National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China.
National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, China.
Bioresour Technol. 2020 Sep;312:123590. doi: 10.1016/j.biortech.2020.123590. Epub 2020 May 28.
In the anammox process treating low-strength municipal wastewater, the effect of common seasonal temperature variation (15.1 °C-22.2 °C) on performance was studied. In autumn and winter, the nitrogen removal rate (NRR) decrement of 0.038kgN/(m·d) (17.9 °C → 15.1 °C) was nearly threefold higher than 0.014kgN/(m·d) (22.2 °C → 17.9 °C), which showed that lower temperature laid more negative impact on nitrogen removal. N isotope tracing tests confirmed that the contribution of denitrification to nitrogen removal was far less than anammox, and anammox contributed more at 15.1 °C (91.7%) than 21.9 °C (78.9%). Anammox bacteria could adapt to lower temperature after short-term acclimatization, especially the dominant genus Ca. Brocadia increased from 1.8% to 2.5% and its abundance was significantly correlated with nitrogen consumption (p < 0.05). Above findings suggest that the adaptability of Ca. Brocadia could provide the possibility to maintain nitrogen removal performance at lower temperature. In spring, the improved maximum anammox activity from 2.85 to 3.23mgNH-N/(gVSS·h) indicated the recovered removal capacity.
在处理低强度市政废水的厌氧氨氧化工艺中，研究了常见季节性温度变化（15.1°C-22.2°C）对性能的影响。在秋季和冬季，氮去除率（NRR）的下降幅度（17.9°C→15.1°C）接近 0.038kgN/（m·d）的三倍，而 0.014kgN/（m·d）（22.2°C→17.9°C），这表明较低的温度对氮去除的负面影响更大。氮同位素示踪试验证实，反硝化对氮去除的贡献远小于厌氧氨氧化，在 15.1°C（91.7%）时厌氧氨氧化的贡献大于 21.9°C（78.9%）。厌氧氨氧化菌经过短期驯化后能够适应较低的温度，特别是优势属 Ca. Brocadia 从 1.8%增加到 2.5%，其丰度与氮消耗呈显著正相关（p<0.05）。这些发现表明，Ca. Brocadia 的适应性可能为在较低温度下维持氮去除性能提供了可能性。在春季，最大厌氧氨氧化活性从 2.85 提高到 3.23mgNH-N/（gVSS·h），表明去除能力得到了恢复。
