不同溶解氧环境下氨氧化菌的氧半饱和常数比较  

Oxygen Half-saturation Constants of Ammonia Oxidizing Bacteria (AOB) in Nitrification Sludge under Different Dissolved Oxygen

作　　者：杨庆[1] 杨玉兵 刘秀红[1] 黄斯婷[1] 周薛扬 李健敏[1] 

机构地区：[1]北京工业大学城镇污水深度处理与资源化利用技术国家工程实验室,北京100124

出　　处：《中国给水排水》2017年第23期22-26,共5页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51508561);17科技创新服务能力建设--智能制造领域大科研计划项目;北京市优秀人才培养资助计划项目

摘　　要：为了研究溶解氧(DO)浓度对实现短程硝化的影响,在小试反应器内研究了长期不同溶解氧环境下稳定运行的硝化污泥中氨氧化菌(AOB)的氧半饱和常数(K_(O2,AOB))。结果表明,长期在DO为(0.5±0.1)mg/L条件下运行的硝化污泥中AOB的K_(O2,AOB)值为(0.281±0.026)mg O_2/L,长期在DO为(2.5±0.5)mg/L条件下运行的硝化污泥中AOB的K_(O2,AOB)值为(0.064±0.008)mg O_2/L,表明其AOB对氧具有极高的亲和力,并且在高DO浓度下,可以维持较高的比氨氧化速率。两个系统的K_(O2,AOB)值均较低,说明无论低DO或高DO浓度,均可能实现短程硝化,且在高DO浓度下更容易实现短程硝化。In order to study the effect of dissolved oxygen （DO） concentration on partial nitrifica- tion, the oxygen half-saturation constants of AOB in nitrification sludge were studied in a small-scale re- actor under long-term dissolved oxygen conditions. The results showed that Ko2,AOS of nitrification sludge was （0. 281 ＋0. 026） mgO2/L under long-term low DO of （0.5 -＋0.1 ） mg/L. While the value of AOB was （0. 064 ~ 0. 008） mgO2/L under long-term high DO of （2.5 -＋ 0.5 ） rag/L, indicating that the AOB had a high affinity for oxygen, and it could maintain a relatively high ammonia oxidation rate in the high DO environment. The Ko2 ,AOS values of the two systems were low, indicating that both low and high DO conditions were likely to achieve partial nitrification, and it was easier to achieve partial nitrification under high DO conditions.

关 键 词：短程脱氮 硝化污泥 氨氧化菌 氧半饱和常数 溶解氧 

分 类 号：X703[环境科学与工程—环境工程]