Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times - Publikacja - MOST Wiedzy

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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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Informacje szczegółowe

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. Part 1 (2022), s.113753-
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.envres.2022.113753
Źródła finansowania:
Weryfikacja:
Politechnika Gdańska

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