Rearrangements of the nitrifiers population in an activated sludge system under decreasing solids retention times - Publication - Bridge of Knowledge

Search

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.

Citations

  • 4

    CrossRef

  • 0

    Web of Science

  • 5

    Scopus

Keywords

Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
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

seen 69 times

Recommended for you

Meta Tags