High-efficient nitrogen removal from municipal wastewater via two-stage nitritation/anammox process: Long-term stability assessment and mechanism analysis

[Display omitted] •The novel two-stage PN/A process achieved high-efficient nitrogen removal.•Partial denitrifying in ANA-EGSB improved the system’s nitrogen removal efficiency.•AOB and anammox bacteria dominated in nitritation and anammox reactor.•Separating nitritation and anammox facilitated syst...

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Bibliographic Details
Published in:Bioresource technology 2019-01, Vol.271, p.150-158
Main Authors: Jin, Pengfei, Li, Baikun, Mu, Dongyang, Li, Xiyao, Peng, Yongzhen
Format: Article
Language:English
Subjects:
Ammonium Compounds - analysis
Denitrification
Long-term stability
Municipal wastewater
Nitrates - metabolism
Nitrites - metabolism
Nitrogen - isolation & purification
Nitrosomonas - metabolism
Oxidation-Reduction
Sewage
Two-stage partial-nitritation/anammox (PN/A)
Waste Disposal, Fluid
Waste Water - microbiology
Wastewater quality fluctuation
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Summary:[Display omitted] •The novel two-stage PN/A process achieved high-efficient nitrogen removal.•Partial denitrifying in ANA-EGSB improved the system’s nitrogen removal efficiency.•AOB and anammox bacteria dominated in nitritation and anammox reactor.•Separating nitritation and anammox facilitated system’s stability and efficient. This study focused on the long-term stability of a novel two-stage partial-nitritation/anammox (PN/A) process treating municipal wastewater with fluctuated water quality. Specifically, two parallel sequencing batch reactors (SBRs) were used for removing organic matters and achieving complete nitritation, while the expanded granular sludge bed (ANA-EGSB) was used for anammox. With the influent ammonium concentration varying from 32 to 79 mg/L and the average hydraulic retention time of 3.39 h in this system, more than 93% of ammonium was removed and the effluent TIN was 4.8–11.8 mg/L. The partial denitrifying occurring in the anammox reactor could reduce nitrate to nitrite that was reused by anammox bacterium, enhancing the TIN removal efficiency. Further, the “overconsumption of ammonium” under anaerobic conditions was observed in ANA-EGSB. Microbial community analysis showed that Nitrosomonas (AOB) were the dominant nitrifying bacteria in the nitritation SBR and Candidatus_Brocadia with the relative abundance of 6–13% dominated in ANA-EGSB.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2018.09.097