A/A/O氧化沟中DO对SND脱氮的影响研究  

Effect of DO on Simultaneous Nitrification and Denitrification in A/A/O Oxidation Ditch

作　　者：李柏林[1,2] 章文琴[1] 张智[2] 李晔[1] 陈杰云[2,3] 宋梦婷 

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [3]重庆市渝北区市政管理局,重庆401120

出　　处：《中国给水排水》2014年第19期80-83,共4页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07104-002);武汉市科技计划项目(2014060101010065);武汉理工大学自主创新基金资助项目(2013-Ⅳ-081);三峡库区生态环境教育部重点实验室开放基金资助项目(KLTG2013-02)

摘　　要：采用A／A／O氧化沟反应器处理低碳源城市污水，考察了DO浓度对硝化及反硝化过程的影响，分析DO浓度与同步硝化反硝化（SND）脱氮反应速率的关联性。研究发现，较适宜的DO浓度范围为1．0～1．5mg／L，DO浓度降低会影响氨氮降解，硝化效果急剧变坏的临界溶解氧浓度范围为O．8～1．5ms／L，而DO浓度过高则不利于主反应区SND脱氮，同时较多的溶解氧内回流至缺氧区会破坏其脱氮环境。当DO〈2．0mg／L时，NO^-3 -N生成速率与NH^4＋-N氧化速率之比与DO之间线性关系较好；SND随着DO浓度的升高而受到抑制，当DO〉2．0ms／L时，NO-^3-N生成速率与NH^＋4-N氧化速率之比与DO之间基本不呈线性关系，系统中基本不发生SND反应。The influence of DO concentration changes on nitrification and denitrification process was investigated in an A/A/O oxidation ditch bioreactor treating the low carbon municipal sewage, and the relationship between DO concentration and SND reaction rate was analyzed. The research results showed that the suitable range of DO was 1.0 to 1.5 mg/L. The reduction of DO concentration could af- fect the degradation of ammonia nitrogen, and the critical DO concentration for sharp deterioration of ni- trification was in the range of 0.8 to 1.5 mg/L. High DO concentration was not conducive to nitrogen re- moval by SND in the main reaction zone, while more DO recycled to the anoxic zone would destroy the denitrification environment. When DO was less than 2.0 mg/L, there was a good linear relationship be- tween the ratio of NO3^- - N formation rate to NH4＋^ - N oxidation rate and DO, and this showed that SND was suppressed with the DO concentration increased. But when DO was more than 2.0 mg/L, there was no linear relationship between the ratio of NO3^- - N formation rate to NH4^＋ - N oxidation rate and DO, and this meant that the SND reaction did not occur in the reactor system basically.

关 键 词：A/A/O氧化沟 溶解氧 脱氮 同步硝化反硝化 

分 类 号：X703[环境科学与工程—环境工程]