Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Tipo de documento: | Tese |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFPE |
Texto Completo: | https://repositorio.ufpe.br/handle/123456789/49147 |
Resumo: | Aerobic granular sludge (AGS) has been widely used in recent decades as an alternative to conventional activated sludge systems for treating domestic sewage. AGS increases biomass retention and sedimentation and enables the simultaneous removal of nutrients and organic matter, making it applicable to a wide range of wastewater types, temperatures, and reactor scales, as evidenced in the literature. However, previous studies investigating the roles of engineering parameters such as volumetric organic load, temperature, and hydraulic retention time in the granulation process in AGS systems show yet no consensus, hindering the development of a precisely predictable system. In this context, the mathematical modeling of these systems may provide valuable insights for a more comprehensive understanding of microbial biochemical conversions in AGS systems. Hence, this work investigates the influence of temperature, cycle configuration, and influent composition in sequencing batch reactors (SBR) systems with AGS of different scales, focusing on understanding sensitive parameters through mathematical modeling. For this purpose, four different methodological strategies were used. Initially, two different cycle configurations in a pilot-scale (PS) SBR (115 L) were used to cultivate AGS without inoculum at approximately 30 °C. Data from these experiments were then used to implement and calibrate the biofilm model proposed by Wanner and Gujer (1986) associated with the activated sludge model n° 3 (ASM3 – GUJER et al., 1999). The model calibration showed high sensitivity of diffusion-associated parameters such as boundary layer thickness. To assess these results, we analyzed diffusion, boundary layer thickness, as well as the presence and size of aerobic/anaerobic layers from O2 micro-profiles using granules (1.4- 2.0 mm diameter) collected from two lab-scale (LS) SBR (9.1 and 11.2 L) operated at 20 and 30 °C. The LS reactors were also monitored to investigate the influence of temperature on AGS formation, morphology, and stability. This approach to model implementation enabled the description of a non-steady state AGS system performance related to solids and COD removal. However, it could not capture the complexity of nitrogen removal processes in AGS (under different redox conditions) by assuming a single diameter for all granules. The temperature, in turn, was a primary factor in determining AGS stability, formation, and morphology in the LS reactors. Granules formed at 30 °C (LS) were larger, more compact, and considerably more stable against system disturbances. In addition, a prolonged anaerobic phase or the insertion of air pulses during slow feeding were configuration strategies for SBR cycles that improved the granulation process. The wastewater composition directly affected microbial diversity and system performance, with lower efficiency observed when lower loads were applied. Finally, implementing mathematical models in non-steady-state systems allowed us to analyze the influence of setting fixed parameters, with the number of granules and boundary layer thickness among the most sensitive parameters. |
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ARAÚJO, Julliana Melo Pinheiro dehttp://lattes.cnpq.br/8021870461846085http://lattes.cnpq.br/9481193101590250http://lattes.cnpq.br/0215255620469809SANTOS, Maria de Lourdes Florencio dosWICHERN, Marc2023-02-16T16:25:29Z2023-02-16T16:25:29Z2022-11-18ARAÚJO, Julliana Melo Pinheiro de. Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment: experimental and modeling studies. 2022. Tese (Doutorado em Engenharia Civil) - Universidade Federal de Pernambuco, Recife, 2022.https://repositorio.ufpe.br/handle/123456789/49147Aerobic granular sludge (AGS) has been widely used in recent decades as an alternative to conventional activated sludge systems for treating domestic sewage. AGS increases biomass retention and sedimentation and enables the simultaneous removal of nutrients and organic matter, making it applicable to a wide range of wastewater types, temperatures, and reactor scales, as evidenced in the literature. However, previous studies investigating the roles of engineering parameters such as volumetric organic load, temperature, and hydraulic retention time in the granulation process in AGS systems show yet no