Journal
BIORESOURCE TECHNOLOGY
Volume 343, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126132
Keywords
Anammox; Denitratation; Municipal wastewater; Nitritation; Step-feed sequencing batch reactor
Funding
- R&D Program of Beijing Municipal Education Commission [PXM2019_014204_000092]
- Biological Wastewater Treatment and Process Control Technology
- Beijing International Science and technology Cooperation Bas
- Beijing Municipal Commission of Education
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A novel double-anammox process for advanced mainstream nitrogen removal was established using a step-feed sequencing batch reactor (SBR) system, which effectively reduced total inorganic nitrogen concentration and achieved a 71.4% contribution of anammox to nitrogen removal. Gradient C/N reduction facilitated denitratation/anammox in the anoxic stage, and simultaneous nitritation and anammox were achieved in the oxic stage.
A novel double-anammox process for advanced mainstream nitrogen removal was established using step-feed sequencing batch reactor (SBR) system with integration of suspend sludge and biofilms. Following optimization of influent distribution ratio, the effluent total inorganic nitrogen (TIN) was < 10.2 mg N/L, with influent TIN of 43.4 mg N/L, and anammox contributed 71.4% to TIN removal. Biological processes and batch tests revealed that gradient C/N reduction promoted denitratation/anammox in anoxic stage, and simultaneous nitritation and anammox were achieved in oxic stage. Specially, anammox maintained on biofilms with abundance over 109 copies/ (g dry sludge). High-throughput sequencing revealed that Thauera and Nitrosomonas were enriched in flocs. Furthermore, metagenomic sequencing confirmed that Thauera owns narG and napA (NO3--> NO2-) and Nitrosomonas owns amoA (NH4+-> NO2-), support stable NO2- supply for double-anammox. This mainstream anammox-dominant process could potentially be used for stable nitrogen removal in municipal wastewater treatment plants.
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