HRT对多级A/O耦合流离生化工艺低温脱氮的影响  

Effect of Hydraulic Retention Time on Multistage A/O Coupled with Flow-separated Biochemical Process for Nitrogen Removal from Wastewater at Low Temperature

作　　者：王帆[1] 李军[2] 艾胜书[1] 康华[1] 聂泽兵 边德军[1,3] WANG Fan;LI Jun;AI Sheng-shu;KANG Hua;NIE Ze-bing;BIAN De-jun(Jilin Key Laboratory of Urban Sewage Treatment,Changchun Institute of Technology,Changchun 130012,China;College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Science and Technology Innovation Center for Municipal Wastewater Treatment and Water Quality Protection,Northeast Normal University,Changchun 130117,China)

机构地区：[1]长春工程学院吉林省城市污水处理重点实验室,吉林长春130012 [2]北京工业大学建筑工程学院,北京100124 [3]东北师范大学吉林省城市污水处理与水质保障科技创新中心,吉林长春130117

出　　处：《中国给水排水》2022年第17期74-80,共7页China Water & Wastewater

基　　金：吉林省科技发展计划项目(YDZJ202201ZYTS638)。

摘　　要：为探究低温下水力停留时间(HRT)对三级A/O耦合流离生化工艺脱氮的影响,选用流离球作为生物膜载体,控制温度为(10±1)℃、进水流量分配比为25∶15∶6、总曝气量为6 L/min、污泥龄为43 d、污泥回流比为50%,考察HRT分别为12、8、6 h时的运行效果。结果表明,HRT为8 h时脱氮效果最好,COD、NH_(4)^(+)-N和TN平均去除率分别为84.98%、92.03%和68.52%。分析生化系统各级脱氮效果可知,HRT为6 h时,硝化反应是制约耦合工艺低温高效脱氮的关键因素;HRT为12 h时不利于提高微生物活性,TN去除率较低且去除效果不稳定。研究结果丰富了多级A/O耦合工艺低温脱氮理论,同时可为工程设计应用提供参考。The effect of hydraulic retention time(HRT)on three-stage A/O coupled with flow-separated biochemical process for nitrogen removal at low temperature was explored.The performances of the process operated with HRT of 12 h,8 h and 6 h were investigated respectively,and other operational conditions were as follows:flow-separated ball as the biofilm carrier,temperature of(10±1)℃,influent flow distribution ratio of 25∶15∶6,total aeration rate of 6 L/min,sludge retention time of 43 days and sludge reflux ratio of 50%.When HRT was 8 h,the denitrification performance was the best,and the average removal rates of COD,NH_(4)^(+)-N and TN were 84.98%,92.03%and 68.52%,respectively.The denitrification performances of different stage biochemical systems indicated that nitrification was the key factor restricting high-efficiency denitrification of the coupling process at low-temperature when HRT was 6 h.HRT of 12 h was not conducive to the improvement of microbial activity,and the TN removal rate was low and unstable.The paper enriches the theory of nitrogen removal in multistage A/O coupling processes at low temperature,and can provide reference for engineering design and application.

关 键 词：水力停留时间 多级A/O工艺 低温 脱氮 同步硝化反硝化 生物膜 

分 类 号：TU992[建筑科学—市政工程]