consensus, hindering the development of a precisely predictable system. In this context, the mathematical modeling of these systems may provide valuable insights for a more comprehensive understanding of microbial biochemical conversions in AGS systems. Hence, this work investigates the influence of temperature, cycle configuration, and influent composition in sequencing batch reactors (SBR) systems with AGS of different scales, focusing on understanding sensitive parameters through mathematical modeling. For this purpose, four different methodological strategies were used. Initially, two different cycle configurations in a pilot-scale (PS) SBR (115 L) were used to cultivate AGS without inoculum at approximately 30 °C. Data from these experiments were then used to implement and calibrate the biofilm model proposed by Wanner and Gujer (1986) associated with the activated sludge model n° 3 (ASM3 – GUJER et al., 1999). The model calibration showed high sensitivity of diffusion-associated parameters such as boundary layer thickness. To assess these results, we analyzed diffusion, boundary layer thickness, as well as the presence and size of aerobic/anaerobic layers from O2 micro-profiles using granules (1.4- 2.0 mm diameter) collected from two lab-scale (LS) SBR (9.1 and 11.2 L) operated at 20 and 30 °C. The LS reactors were also monitored to investigate the influence of temperature on AGS formation, morphology, and stability. This approach to model implementation enabled the description of a non-steady state AGS system performance related to solids and COD removal. However, it could not capture the complexity of nitrogen removal processes in AGS (under different redox conditions) by assuming a single diameter for all granules. The temperature, in turn, was a primary factor in determining AGS stability, formation, and morphology in the LS reactors. Granules formed at 30 °C (LS) were larger, more compact, and considerably more stable against system disturbances. In addition, a prolonged anaerobic phase or the insertion of air pulses during slow feeding were configuration strategies for SBR cycles that improved the granulation process. The wastewater composition directly affected microbial diversity and system performance, with lower efficiency observed when lower loads were applied. Finally, implementing mathematical models in non-steady-state systems allowed us to analyze the influence of setting fixed parameters, with the number of granules and boundary layer thickness among the most sensitive parameters.DAADO lodo granular aeróbio (LGA) vem sendo amplamente utilizado nas últimas décadas como alternativa ao sistema de lodos ativados convencional para o tratamento de águas residuárias domésticas. Essa tecnologia aumenta a retenção de biomassa e sedimentação e permite a remoção simultânea de nutrientes e matéria orgânica, tornando-o aplicável a grande diversidade de águas residuárias, temperaturas e escalas, como evidenciado na literatura. Entretanto, estudos anteriores investigando os papéis de parâmetros de engenharia, como carga orgânica volumétrica, temperatura e tempo de retenção hidráulica no processo de granulação em sistemas LGA ainda não mostram consenso, não sendo ainda possível desenvolver um sistema precisamente previsível. Neste contexto, a modelagem matemática destes sistemas pode fornecer conhecimentos valiosos para uma maior compreensão das conversões bioquímicas microbianas nos grânulos. Sendo assim, esse trabalho teve como objetivo investigar a influência da temperatura, configuração do ciclo e composição afluente em sistemas SBR com LGA de diferentes escalas, concentrando-se na compreensão de parâmetros sensíveis durante a implementação de modelos matemáticos. Para isso, quatro diferentes estratégias metodológicas foram utilizadas. Inicialmente, diferentes configurações de ciclo foram utilizadas em um RBS em escala piloto (115 L) para o cultivo de LGA sem inóculo sob temperaturas próximas a 30 °C. Os dados provenientes destes experimentos foram então utilizados para implementar e calibrar o modelo de biofilme proposto por Wanner e Gujer (1986) associado ao modelo de lodo ativado n° 3 (ASM3 – GUJER et al., 1999). Durante a calibração do modelo, uma alta sensibilidade dos parâmetros associados à difusão, tais como espessura da camada limite, foi observada. Para melhor entender estes resultados, grânulos (diâmetro entre 1.4 e 2.0 mm) provenientes de dois RBS em escala de laboratório (LS, 9,1 e 11,2 L) foram utilizados para analisar difusão de oxigênio, a presença e o tamanho