厌氧/好氧/缺氧SBBR工艺脱氮效果及N2O的释放特征  

Characteristics of nitrogen removal and nitrous oxide emission in an anaerobic/oxic/anoxic SBBR

作　　者：葛光环 寇坤 赵剑强[3] 储玖琳 GE Guang-huan;KOU Kun;ZHAO Jian-qiang;CHU Jiu-lin(School of Tourism and Environment,Ankang University,An-kang725000,Shaanxi,China;Engineering Technology Research Centerfor Water Resource Protection and Utilizationof Hanjiang River,Shaannan Eco-Economy Research Center,Collaborative Innovation Center for Qinba Land and Resources Utilization and Environment Protection,Ankang 725000,Shaanxi,China;School of Environmental Science and Engineering,Chang’an University,Xian710054,China)

机构地区：[1]安康学院旅游与资源环境学院,陕西安康725000 [2]安康市汉江水资源保护与利用工程技术研究中心,陕南生态经济研究中心,秦巴国土资源利用与环境保护协同创新中心,陕西安康725000 [3]长安大学环境科学与工程学院,西安710054

出　　处：《安全与环境学报》2019年第6期2144-2149,共6页Journal of Safety and Environment

基　　金：安康学院高层次人才科研启动项目(2018247);国家级大学生创新创业训练计划项目;陕西省教育厅自然科学研究项目(19JK0015)

摘　　要：为了研究厌氧/好氧/缺氧(A/O/A) SBBR处理低碳氮比污水的脱氮效果和N2O的释放特征,通过控制溶解氧浓度和曝气时间使系统在好氧阶段实现了亚硝酸盐型同步硝化反硝化,延长缺氧反应时间促进内源反硝化反应,在后置缺氧段无外加碳源条件下达到高效脱氮的效果。研究了亚硝酸盐型同步硝化反硝化和内源反硝化反应过程中均有温室气体N2O的释放现象发生,研究了A/O/A SBBR在处理含氮废水时各反应阶段中N2O的释放特征及释放原因。结果表明,在工艺稳定运行期间,A/O/A SBBR总氮去除率高达(95. 97±2. 85)%。好氧阶段短程硝化和后置缺氧段中,内源反硝化作用可降低系统的氧气需求量、节省碳源及减少污泥产量。在好氧运行阶段去除总氮占总去除氮量的(57. 62±4. 43)%,污水中氮主要通过亚硝酸盐型同步硝化反硝化作用去除;(39. 00±4. 07)%总氮在缺氧运行阶段去除,此阶段氮主要通过内源反硝化作用去除。其中,(15. 47±2. 65)%的总氮以N2O的形式释放,A/O/A SBBR脱氮过程中亚硝酸盐的累积和内源反硝化可刺激较多的N2O产生,而较多的N2O可作为能源进行回收利用。研究表明,A/O/A SBBR工艺在处理低碳氮比污水时具有克服传统工艺中反硝化碳源不足这一难题的潜力。The paper is engaged in examining and identifying the nitrogen removal effect and N2 O release features on the condition of the low carbon nitrogen ratio sewage treating through the anaerobic/aerobic/anoxic(A/O/A) SBBR processing. The aim is to achieve the simultaneous nitritation and denitritation by controlling the dissolved oxygen concentration rate and the aeration time via nitrite during the oxic period in the A/O/A SBBR. Since the endogenous denitrification reaction can be promoted by prolonging the anoxic reaction time,it would be possible for the efficiency of the total nitrogen(TN) to be heightened by improving the efficiency of the internal denitrification under the condition with no external carbon source interfered during the post anoxic period. And,since the greenhouse gas N2 O release may come about in the process of simultaneous nitrification and denitrification via the nitrite and endogenous denitrification,it would be possible for us to test and examinine the characteristic features of the N2 O release through experiments in each reaction stage of the A/O/A SBBR,which may account for the N2 O release to be analyzed in this paper. The results of our above study reveal that we have successfully obtained(95. 97 ± 2. 85) % of the TN removal efficiency in the A/O/A SBBR at the stable operational stage. Through the short cut nitrification in the aerobic stage and the endogenous denitrification in the post anoxic stage,it would be possible to reduce the oxygen demand,the carbon source saving and the sludge production,which can help to remove(57. 62± 4. 43) % of TN in the oxic phase. Of course,the nitrogen in the sewage can mainly be removed through simultaneous nitrification and denitrification via nitrite in the above stage. Furthermore,in the anoxic phase,it can also help to remove TN at a percentage of(39. 00 ± 4. 07) %. Besides,at this stage,the nitrogen can mainly be removed by way of internal denitrification,in helping to remove(15. 47 ± 2. 65) % of TN as N2 O. In addition,more N2 O production

关 键 词：环境工程学 厌氧/好氧/缺氧SBBR 亚硝酸盐型同步硝化反硝化 内源反硝化 氧化亚氮 

分 类 号：X703.1[环境科学与工程—环境工程]