Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 15, Pages 18661-18671Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-08432-w
Keywords
Dissolved oxygen loading; Granular aggregates; Activity test; Denitrifying bacteria; Nitrogen removal; Biomass segregation
Categories
Funding
- Natural Science Foundation of China [51478410]
- Natural Science Research of Jiangsu Higher Education Institutions of China [19KJD610004]
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Anammox process was regarded to be one of the vital links to achieve energy-saving or energy-producing wastewater treatment plant. In the study, an anammox reactor with the nitrogen gas circulation was constructed to culture anammox granules, and the performance, granule size distribution, and microbial community were investigated. Dissolved oxygen loading is found to be an important factor for the start-up of the anammox process, and the nitrogen removal rate of 2.12 kg N m(-3) day(-1) was achieved under the average nitrogen loading rate of 2.6 kg N m(-3) day(-1). The activity test showed that the highest specific anammox activity of 345.9 mg N gVSS(-1) day(-1) was achieved for granules with size of 0.5-1.0 mm. The Illumina high-throughput sequencing analysis revealed the consistent variation of Candidatus Brocadia and Denitratisoma abundance in granues of all sizes, suggesting possible synergistic mechanism between heterotrophic bacteria Denitratisoma and anammox bacteria Ca. Brocadia. Furthermore, the results indicated the reactor with the nitrogen gas circulation is an efficient strategy to start-up anammox.
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