回流液反硝化状态转变及脱氮效果提升研究  

Study on the Transformation of Denitrification Status of Reflux and Improvement of Denitrification Effect

作　　者：薛青 袁林江[1,2,3] 杨睿 朱淼[1,2,3] 周旭红 贺向峰 XUE Qing;YUAN Linjiang;YANG Rui;ZHU Miao;ZHOU Xuhong;HE Xiangfeng(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Northwest Water Resource,Environment and Ecology of Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China;Shaanxi Key Laboratory of Environmental Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安建筑科技大学西北水资源与环境生态教育部重点实验室,陕西西安710055 [3]西安建筑科技大学陕西省环境工程重点实验室,陕西西安710055

出　　处：《环境科学与技术》2023年第3期149-157,共9页Environmental Science & Technology

基　　金：国家自然科学基金面上项目(50878180)。

摘　　要：为探究工艺特性对硝化混合液液相主体及其中污泥分别从有氧、好氧呼吸状态转变为无氧、反硝化状态的影响。该文在A/O系统中研究了不同DO条件下,内回流液从好氧硝化状态转变为缺氧反硝化状态过程中液相主体物质及反硝化速率的变化,以及在不改变HRT及其他条件的情况下,在A/O系统上分别增设前置预反硝化池、后置预沉淀池,且好氧池均改用渐减曝气法,探究对系统脱氮效果的影响及氮的去除途径。结果表明:在保证充分硝化下,相对好氧池溶解氧较低时,无论回流液液相主体还是污泥的状态转变都较快,污泥反硝化速率在短时间内迅速提升;增设前置预反硝化池或后置预沉淀池可以将系统的脱氮效率从79%分别提高至83%和89%,且后置预沉淀池改善了沉淀池的污泥沉降性能。好氧池采用渐减曝气,系统脱氮率也会有所提高,无论是后置预沉淀池还是前置预反硝化池,都使好氧混合液中污泥快速转变为反硝化状态,提高了缺氧池污泥反硝化速率以及系统脱氮效率。In order to explore the effect of process characteristics on the liquid phase main body of nitrification mixed liquor and the sludge in it,from aerobic and aerobic respiration states to anaerobic and denitrifying states,respectively,in the A/O system,the changes of the main substance and the denitrification rate of the liquid phase in the process of changing the internal reflux liquid from aerobic nitrification state to anoxic denitrification state under different DO conditions were studied.In this case,a pre-denitrification tank and a post-precipitation sedimentation tank were added to the A/O system,respectively,and the aerobic tank was changed to a gradually decreasing aeration method to explore the impact on the denitrification effect of the system and the removal of nitrogen.The results show that under the condition of ensuring sufficient nitrification,when the dissolved oxygen in the relative aerobic tank is low,no matter the liquid phase main body of the reflux liquid or the state of the sludge changes rapidly,the denitrification rate of the sludge increases rapidly in a short time.The denitrification efficiency of the system can be increased from 79%to 83%and 89%by installing a pre-denitrification tank or a post-precipitation tank,and the post-pre-sedimentation tank improves the sludge settling performance of the sedimentation tank.The aerobic tank adopts gradually reduced aeration,and the denitrification rate of the system will also be improved.Whether it is the post pre-sedimentation tank or the pre-denitrification tank,the sludge in the aerobic mixed solution is rapidly transformed into the denitrification state,which improves the denitrification rate of the sludge in the anoxic tank and the denitrification efficiency of the system.

关 键 词：污水生物脱氮 活性污泥 反硝化作用 混合液回流 

分 类 号：X703[环境科学与工程—环境工程]