曝气动力横向内循环反应器脱氮途径与性能分析  

Nitrogen removal pathway and performance analysis of aeration-power lateral internal-circulation reactor

作　　者：戴步峰[1] 乔冰闯 刘烨星 夏文林 王阿华[1] 于莉芳[2] DAI Bufeng;QIAO Bingchuang;LIU Yexing;XIA Wenlin;WANG Ahua;YU Lifang(Nanjing Municipal Design and Research Institute Co.Ltd.,Nanjing 210008,China;School of Municipal and Environmental Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]南京市市政设计研究院有限责任公司,南京210008 [2]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境工程学报》2023年第1期307-315,共9页Chinese Journal of Environmental Engineering

基　　金：陕西省教育厅重点科学研究计划项目(22JT024)。

摘　　要：为降低城市污水生物脱氮系统处理能耗、提高脱氮效率,使用一种新型曝气动力横向内循环反应器(ALIR)来处理模拟城市污水并对该反应器的脱氮途径与性能进行了研究,采用16S rRNA基因高通量测序技术对微生物群落结构进行了分析。结果表明:反应器在A/O比为1:1、水力停留时间为9 h、污泥龄为20 d、污泥回流比100%的条件下,连续运行90 d后,出水NH4+-N质量浓度低至(3.20±0.93) mg·L^(-1),平均去除率为92.29%,出水总氮(TN)质量浓度为(11.68±1.31) mg·L^(-1),TN去除率达到71.81%,同时好氧区平均同步硝化反硝化(SND)率达到26.49%;接种污泥与第80天活性污泥的优势门均为Proteobacteria和Bacteroidetes;与接种污泥相比,第80天污泥中Pseudomonas、 Sulfuritalea等反硝化菌属丰度呈下降趋势,具有好氧反硝化功能的Acinetobacter属和Hyphomicrobium属的丰度则明显增加。综上,实验条件下,曝气动力横向内循环反应器可以免除内回流能耗,并获得良好的脱氮效果。该研究结果可为内循环反应器在实际工程中的应用提供参考。In order to reduce the energy consumption and improve the nitrogen removal efficiency of biological nitrogen removal system for urban sewage, a new type of aeration-power lateral internal-circulation reactor(ALIR) was used to treat artificial urban sewage, and the nitrogen removal pathway and performance of the reactor was investigated. 16 S rRNA gene high-throughput sequencing technology was used to analyze microbial community structure. The results showed that at A/O ratio of 1:1, hydraulic retention time of 9 h,sludge age of 20 d and sludge return ratio of 100%, the effluent concentrations of ammonia and total nitrogen(TN) were as low as(3.20±0.93) mg·L^(-1)(92.29%, ammonia removal efficiency) and(11.68±1.31) mg·L^(-1)(71.81%, TN removal efficiency) after long-term operation for over 90 days, respectively, and the simultaneous nitrification and denitrification(SND) rate was 26.49%. The results of the high-throughput sequencing showed that the dominant phyla in the inoculated sludge and the activated sludge on the 80thday were Proteobacteria and Bacteroidetes. Compared with the inoculated sludge, the relative abundances of denitrifying bacteria in the activated sludge on the 80thday, such as Pseudomonas and Sulfuritalea, showed a decreasing tendency, while these of Acinetobacter and Hyphomicrobium with an aerobic denitrifying function increased significantly. Thus,the aeration dynamic transverse internal circulation reactor had a good nitrogen removal performance without the energy consumption of internal circulation under the experimental operating conditions. This will provide a reference for the application of this reactor in practical engineering.

关 键 词：曝气动力 内循环 脱氮 微生物群落结构 同步硝化反硝化 

分 类 号：X703[环境科学与工程—环境工程]