Challenges in achieving partial nitrification: Simultaneous nitrification-denitrification as the dominant pathway in municipal wastewater treatment

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Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorTakeda, Paula Yumi-
Autor(es): dc.creatorTavares Paula, Carolina-
Autor(es): dc.creatorBraz Carneiro, Rodrigo-
Autor(es): dc.creatordo Vale Borges, André-
Autor(es): dc.creatorCardoso Grangeiro, Luana-
Autor(es): dc.creatorRissato Zamariolli Damianovic, Márcia Helena-
Data de aceite: dc.date.accessioned2025-08-21T21:39:00Z-
Data de disponibilização: dc.date.available2025-08-21T21:39:00Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2025-04-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jece.2025.115839-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/302896-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/302896-
Descrição: dc.descriptionPartial nitrification (PN) is pivotal for energy-efficient nitrogen removal in wastewater treatment, yet challenges persist in stabilizing PN, particularly in mainstream municipal wastewater treatment. This study explores five operational strategies to optimize PN, encompassing varying dissolved oxygen (DO) concentrations, intermittent aeration, pH adjustment, hydraulic retention time (HRT) regulation, and nitrifying sludge treatment with free nitrous acid, alongside implementing short sludge retention time (SRT). Bench-scale reactor applying plug and continuous stirred flow regimes were employed, alongside a comprehensive analysis of microbial community dynamics. Despite efforts to suppress nitrite-oxidizing bacteria (NOB) and retain ammonium-oxidizing bacteria (AOB), stable PN was not achieved. Nevertheless, the simultaneous nitrification-denitrification (SND) process was identified as the primary pathway in this study. Nitrite accumulation ratio (NAR) ranged from 0 % to 97 % throughout the experimental period. The microbial community analysis revealed shifts in abundance and diversity, with heterotrophic denitrifiers dominating under low DO (0.1–0.2 mg L−1) and alkaline condition (pH = 8.6 ± 0.1). Notably, Ottowia (18.9 %) and Limnobacter (16.0 %) genera exhibited increased abundance, which corroborates the hypothesis of the SND pathway occurrence. This occurrence resulted in nitrogen removal efficiency up to 43.2 ± 5.9 %. Moreover, Nitrospira prevalence underscored NOB persistence despite operational strategies. While the study provides insights into PN and SND processes dynamics and microbial responses, further optimization is essential for stable PN in mainstream wastewater treatment.-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
Descrição: dc.descriptionBiological Processes Laboratory (LPB) São Carlos School of Engineering (EESC) University of São Paulo (USP), 400, João Dagnone Ave., Santa Angelina, São Paulo-
Descrição: dc.descriptionLaboratory of Chromatography (CROMA) São Carlos Institute of Chemistry University of São Paulo (USP), 400, Trabalhador São-Carlense Ave., São Paulo-
Descrição: dc.descriptionDepartment of Engineering Physics and Mathematics Institute of Chemistry (IQ) São Paulo State University (UNESP), 55, Prof. Francisco Degni Ave., Jardim Quitandinha, São Paulo-
Descrição: dc.descriptionDepartment of Engineering Physics and Mathematics Institute of Chemistry (IQ) São Paulo State University (UNESP), 55, Prof. Francisco Degni Ave., Jardim Quitandinha, São Paulo-
Descrição: dc.descriptionFAPESP: 2019/22532–0-
Descrição: dc.descriptionFAPESP: 2020/09912–6-
Descrição: dc.descriptionFAPESP: 2021/12399–1-
Idioma: dc.languageen-
Relação: dc.relationJournal of Environmental Chemical Engineering-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAnaerobically pre-treated wastewater-
Palavras-chave: dc.subjectFree nitrous acid treatment-
Palavras-chave: dc.subjectIntermittent aeration-
Palavras-chave: dc.subjectLow dissolved oxygen-
Palavras-chave: dc.subjectMunicipal wastewater-
Palavras-chave: dc.subjectNitrite-oxidizing bacteria-
Título: dc.titleChallenges in achieving partial nitrification: Simultaneous nitrification-denitrification as the dominant pathway in municipal wastewater treatment-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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