Effect of dissolved oxygen on the stability and functional microbial communities of the partial nitrification
YANG Qing, YANG Yu-bing, YANG Zhong-qi, HUANG Si-ting, ZHOU Xue-yang, LIU Xiu-hong
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
The stability of partial nitrification at different dissolved oxygen (DO) concentration was studied in SBR at room temperature. Under the low DO concentration of 0.5mg/L, the partial nitrification kept stable for 75cycles with the nitrite accumulation rate (NAR) higher than 80%. Until 105cycles, the NAR gradually decreased and the partial nitrification transformed to the complete nitrification. However, using the same sludge, the partial nitrification kept long-term stable of 180cycles under the DO concentration of 2.5mg/L. Furthermore, NAR was higher than 90%. These results indicated under high DO concentration, the stable operation of partial nitrification can be maintained for a long period of time. The oxygen half saturation constant of AOB and NOB, and qPCR tests indicated that low DO might be benefit to the growth of Nitrospira that resulted in the unstable of the partial nitrification. Moreover, under high DO concentration, AOB had higher affinity for oxygen. Therefore, high oxygen concentration could maintain long-term stability of partial nitrification.
杨庆, 杨玉兵, 杨忠启, 黄斯婷, 周薛扬, 刘秀红. 溶解氧对短程硝化稳定性及功能菌群的影响[J]. 中国环境科学, 2018, 38(9): 3328-3334.
YANG Qing, YANG Yu-bing, YANG Zhong-qi, HUANG Si-ting, ZHOU Xue-yang, LIU Xiu-hong. Effect of dissolved oxygen on the stability and functional microbial communities of the partial nitrification. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(9): 3328-3334.
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