Next Article in Journal
The Right to Water, Law and Municipal Practice: Case Studies from India
Previous Article in Journal
Patterns of Past and Future Droughts in Permanent Lowland Rivers
Article

Effect of the Aeration Strategy on NOB Suppression in Activated Sludge and Biofilm in a Hybrid Reactor with Nitrification/Denitrification

1
Department of Water Supply and Wastewater Treatment, Faculty of Building Services Hydro and Environmental Engineering, Warsaw University of Technology, Nowowiejska 20, 00-653 Warsaw, Poland
2
Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna 45G, 10-709 Olsztyn, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Mehrab Mehrvar and Marta Gmurek
Water 2022, 14(1), 72; https://doi.org/10.3390/w14010072
Received: 24 November 2021 / Revised: 15 December 2021 / Accepted: 28 December 2021 / Published: 1 January 2022
The purpose of the study was to analyse the impact of aeration strategies defined by the changes in the duration of aerated sub-phases, the ratio between non-aerated and aerated sub-phase times (R), and dissolved oxygen concentrations (DO) on the suppression of nitrite-oxidizing bacteria (NOB) in activated sludge and biofilm developing in a hybrid reactor with nitrification/denitrification. The primary factor causing NOB suppression both in biofilm and in activated sludge was an increase in the R-value (from 0 to 1/4 and from 1/4 to 1/3). After reducing the DO from 3 to 2 mg O2/L, there were no changes in the frequency of NOB occurrence, and no reduction in the nitrite oxidation rate was recorded. The abundance of Comammox bacteria was considerably affected by the change from continuous to intermittent aeration. Activated sludge showed a substantial increase in the quantity of clade A and B, whereas the quantity considerably decreased in biofilm. View Full-Text
Keywords: nitrite-oxidizing bacteria; Comammox; IFAS; partial nitrification; dissolved oxygen; intermittent aeration nitrite-oxidizing bacteria; Comammox; IFAS; partial nitrification; dissolved oxygen; intermittent aeration
Show Figures

Figure 1

MDPI and ACS Style

Zajac, O.; Zubrowska-Sudol, M.; Ciesielski, S.; Godzieba, M. Effect of the Aeration Strategy on NOB Suppression in Activated Sludge and Biofilm in a Hybrid Reactor with Nitrification/Denitrification. Water 2022, 14, 72. https://doi.org/10.3390/w14010072

AMA Style

Zajac O, Zubrowska-Sudol M, Ciesielski S, Godzieba M. Effect of the Aeration Strategy on NOB Suppression in Activated Sludge and Biofilm in a Hybrid Reactor with Nitrification/Denitrification. Water. 2022; 14(1):72. https://doi.org/10.3390/w14010072

Chicago/Turabian Style

Zajac, Olga, Monika Zubrowska-Sudol, Slawomir Ciesielski, and Martyna Godzieba. 2022. "Effect of the Aeration Strategy on NOB Suppression in Activated Sludge and Biofilm in a Hybrid Reactor with Nitrification/Denitrification" Water 14, no. 1: 72. https://doi.org/10.3390/w14010072

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop