Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 768, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.144446
Keywords
Simultaneous nitritation, anammox and denitrification (SNAD); Integrated fixed-biofilm activated sludge (IFAS); Anammox; Self-generated; Aeration mode
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Funding
- National Natural Science Foundation of China [51978348, 51708311, 51778304]
- Natural Science Foundation of Shandong Province [ZR2017BEE002]
- Science and Technology Support Plan for Youth Innovation of Colleges in Shandong Province [DC2000000961]
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In this study, simultaneous nitritation, anammox and denitrification (SNAD) was quickly established in an integrated fixed-biofilm activated sludge (IFAS) reactor to treat high-ammonia municipal wastewater. The results showed high removal efficiencies of total nitrogen and chemical oxygen demand, and high-throughput sequencing analysis revealed the presence of anammox bacteria and ammonia oxidizing bacteria in the system.
In this study, by inoculating nitritation suspended sludge, simultaneous nitritation, anammox and denitrification (SNAD) was established quickly in an integrated fixed-biofilm activated sludge (IFAS) reactor to treat high-ammonia municipal wastewater. Results showed that, deep-level total nitrogen and chemical oxygen demand removal efficiencies (92.8% and 78.8%, respectively) were achieved, and their effluent concentrations were 13.2 and 39.3 mg/L, respectively. Excess generation of nitrate was once occurred under continuous aerobic condition, but it could be solved by suppressing nitrite oxidizing bacteria activity stably via switching to intermittent aeration mode (alternate 7 min of aerobic and 21 min of anoxic) and rising influent ammonium concentration temporarily (lasted 31 days). High-throughput sequencing analysis revealed that. Candidatus_Brocadia, as dominant anammox bacteria, was self-generated in flocs (2.93%) but mainly biofilm (7.67%), whereas uncultured_f_Nitrosomonadaceae as ammonia oxidizing bacteria was mainly found in flocs (2.4%). This work not only demonstrated that anammox bacteria could be self-generated and retained in the SNAD-IFAS system, but also suggested a promising application of the SNAD-IFAS in wastewater treatment plants. (C) 2021 Elsevier B.V. All rights reserved.
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