National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
Bioresour Technol. 2022 Feb;346:126520. doi: 10.1016/j.biortech.2021.126520. Epub 2021 Dec 9.
A continuous-flow anaerobic/aerobic/anoxic reactor with complete suspended activated sludge using sludge alkaline fermentation products as carbon source was utilized to strengthen nitrogen removal performance for low C/N ratio (<4) wastewater. Long-time performance indicated that the nitrite accumulation rate reached 60.40%, which strengthened the contribution of anammox. The average total inorganic nitrogen removal efficiency improved 19.40%. The abundance of ammonia oxidizing bacteria has not changed, but the abundance of nitrite oxidizing bacteria reduced from 5.79% to 0.69%. Quantitative PCR results demonstrated that the abundance of anammox bacteria has raised by 80.5 times. These results indicated that side-stream sludge alkaline fermentation promoted the mainstream partial nitrification, consequently accelerating the in-situ enrichment of anammox bacteria. No external carbon source dosing and short oxic hydraulic retention time (5.3 h) save energy and reduce consumption significantly in this system.
采用连续流厌氧/好氧/缺氧反应器，以污泥碱性发酵产物作为碳源，强化对低 C/N 比（<4）废水的脱氮性能。长期运行结果表明，亚硝酸盐积累率达到 60.40%，增强了厌氧氨氧化的贡献。平均总无机氮去除效率提高了 19.40%。氨氧化细菌的丰度没有变化，但亚硝化细菌的丰度从 5.79%降低到 0.69%。定量 PCR 结果表明，厌氧氨氧化菌的丰度提高了 80.5 倍。这些结果表明，侧流污泥碱性发酵促进了主流部分硝化，从而加速了厌氧氨氧化菌的原位富集。该系统无需投加外部碳源，好氧水力停留时间较短（5.3 h），显著节省了能源和消耗。
