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Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times
Abstract
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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Authors (5)
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Sławomir Ciesielski
- Department of Environmental Biotechnology, Faculty of Geoengineering, University of Warmia and Mazury in Olsztyn, Ul. Sloneczna 45G, 10-709, Olsztyn, Poland
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- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.envres.2022.113753
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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ENVIRONMENTAL RESEARCH
no. 214,
ISSN: 0013-9351 - Language:
- English
- Publication year:
- 2022
- Bibliographic description:
- 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-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.envres.2022.113753
- Sources of funding:
- Verified by:
- Gdańsk University of Technology
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