低C/N比CANON工艺脱氮机制分析  

Nitrogen Removal Mechanism Analysis of CANON Process at Low C/N

作　　者：田亮 黄锐 杜冬云 吴晨捷[1,2] TIAN Liang;HUANG Rui;DU Dongyun;WU Chenjie(Hubei Engineering and Technology Research Center for Heavy Metal Pollution Prevention and Control,College of Resources and Environmental Science,South-Central Minzu University,Wuhan 430074,China;Key Laboratory of Catalytic Transformation and Energy Materials Chemistry of Ministry of Education,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]中南民族大学资源与环境学院,湖北省重金属污染防治工程技术研究中心,湖北武汉430074 [2]中南民族大学催化转化与能源材料化学教育部重点实验室,湖北武汉430074

出　　处：《环境科学与技术》2023年第10期104-111,共8页Environmental Science & Technology

基　　金：中南民族大学中央高校基本科研业务费项目(CZQ23014);武汉市科技成果转化项目(202003603012341)。

摘　　要：该文在微氧升流反应器中构建颗粒-絮体污泥体系,以乙酸钠作为碳源,探究了C/N对CANON工艺脱氮效率的影响,并分析了低C/N下该工艺的脱氮机制。当C/N=0.75时,TN和NH_(4)^(+)-N去除率达到了最高值92%和95%。而当C/N从0.75增长至1时,TN和NH_(4)^(+)-N去除率分别下降至80%和85%;C/N回调至0.75后,10 d左右反应器性能恢复至91%TN去除率。C/N=0.75时脱氮贡献分析和粒度分布表明AnAOB对NO_(2)^(-)-N的摄取处于优势地位,反应器内主要发生Anammox反应和短程反硝化反应,合适的C/N并不会导致异养菌取代AnAOB的优势地位,且Anammox反应的脱氮贡献在56%~62%之间。In this study,a granular-flocculent sludge system was established in a micro-oxygen upflow reactor.The effects of C/N on nitrogen removal performance and its relating nitrogen removal mechanism for the CANON process were analyzed using sodium acetate as carbon source.The highest TN and NH_(4)^(+)-N removal efficiencies of 92%and 95%were achieved at C/N=0.75.When C/N increased from 0.75 to 1,TN and NH_(4)^(+)-N removal efficiencies decreased to 80%and 85%,respectively.After C/N was reset to 0.75,TN removal efficiency recovered to about 91%within 10 d.The nitrogen removal pathway analysis and particle size distribution at C/N=0.75 showed that AnAOB were in a dominant position for NO_(2)^(-)-N uptake.Anammox and partial denitrification reactions mainly occurred in the reactor.Appropriate C/N did not cause heterotro⁃phic bacteria to overgrow and replace AnAOB and the contribution of anammox reaction for nitrogen removal was in the range of 56%~62%.

关 键 词：微氧升流反应器 CANON工艺 颗粒-絮体污泥 脱氮机制 低C/N 

分 类 号：X703[环境科学与工程—环境工程]