1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; 2. National and Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China; 3. Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou University of Science and Technology, Suzhou 215009, China
Abstract：The key conditions and inhibition mechanism in nitrification process were analysed by using different sludge sources and anoxic/aerobic ratios of intermittent aeration process under mainstream conditions. The results showed that nitrite accumulation was difficult to obtain in partial nitrification system relying only under low-dissolve oxygen (DO) and intermittent aeration. When coupled with anammox process, NO3--N concentration in effluent decreased from 41.64mg/L to 11.54mg/L under the same NH4+-N conversion environment, and the nitrification process was significantly inhibited. The quantitative analysis shows that Nitrate-oxidizing bacteria (NOB) had strong adaptability in the environment of low-DO and intermittent aeration, with a maximum increase of 2.9 times after 15days of operation, while in a mixed system with anammox bacteria, the maximum increase was only 1.4 times. The results of microbial community structure change showed that in low DO coupled intermittent aeration environment, the abundance of NOB inoculated in mixed sludge system increased faster than that in nitrification sludge system. Therefore, strengthening nitrite utilization and reducing its exposure concentration in aerobic stage is a key condition for achieving NOB inhibition in intermittent aeration process.
谢怡漪, 李祥, 袁怡, 许佩玲, 黄勇, 吴鹏. 主流条件下间歇曝气抑制NOB与微生物动态响应[J]. 中国环境科学, 2023, 43(9): 4616-4625.
XIE Yi-yi, LI Xiang, YUAN Yi, XU Pei-ling, HUANG Yong, WU Peng. The way of coupling intermittent aeration strategy to inhibit NOB activity in mainstream environment and the dynamic response of microorganisms. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4616-4625.
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