Journal
BIORESOURCE TECHNOLOGY
Volume 361, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127693
Keywords
Deteriorated partial nitrification; Mainstream anammox; Nitrogen removal; Partial denitrification coupling anammox
Funding
- Key Program of National Natural Science Foundation of China [52131004]
- Higher Education Discipline Innovation Project (111 Project) [D16003]
- Funding Projects of Beijing Municipal Commission of Education
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This study used a novel continuous push-flow anaerobic-oxic-anoxic-oxic (AOAO) process to rapidly restore nitrogen elimination performance under deteriorated partial nitrification. The study also found that endogenous partial denitrification coupled with anammox in the anoxic zone is crucial for maintaining stable nitrogen removal.
The collapse of mainstream anammox system caused by deterioration of partial nitrification (PN) is easy to occur and it is vital to quickly restore the stable nitrogen elimination performance. Herein, a novel continuous push-flow anaerobic-oxic-anoxic-oxic (AOAO) process treating sewage was used to restore the nitrogen elimination performance rapidly under deteriorated PN. The increased abundances of Nitrospira and Candidatus Nitrotoga was responsible for the deterioration of PN. Effluent total inorganic nitrogen of 8.7 mg N/L and a stable nitrogen removal rate of 0.083 kg N/m(3).d were obtained with the aerobic hydraulic retention time (HRT) of 3.75 h even PN deteriorated. Endogenous partial denitrification coupled anammox in the anoxic zone was essential to maintain stable nitrogen removal under the deterioration of PN and the anammox contribution increased from 17.2 % to 23.6 %. The AOAO system shows robustness on nitrogen removal even PN deteriorated under the decrease of HRT from 16 to 12 h.
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