Journal
BIORESOURCE TECHNOLOGY
Volume 270, Issue -, Pages 570-579Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.08.124
Keywords
Mainstream; Anammox; Endogenous partial denitrification; Sewage; Advanced nitrogen removal
Funding
- Natural Science Foundation of China [21677005]
- 111 Project [D16003]
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Successful application of mainstream anammox would be favorable for energy-and resource-efficient sewage treatment. This study presents a new strategy to achieve mainstream anammox, which combined with endogenous partial denitrification (EPD) for treating sewage wastewater. In this EPD-Anammox system, nitrite was stably produced by EPD with a nitrate-to-nitrite transformation ratio of 80%. Through adjusting the volume exchange ratio of EPD-reactor after anaerobic reaction, a suitable NO2--N/NH4+-N ratio of similar to 1.20 for anammox reaction was achieved. Further, results showed a stable, high nitrogen removal efficiency (90%) with an effluent total nitrogen of 5.8 mg N/L under low C/N (similar to 2.9). Anammox contributed 49.8% of the overall nitrogen removal owing to the steady nitrite supply from EPD. Denitrifying glycogen-accumulating organisms (GAOs, 36.6%) having potential for endogenous denitrification and Candidatus Brocadia (34.6%) were respectively dominated in the EPD-SBR and anammox-UASB and responsible for the high nitrite accumulation and anammox reaction.
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