Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China.
Key Laboratory of Water Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100123, China.
Bioresour Technol. 2019 Jan;272:370-378. doi: 10.1016/j.biortech.2018.10.046. Epub 2018 Oct 21.
Aerobic granular sludge was cultivated in three column reactors, which had been operated for 120 days under different feast/famine ratio (1:7, 1:11, 1:15). The composition of total bacteria was analyzed by testing oxygen uptake rates of mixed liquor samples taken from the reactors and calculating according to activated sludge model. The results revealed that long famine phase favored the growth of heterotrophic bacteria. The heterotrophic bacteria accounts for 49.80, 53.37, 91.39% of total bacteria respectively in R, R and R. The heterotrophic nitrification was also observed in all the reactors, which accounts for 58.62, 58.33, 61.54% of total nitrification respectively in R, R and R. A novel nitrogen-removal pathway involving simultaneous nitrification-denitrification by heterotrophic nitrification bacteria was proposed. The results revealed that microbial system consisted of heterotrophic ammonia oxidizing bacteria showed stronger capacity of simultaneous nitrification-denitrification.
采用三柱式反应器培养好氧颗粒污泥，在不同的饥饿/富养比（1:7、1:11、1:15）条件下运行 120 天。通过测试反应器中混合液样品的耗氧速率并根据活性污泥模型进行计算，分析了总细菌的组成。结果表明，长饥饿阶段有利于异养细菌的生长。在 R、R 和 R 中，异养菌分别占总细菌的 49.80%、53.37%和 91.39%。所有反应器中均观察到异养硝化作用，在 R、R 和 R 中，异养硝化分别占总硝化作用的 58.62%、58.33%和 61.54%。提出了一种涉及异养硝化细菌同时硝化-反硝化的新型脱氮途径。结果表明，由异养氨氧化细菌组成的微生物系统具有更强的同时硝化-反硝化能力。
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