Journal
BIORESOURCE TECHNOLOGY
Volume 312, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123590
Keywords
Low temperatures; Anammox process; Municipal wastewater; Undulating seasonal temperature variation; Ca. Brocadia
Funding
- R&D Program of Beijing Municipal Education Commission
- National Natural Science Foundation of China [21806006]
- Beijing Municipal Commission of Education
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In the anammox process treating low-strength municipal wastewater, the effect of common seasonal temperature variation (15.1 degrees C-22.2 degrees C) on performance was studied. In autumn and winter, the nitrogen removal rate (NRR) decrement of 0.038kgN/(m(3).d) (17.9 degrees C -> 15.1 degrees C) was nearly threefold higher than 0.014kgN/(m(3).d) (22.2 degrees C -> 17.9 degrees C), which showed that lower temperature laid more negative impact on nitrogen removal. N-15 isotope tracing tests confirmed that the contribution of denitrification to nitrogen removal was far less than anammox, and anammox contributed more at 15.1 degrees C (91.7%) than 21.9 degrees 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(4)(+)-N/(gVSS.h) indicated the recovered removal capacity.
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