Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times
Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved..
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 °C (winter) and 20 °C (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.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:214 |
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| Enthalten in: |
Environmental research - 214(2022), Pt 1 vom: 01. Nov., Seite 113753 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Kowal, Przemyslaw [VerfasserIn] |
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| Links: |
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| Themen: |
7664-41-7 |
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| Anmerkungen: |
Date Completed 30.08.2022 Date Revised 28.09.2022 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.envres.2022.113753 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved. | ||
| 520 | |a 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 °C (winter) and 20 °C (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 | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, Non-U.S. Gov't | |
| 650 | 4 | |a Candidatus nitrotoga | |
| 650 | 4 | |a Comammox | |
| 650 | 4 | |a Kinetic parameters | |
| 650 | 4 | |a NOB Washout | |
| 650 | 4 | |a Nitrospira | |
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| 700 | 1 | |a Sobotka, Dominika |e verfasserin |4 aut | |
| 700 | 1 | |a Ciesielski, Sławomir |e verfasserin |4 aut | |
| 700 | 1 | |a Mąkinia, Jacek |e verfasserin |4 aut | |
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