de camadas aeróbias/anaeróbias, bem como estimar a espessura da camada limite através de micro-perfis de O2. Os reatores LS (operados a 20 e 30 °C, respectivamente) também foram monitorados buscando investigar a influência da temperatura na formação, morfologia e estabilidade do LGA. Esta abordagem de implementação do modelo permitiu a descrição do desempenho de um sistema LGA em estado não estacionário em termos de sólidos e remoção de DQO. Entretanto, não foi possível cobrir a complexidade dos processos de remoção de nitrogênio nos grânulos (e suas diferentes condições redox) assumindo um único diâmetro para todos. A temperatura, por sua vez, foi um fator decisivo na estabilidade, formação e morfologia do LGA nos reatores LS. Os grânulos formados a 30 °C (LS) eram maiores, mais compactos e consideravelmente mais estáveis contra distúrbios no sistema. Além disso, uma fase anaeróbia mais prolongada e/ou a inserção de pulsos de ar durante a alimentação lenta foram estratégias de configuração para ciclos SBR que, de modo geral, melhoraram o processo de granulação. A composição do afluente afetou diretamente a diversidade microbiana e o desempenho nos sistemas, sendo observada menores eficiências quando cargas mais baixas foram aplicadas. Por fim, a implementação de modelos matemáticos em um sistema em estado não estacionário permitiu analisar a influência da configuração de parâmetros fixos, estando o número de grânulos e a espessura da camada limite entre os parâmetros mais sensíveis.engUniversidade Federal de PernambucoPrograma de Pos Graduacao em Engenharia CivilUFPEBrasilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessEngenharia civilClima tropicalEsgoto municipal realLodo granular aeróbio (LGA)Modelagem matemáticaReatores em bateladas sequenciais (RBS)Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studiesinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisdoutoradoreponame:Repositório Institucional da UFPEinstname:Universidade Federal de Pernambuco (UFPE)instacron:UFPEORIGINALTESE Julliana Melo Pinheiro de Araújo.pdfTESE Julliana Melo Pinheiro de Araújo.pdfapplication/pdf6158043https://repositorio.ufpe.br/bitstream/123456789/49147/1/TESE%20Julliana%20Melo%20Pinheiro%20de%20Ara%c3%bajo.pdfcfc72d5d68e26c2fc601f9492c35b621MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.pt_BR.fl_str_mv |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
title |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
spellingShingle |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies ARAÚJO, Julliana Melo Pinheiro de Engenharia civil Clima tropical Esgoto municipal real Lodo granular aeróbio (LGA) Modelagem matemática Reatores em bateladas sequenciais (RBS) |
title_short |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
title_full |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
title_fullStr |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
title_full_unstemmed |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
title_sort |
Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment : experimental and modeling studies |
author |
ARAÚJO, Julliana Melo Pinheiro de |
author_facet |
ARAÚJO, Julliana Melo Pinheiro de |
author_role |
author |
dc.contributor.authorLattes.pt_BR.fl_str_mv |
http://lattes.cnpq.br/8021870461846085 |
dc.contributor.advisorLattes.pt_BR.fl_str_mv |
http://lattes.cnpq.br/9481193101590250 |
dc.contributor.advisor-coLattes.pt_BR.fl_str_mv |
http://lattes.cnpq.br/0215255620469809 |
dc.contributor.author.fl_str_mv |
ARAÚJO, Julliana Melo Pinheiro de |
dc.contributor.advisor1.fl_str_mv |
SANTOS, Maria de Lourdes Florencio dos |
dc.contributor.advisor-co1.fl_str_mv |
WICHERN, Marc |
contributor_str_mv |
SANTOS, Maria de Lourdes Florencio dos WICHERN, Marc |
dc.subject.por.fl_str_mv |
Engenharia civil Clima tropical Esgoto municipal real Lodo granular aeróbio (LGA) Modelagem matemática Reatores em bateladas sequenciais (RBS) |
topic |
Engenharia civil Clima tropical Esgoto municipal real Lodo granular aeróbio (LGA) Modelagem matemática Reatores em bateladas sequenciais (RBS) |
description |
