Effects of feeding and aeration strategies on N 2 O production and emission by an aerobic granular sludge system for municipal wastewater treatment.

Autor: Magnus BS; Department of Environmental and Civil Engineering, Federal University of Pernambuco, Recife, PE, 50740-550, Brazil. Electronic address: bruna.magnus@ufpe.br., Schambeck CM; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianopolis, SC, 88040-900, Brazil., Xavier JA; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianopolis, SC, 88040-900, Brazil., Freitas D; Department of Environmental and Civil Engineering, Federal University of Pernambuco, Recife, PE, 50740-550, Brazil., Guimarães LB; University Center of Araxá Plateau - Uniaraxá, Araxá, MG, 38180-084, Brazil., Leite W; Department of Environmental and Civil Engineering, Federal University of Pernambuco, Recife, PE, 50740-550, Brazil., Kato MT; Department of Environmental and Civil Engineering, Federal University of Pernambuco, Recife, PE, 50740-550, Brazil., da Costa RH; Department of Sanitary and Environmental Engineering, Federal University of Santa Catarina, Florianopolis, SC, 88040-900, Brazil.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Dec 13; Vol. 370, pp. 143899. Date of Electronic Publication: 2024 Dec 13.
DOI: 10.1016/j.chemosphere.2024.143899
Abstrakt: The effects of a single feeding cycle followed by a continuous aeration phase (AND C ) and a step-feeding cycle followed by intermittent aerobic/idle phases (AND I ) on the production and emission of nitrous oxide (N 2 O) from aerobic granular sludge (AGS) from real domestic sewage were studied. Higher N 2 O emissions were observed in the AND I treatment, and 9.2 ± 4.1% of the influent TN was emitted as N 2 O, while in the AND C treatment, 4.6 ± 2.5% of the influent TN was emitted as N 2 O. Both strategies were similar for carbon and total phosphorus removal; but AND I was advantageous for ammonium nitrogen and total nitrogen removal. Regarding the microbial populations associated with N 2 O production, genera such as Thauera, a heterotrophic denitrifier, were found to have a relative abundance of 2.1% in AND C and 3.8% in AND I . Defluviccocus and Tetrasphaera, organisms capable of denitrification and phosphorus removal, especially the latter, were present in AND C . Under AND I conditions, these organisms may have been replaced by fast-growing organisms, such as Thauera. Principal component analysis (PCA) showed that incomplete denitrification was the dominant effect in the AND C strategy. This may be related to the nitrate and phosphate concentrations and effluent characteristics (low C:N ratio). In the AND I strategy, incomplete denitrification and low polyhydroxyalkanoate (PHA) consumption were the main effects. This is indicated by the high nitrite and phosphate concentrations. Therefore, according to the PCA results, the combination of the AND C and AND I strategies can play a crucial operational role in the dynamics of N 2 O production and emission, especially considering that real domestic wastewater was used in the present research.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024. Published by Elsevier Ltd.)
Databáze: MEDLINE
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