Biofilm stratification and autotrophic-heterotrophic interactions in a structured bed reactor (SBRIA) for carbon and nitrogen removal

[Display omitted] •Aeration time and airflow interfered in nitrifying and denitrifying community.•Heterotrophic Nitrification-Aerobic Denitrification bacteria could grow in SBRIA.•Syntrophic relationship between anammox, nitrifier and denitrifier species ocurred. The structured-bed reactor with inte...

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Bibliographic Details
Published in:Bioresource technology 2023-03, Vol.372, p.128639-128639, Article 128639
Main Authors: Paniguel Oliveira, Eduardo, Giordani, Alessandra, Kawanishi, Juliana, Syrto Octavio de Souza, Theo, Okada, Dagoberto Y., Brucha, Gunther, Brito de Moura, Rafael
Format: Article
Language:English
Subjects:
Anammox
Biofilm Stratification
Biofilms
Bioreactors - microbiology
Carbon
Denifitrication
Denitrification
Intermittent aeration
Nitrification
Nitrogen - metabolism
RNA, Ribosomal, 16S - genetics
Sewage
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Summary:[Display omitted] •Aeration time and airflow interfered in nitrifying and denitrifying community.•Heterotrophic Nitrification-Aerobic Denitrification bacteria could grow in SBRIA.•Syntrophic relationship between anammox, nitrifier and denitrifier species ocurred. The structured-bed reactor with intermittent aeration (SBRIA) is a promising technology for simultaneous carbon and nitrogen removal from wastewater. An in depth understanding of the microbiological in the reactor is crucial for its optimization. In this research, biofilm samples from the aerobic and anoxic zones of an SBRIA were analyzed through 16S rRNA sequencing to evaluate the bacterial community shift with variations in the airflow and aeration time. The control of the airflow and aeration time were essential to guarantee reactor performances to nitrogen removal close to 80%, as it interfered in nitrifying and denitrifying communities. The aeration time of 1.75 h led to establishment of different nitrogen removal pathways by syntrophic relationships between nitrifier, denitrifier and anammox species. Additionally, the predominance of these different species in the internal and external parts of the biofilm varied according to the airflow.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2023.128639