A/O双污泥工艺脱氮性能  

Nitrogen removal performance of A/O process with two-sludge system

作　　者：韦皓天 岳学海 谭浩 刘鸿[2,3] 殷逢俊[2,3] WEI Haotian;YUE Xuehai;TAN Hao;LIU Hong;YIN Fengjun(The College of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Chongqing School,University of Chinese Academy Sciences,Chongqing 400020,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]中国科学院重庆绿色智能技术研究院,重庆400714 [3]中国科学院重庆学院,重庆400020

出　　处：《环境工程学报》2024年第3期799-807,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金面上项目(52170059)。

摘　　要：针对传统A/O(anaerobic/oxic)工艺中反硝化细菌对有机物的利用效率低、A_(2)N(anaerobic/anoxic-nitrification)工艺工序繁琐和出水氨氮浓度较高的问题,提出了一种泥水分离反应器,将双污泥体系与A/O工艺结合构建A/O双污泥工艺。对工艺运行过程的脱氮性能、微生物群落变化及氮素转化规律进行了研究,根据研究结果评估泥水分离反应器和A/O双污泥工艺在实际应用中的开发潜力,并总结工艺和反应器需要优化的问题,提出解决问题的思路。结果表明:在进水氮负荷为0.11 kg·(m^(3)·d)^(-1)条件下,工艺的氮去除负荷可以达到0.089 kg·(m^(3)·d)^(-1),NH_(4)^(+)-N去除率超过95%、COD去除率超过90%,TN去除率达到80%以上,该工艺能够实现长期稳定运行。反硝化过程反应速率是提升A/O双污泥工艺脱氮效率的限速步骤,强化有机物在缺氧池中的接触停留是有机物利用率提高的关键。因此,需要对现有碳源的投加方式、污水的进水方式或工艺的反应器数量进行优化,进一步提高工艺对碳源的利用效率。微生物群落结构表明陶厄氏菌(Thauera)、硝化螺杆菌(Nitrospira)、Caldilineaceae等硝化反硝化功能菌属与主导异养硝化-好氧反硝化过程的副球菌(Paracoccus)共同协作是维持高NH4+-N去除率和TN去除率的原因之一。综上所述,A/O双污泥工艺具有良好的脱氮性能,具备实际应用价值,同时该研究结果可为工艺及反应器存在的缺陷进行后续优化研究提供参考。To address the low utilization efficiency of organic matter by denitrifying bacteria in traditional A/O processes,the complexity of A_(2)N(anaerobic/anoxic-nitrification)process steps,and the high concentration of effluent ammonia nitrogen,a sludge-water separation reactor was proposed.The two-sludge system and A/O process were combined to build the A/O two-sludge process to tackle these challenges.The denitrification performance,variations in microbial communities,and nitrogen transformation patterns during the process operation were studied,the development potential of the sludge-water separation reactor and the A/O two-sludge process based on the research results were evaluated.Additionally,the issues that require optimization in both the process and reactors were summarized and the strategies to address these challenges were raised.The result showed that at an influent nitrogen loading of 0.11 kg·(m^(3)·d)^(−1),the nitrogen removal load of the process could reach 0.089 kg·(m^(3)·d)^(−1).The NH_(4)^(+)-N removal efficiency exceeded 95%,COD removal rate surpassed 90%,and TN removal rate exceeded 80%,which could ensure the long-term stable operation of systems.Analysis of the nitrogen transformation patterns indicates that the reaction rate of the denitrification process was the limiting factor in improving the denitrification efficiency of A/O two-sludge process.Increasing the contact time of organic matter in the anoxic tank was crucial for improving the organic matter utilization rates.Therefore,it is necessary to optimize the current carbon source addition method,influent mode,or the number of reactors in the process for further increasing the process efficiency in utilizing carbon sources.The microbial community structure suggests that the cooperative action of denitrifying bacteria,such as Thauera,Nitrospira,Caldilineaceae,along with the predominant heterotrophic nitrification-aerobic denitrification bacterium Paracoccus,was the key factor in maintaining high removal efficiencies of NH_(4)^(+)-N an

关 键 词：A/O双污泥工艺 泥水分离 脱氮性能 内循环 

分 类 号：X703.1[环境科学与工程—环境工程]