Abstract—
The transition process caused by an abruptly increased ammonium load (2.5-fold) on the microbial community of a sequential batch reactor carrying out nitrogen removal from the water via nitritation-anammox was studied. The community developed in the bioreactor at incoming ammonium concentration of 200 mg N/L removed 76.5% of the inflowing nitrogen and was satisfactorily described by the BioWin mathematical simulator with corrected coefficients. Abrupt increase of nitrogen load from 200 to 500 mg N/L resulted in ammonium concentration at the reactor outlet increasing from 27 to 280–290 mg N/L, with nitrogen removal efficiency dropping to 40%. The calculation using the BioWin simulator showed that the efficiency of the nitritation-anammox process should increase in the course of a month and stabilize at the level close to the original one (76.5%). However, experimental data did not support this calculation: no increase in efficiency was observed during this period. Changes in the structural and functional characteristics of the biofilms and aggregates, which were not accounted for in the model, were probably responsible for discrepancies between the experimental and calculated data.
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The work was partially supported by the Russian Foundation for Basic Research, project no. 18-29-08008 mk and by the Ministry of Science and Higher Education of theRussian Federation (State Assignment).
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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.
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Translated by P. Sigalevich
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Dorofeev, A.G., Nikolaev, Y.A., Grachev, V.A. et al. Effect of Abrupt Increase in Ammonium Load on Activity of the Anammox Bacterial Community in a Sequencing Batch Reactor. Microbiology 90, 763–771 (2021). https://doi.org/10.1134/S0026261721060060
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DOI: https://doi.org/10.1134/S0026261721060060