Aerobic granular sludge (AGS) has been widely used in recent decades as an alternative to conventional activated sludge systems for treating domestic sewage. AGS increases biomass retention and sedimentation and enables the simultaneous removal of nutrients and organic matter, making it applicable to a wide range of wastewater types, temperatures, and reactor scales, as evidenced in the literature. However, previous studies investigating the roles of engineering parameters such as volumetric organic load, temperature, and hydraulic retention time in the granulation process in AGS systems show yet no consensus, hindering the development of a precisely predictable system. In this context, the mathematical modeling of these systems may provide valuable insights for a more comprehensive understanding of microbial biochemical conversions in AGS systems. Hence, this work investigates the influence of temperature, cycle configuration, and influent composition in sequencing batch reactors (SBR) systems with AGS of different scales, focusing on understanding sensitive parameters through mathematical modeling. For this purpose, four different methodological strategies were used. Initially, two different cycle configurations in a pilot-scale (PS) SBR (115 L) were used to cultivate AGS without inoculum at approximately 30 °C. Data from these experiments were then used to implement and calibrate the biofilm model proposed by Wanner and Gujer (1986) associated with the activated sludge model n° 3 (ASM3 – GUJER et al., 1999). The model calibration showed high sensitivity of diffusion-associated parameters such as boundary layer thickness. To assess these results, we analyzed diffusion, boundary layer thickness, as well as the presence and size of aerobic/anaerobic layers from O2 micro-profiles using granules (1.4- 2.0 mm diameter) collected from two lab-scale (LS) SBR (9.1 and 11.2 L) operated at 20 and 30 °C. The LS reactors were also monitored to investigate the influence of temperature on AGS formation, morphology, and stability. This approach to model implementation enabled the description of a non-steady state AGS system performance related to solids and COD removal. However, it could not capture the complexity of nitrogen removal processes in AGS (under different redox conditions) by assuming a single diameter for all granules. The temperature, in turn, was a primary factor in determining AGS stability, formation, and morphology in the LS reactors. Granules formed at 30 °C (LS) were larger, more compact, and considerably more stable against system disturbances. In addition, a prolonged anaerobic phase or the insertion of air pulses during slow feeding were configuration strategies for SBR cycles that improved the granulation process. The wastewater composition directly affected microbial diversity and system performance, with lower efficiency observed when lower loads were applied. Finally, implementing mathematical models in non-steady-state systems allowed us to analyze the influence of setting fixed parameters, with the number of granules and boundary layer thickness among the most sensitive parameters. |
publishDate |
2022 |
dc.date.issued.fl_str_mv |
2022-11-18 |
dc.date.accessioned.fl_str_mv |
2023-02-16T16:25:29Z |
dc.date.available.fl_str_mv |
2023-02-16T16:25:29Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
ARAÚJO, Julliana Melo Pinheiro de. Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment: experimental and modeling studies. 2022. Tese (Doutorado em Engenharia Civil) - Universidade Federal de Pernambuco, Recife, 2022. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufpe.br/handle/123456789/49147 |
identifier_str_mv |
ARAÚJO, Julliana Melo Pinheiro de. Influence of temperature and diffusion on aerobic granular sludge for municipal wastewater treatment: experimental and modeling studies. 2022. Tese (Doutorado em Engenharia Civil) - Universidade Federal de Pernambuco, Recife, 2022. |
url |
https://repositorio.ufpe.br/handle/123456789/49147 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Pernambuco |
dc.publisher.program.fl_str_mv |
Programa de Pos Graduacao em Engenharia Civil |
dc.publisher.initials.fl_str_mv |
UFPE |
dc.publisher.country.fl_str_mv |
Brasil |
publisher.none.fl_str_mv |
Universidade Federal de Pernambuco |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFPE instname:Universidade Federal de Pernambuco (UFPE) instacron:UFPE |
instname_str |
Universidade Federal de Pernambuco (UFPE) |
instacron_str |
UFPE |
institution |
UFPE |
reponame_str |
Repositório Institucional da UFPE |
collection |
Repositório Institucional da UFPE |
bitstream.url.fl_str_mv |
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bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 MD5 MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFPE - Universidade Federal de Pernambuco (UFPE) |
repository.mail.fl_str_mv |
attena@ufpe.br |
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1802310865564729344 |