Abstract
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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Funding
This work was supported in part by the Natural Science Foundation of China (Grant number: 51478410) and Natural Science Research of Jiangsu Higher Education Institutions of China (Grant number: 19KJD610004).
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Chen, W., Chen, S., Hu, F. et al. A novel anammox reactor with a nitrogen gas circulation: performance, granule size, activity, and microbial community. Environ Sci Pollut Res 27, 18661–18671 (2020). https://doi.org/10.1007/s11356-020-08432-w
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DOI: https://doi.org/10.1007/s11356-020-08432-w