CRI系统亚硝化-厌氧氨氧化的启动调控及性能  

Nitrosation/Anaerobic Ammonia Oxidation of CRI Systems:Start-up,Regulation/Control and Performance

作　　者：陈佼 黄琴 李舒昕 刘芳颖 闫思羽 黄雯 陆一新[1] CHEN Jiao;HUANG Qin;LI Shuxin;LIU Fangying;YAN Siyu;HUANG Wen;LU Yixin(School of Materials and Environmental Engineering,Chengdu Technological University,Chengdu 611730,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]成都工业学院材料与环境工程学院,四川成都611730 [2]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《环境科学与技术》2024年第4期26-33,共8页Environmental Science & Technology

基　　金：国家自然科学基金项目(21705133);四川省科技计划项目(2022YFG0307,2022NSFSC0393);四川省大学生创新训练计划项目(S202311116054);成都工业学院校级项目(2022ZR001)。

摘　　要：为增强人工快速渗滤(CRI)系统对污水中氮素污染物的去除效果,作者分别构建了单级亚硝化CRI反应器(N-CRI)和厌氧氨氧化CRI反应器(A-CRI),探讨了其有效启动调控策略及耦合脱氮性能。结果表明,饥饿14 d后提高进水中NaCl质量浓度至4 g/L,可实现N-CRI反应器亚硝化的高效启动,NO_(2)^(-)-N积累率均值达到98.1%。通过逐步提高水力负荷至1.0 m/d的方式运行45 d后,A-CRI反应器可成功启动厌氧氨氧化,耦合后的N/A-CRI系统对污水中NH_(4)^(+)-N、TN的去除率均值分别达到98.5%、93.1%。菌群结构分析发现,N-CRI反应器内的主要氨氧化菌(AOB)类型为Nitrosomonas和Nitrosospira,主要亚硝酸盐氧化菌(NOB)类型为Nitrospira,饥饿协同NaCl调控可使NOB活性受抑而阻碍其进一步氧化NO_(2)^(-)-N;A-CRI反应器内的主要厌氧氨氧化菌(AAOB)类型为Candidatus Brocadia和Candidatus Kuenenia,其相对丰度的大幅增长为NH_(4)^(+)-N和NO_(2)^(-)-N的同步高效去除创造了条件,为CRI系统脱氮性能的增强提供了一条新途径。With the purpose of enhancing the removal of nitrogen pollutants from wastewater by the constructed rapid infiltration(CRI)system,a bench-scale experimental appratus,including a single-stage nitrosation CRI reactor(N-CRI)and an anaerobic ammonia oxidation CRI reactor(A-CRI),was erected to explore the effective start-up regulatory strategies and coupled nitrogen removal performance.The findings of the experiment with the reactors suggested that increasing the mass concentration of NaCl in the feed water up to 4 g/L,after starvation for 14 days an efficient start-up of nitrosation in the N-CRI reactor was realized with an average NO_(2)^(-)-N accumulation rate of 98.1%;and by gradually increasing the hydraulic load to 1.0 m/d,after 45-day operation anaerobic ammonia oxidation successfully start in the A-CRI reactor.When the N-CRI was coupled with A-CRI in series the wastewater treatment operation demonstrated the removal efficiency of NH_(4)^(+)-N could reach 98.5%,and TN 93.1%in average respectively.As to the structure of the bacterial community in the treatment system,the analysis revealed that the main species of ammonia-oxidizing bacteria(AOB)in the N-CRI reactor were Nitro-somonas and Nitrosospira,and the main NOB species was Nitrospira,and the starvation synergistic NaCl modulation could lead to the restriction of NOB activity and prevented it from further oxidizing NO_(2)^(-)-N;the main anaerobic ammonia-oxidiz-ing bacteria(AAOB)species in the A-CRI reactor mainly consisted of Candidatus Brocadia and Candidatus Kuenenia,whose enormous proliferation in relative abundance created conditions for the simultaneously high-efficient removal of NH_(4)^(+)-N and NO_(2)^(-)-N,providing a new pathway to enhance the nitrogen removal performance of the CRI system.

关 键 词：人工快速渗滤系统 亚硝化 厌氧氨氧化 启动 脱氮 

分 类 号：X703.1[环境科学与工程—环境工程]