不同C/N值对低氨氮污水短程硝化的影响  

Effect of Different C/N Ratios on Partial Nitrification of Low Ammonia Nitrogen Wastewater

作　　者：徐浩 李捷 罗凡 李浩 于翔 XU Hao;LI Jie;LUO Fan;LI Hao;YU Xiang(Guangzhou Municipal Engineering Design and Research Insititute Co.Ltd.,Guangzhou 510060,China;Guangdong Shouhui Lantian Engineering Technology Co.Ltd.,Guangzhou 510075,China)

机构地区：[1]广州市市政工程设计研究总院有限公司,广东广州510060 [2]广东首汇蓝天科技有限公司,广东广州510075

出　　处：《中国给水排水》2021年第11期24-27,35,共5页China Water & Wastewater

基　　金：广州市越秀区科技计划项目(2019-GX-002);广州市市政工程设计研究总院有限公司企业项目(KY-2020-010)。

摘　　要：为了考察碳源对低氨氮污水短程硝化的影响,采用序批式反应器(SBR),在水温为(30±1)℃、pH值为7.8~8.2、DO为0.5~1.0 mg/L条件下,成功驯化出稳定运行的短程硝化系统,并研究了不同碳氮比(C/N)对短程硝化系统的影响,同时对各条件下系统的菌种变化进行了定量分析。结果表明,随着原水COD浓度的增加,短程硝化效果受到的影响增大,氨氮去除率和亚硝态氮积累率呈现下降趋势。当原水C/N值≤1.0时,COD浓度不会对短程硝化系统造成明显影响;但是,当原水C/N值增大到2.0和3.0时,氨氮去除率分别仅为82.8%、71.58%,氨氧化菌(AOB)和亚硝酸盐氧化菌(NOB)的比例从38.1∶1降到11.5∶1,短程硝化受到严重影响,系统趋于崩溃。碳源浓度的增加对短程硝化系统逐步产生抑制作用,实际运行中应控制C/N值不大于1.0。To investigate the effect of carbon source on partial nitrification,a stable partial nitrification system was successfully established in a sequencing batch reactor(SBR)with water temperature of(30±1)℃,pH of 7.8-8.2 and DO of 0.5-1.0 mg/L,effects of different C/N ratios on the partial nitrification system were explored,and the variation of microbial species in the partial nitrification system under different conditions were quantitatively analyzed.Increasing COD in the raw water would lead to a more obvious impact on the partial nitrification performance,and ammonia nitrogen removal efficiency and nitrite accumulation rate showed decreasing trends.When C/N ratio of the raw water was no more than 1.0,it had no obvious impact on the partial nitrification system.However,the removal rates of ammonia nitrogen were only 82.8%and 71.58%,and the ratio of AOB/NOB decreased from 38.1∶1 to 11.5∶1 when C/N ratio of the raw water was increased to 2.0 and 3.0,indicating that the partial nitrification process was severely affected and tended to collapse.The increase of carbon source concentration gradually inhibited the stable operation of the partial nitrification system,so the C/N ratio should be controlled no more than 1.0 in actual operation.

关 键 词：低氨氮污水 短程硝化 碳源 碳氮比(C/N) 氨氧化菌(AOB) 

分 类 号：TU992[建筑科学—市政工程]