Journal
BIORESOURCE TECHNOLOGY
Volume 345, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126539
Keywords
Partial nitrification; Mainstream anammox; Candidatus Brocadia; In-situ enrichment
Funding
- R&D Program of Beijing Municipal Education Commission [PXM2019_014204_000092]
- 111 project [D16003]
- Funding Projects of Beijing Municipal Commission of Education
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A continuous plug-flow reactor was used to treat municipal wastewater, achieving stable nitrification and denitrification through different zones and conditions. Results showed that the PN-SAED process had high nitrogen removal efficiency and contribution rate, making it a promising method for nitrogen removal.
A continuous plug-flow reactor with anaerobic/front-aerobic/anoxic/post-aerobic zones, where partial nitrifi-cation occurred in the front-aerobic zone, followed by simultaneous anammox and endogenous denitrification in the anoxic zone (PN-SAED), was built up to treat municipal wastewater. Alternating anoxic/aerobic conditions and longer anoxic duration facilitated stable partial nitrification. The nitrite accumulation ratio (NAR) was maintained at 97.4 +/- 1.2%, with temperatures between 13.3 degrees C to 19.8 degrees C. Candidatus Brocadia were naturally enriched in-situ from the anoxic zone with relative abundances of 31.93% and 6.67% on the agitator blade and carriers, respectively. High removal efficiencies of total inorganic nitrogen (TIN) (95.1 +/- 1.9%) and effluent TIN (2.6 +/- 1.1 mg N/L) were acquired from low COD/TIN (3.4 +/- 0.4) municipal wastewater with anammox contribution of 13.5% +/- 5.8% to TIN removal. The PN-SAED process is a promising mainstream nitrogen removal method.
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