Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times

Przemysław Kowal; Mohamad-Javad Mehrani; Dominika Sobotka; Sławomir Ciesielski; Jacek Mąkinia

doi:10.1016/j.envres.2022.113753

Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times

Abstrakt

Due to the key role of nitrite in novel nitrogen removal systems, nitrite oxidizing bacteria (NOB) have been receiving increasing attention. In this study, the coexistence and interactions of nitrifying bacteria were explored at decreasing solids retention times (SRTs). Four 5-week washout experiments were carried out in laboratory-scale (V=10 L) sequencing batch reactors (SBRs) with mixed liquor from two full-scale activated sludge systems (continuous flow vs SBR). During the experiments, the SRT was gradually reduced from the initial value of 4.0 d to approximately 1.0 d. The reactors were operated under limited dissolved oxygen conditions (set point of 0.6 mg O2/L) and two process temperatures: 12℃ (winter) and 20℃ (summer). At both temperatures, the progressive SRT reduction was inefficient for the out-selection of both canonical NOB and comammox Nitrospira. However, the dominant NOB switched from Nitrospira to Ca. Nitrotoga, whereas the dominant AOB was always Nitrosomonas. The results of this study are important for optimizing NOB suppression strategies in the novel N removal processes, which are based on nitrite accumulation.

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Autorzy (5)

Przemysław Kowal dr inż.
Mohamad-Javad Mehrani
Dominika Sobotka dr inż.
Sławomir Ciesielski
- Department of Environmental Biotechnology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Ul. Sloneczna 45G, 10-709, Olsztyn, Poland
Jacek Mąkinia prof. dr hab. inż.

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Wersja publikacji: Accepted albo Published Version
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.envres.2022.113753
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Kategoria:

Publikacja w czasopiśmie

Typ:

artykuły w czasopismach

Opublikowano w:

ENVIRONMENTAL RESEARCH nr 214,
ISSN: 0013-9351

Język:

angielski

Rok wydania:

2022

Opis bibliograficzny:

Kowal P., Mehrani M., Sobotka D., Ciesielski S., Mąkinia J.: Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times// ENVIRONMENTAL RESEARCH -Vol. 214,iss. 1 (2022), s.113753-

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