reduction methods,we comprehensively reviewed the research progress of combined chemical–biological reduction methods to remove NO from flue gas.Firstly,the NO removal efficiency and reaction mechanisms of complex absorption coupled with denitrification and absorption coupled with anaerobic ammonium oxidation(Anammox)were discussed.Secondly,enhancement methods for improving the reduction efficiency of the adsorbent,including the electrode biofilm enhancement method for the complex absorption coupled with denitrification and sponge iron enhancement method for complex absorption coupled with Anammox,were summarized.Thirdly,the influencing factors(pH,temperature,and oxygen)of NO removal using the chemical–biological combined reduction method were analyzed to provide a reference for setting the process parameters.Finally,the advantages and disadvantages of complex absorption coupled with denitrification and absorption coupled with Anammox processes were compared using three aspects-NO removal rate,reactor operation stability,and reaction products.The results indicate that the performance of complex absorption coupled with denitrification for NO removal was significant,but it requires an external carbon source and can produce N_(2)O.Contradictorily,the performance of complex absorption coupled with Anammox was relatively poor,but it is a cost-effective method without an external carbon source requirement and does not produce N_(2)O.In the future,in terms of process development and application,the application of combined chemical–biological reduction methods to eliminate NO,mercury,and polycyclic aromatic hydrocarbons(PAHs)is worthy of further exploration.In terms of mechanism,the biological and chemical redox mechanisms of Fe(II)EDTA(iron autotr

关 键 词：络合吸收 反硝化 厌氧氨氧化 烟气脱硝 一氧化氮 

分 类 号：X701[环境科学与工程—环境工程]