Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido

Detalhes bibliográficos
Autor(a) principal: MATEUS, Marcos Vinícius
Data de Publicação: 2018
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFTM
Texto Completo: http://bdtd.uftm.edu.br/handle/tede/669
Resumo: Neste estudo, os efeitos dos surfactantes iônicos (laurilsulfato de sódio e ácido húmico) na transferência de oxigênio são investigados em um reator cilíndrico e em um tanque prismático com grade oscilante. Pela primeira vez, mostra-se um estudo sistemático em uma ampla faixa de concentração de surfactante, abaixo e acima da concentração micelar crítica (CMC). Em ambos os sistemas a presença de surfactante na água reduz o coeficiente volumétrico de transferência de oxigênio. No reator cilíndrico (aeração por bolhas), observou-se a redução máxima do coeficiente de transferência de massa volumétrica (KLa) em uma concentração de laurilsulfato de sódio de 0,3 mM, antes da CMC. Os resultados são discutidos com base em interações moleculares entre água, bolhas de ar e moléculas de surfactantes. Para melhor compreender os resultados experimentais, um modelo matemático foi desenvolvido com base no coeficiente estimado de transferência de massa volumétrica. As previsões concordam bem com os resultados experimentais e apontam para uma redução máxima de 41% na KLa, independentemente da vazão de ar injetada no reator cilíndrico. O modelo foi testado com êxito na previsão de dados de KLa reportados na literatura sob a influência de diferentes surfactantes. Para os experimentos no tanque prismático com grade oscilante (aeração superficial) e presença de ácidos húmicos, um comportamento similar foi observado independentemente da velocidade de movimentação da grade. Houve, porém, grande variabilidade experimental dificultando o ajuste do modelo a esse conjunto de dados, o que poderá será compensado com a realização de experimentos em triplicata. Assim, acredita-se que estes resultados podem ser usados para prever futuros resultados experimentais.
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spelling Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquidoReaeração.Surfactante iônico.Transferência global de oxigênio.Inteface Arágua.SDS.Ácidos húmicosReaeration.Ionic surfactant.Overall oxygen transfer.Air-water Interface.SDS.Tratamento de Águas de Abastecimento e ResiduáriasNeste estudo, os efeitos dos surfactantes iônicos (laurilsulfato de sódio e ácido húmico) na transferência de oxigênio são investigados em um reator cilíndrico e em um tanque prismático com grade oscilante. Pela primeira vez, mostra-se um estudo sistemático em uma ampla faixa de concentração de surfactante, abaixo e acima da concentração micelar crítica (CMC). Em ambos os sistemas a presença de surfactante na água reduz o coeficiente volumétrico de transferência de oxigênio. No reator cilíndrico (aeração por bolhas), observou-se a redução máxima do coeficiente de transferência de massa volumétrica (KLa) em uma concentração de laurilsulfato de sódio de 0,3 mM, antes da CMC. Os resultados são discutidos com base em interações moleculares entre água, bolhas de ar e moléculas de surfactantes. Para melhor compreender os resultados experimentais, um modelo matemático foi desenvolvido com base no coeficiente estimado de transferência de massa volumétrica. As previsões concordam bem com os resultados experimentais e apontam para uma redução máxima de 41% na KLa, independentemente da vazão de ar injetada no reator cilíndrico. O modelo foi testado com êxito na previsão de dados de KLa reportados na literatura sob a influência de diferentes surfactantes. Para os experimentos no tanque prismático com grade oscilante (aeração superficial) e presença de ácidos húmicos, um comportamento similar foi observado independentemente da velocidade de movimentação da grade. Houve, porém, grande variabilidade experimental dificultando o ajuste do modelo a esse conjunto de dados, o que poderá será compensado com a realização de experimentos em triplicata. Assim, acredita-se que estes resultados podem ser usados para prever futuros resultados experimentais.In this study, the effects of ionic surfactants (sodium dodecyl sulfate and humic acids) in the transfer of oxygen are investigated in a cylindrical reactor and in a prismatic tank with oscillating grid. For the first time, a systematic study is shown in a wide range of surfactant concentration, below and above the critical micelle concentration (CMC). In both systems the presence of surfactant in the water reduces the volumetric coefficient of oxygen transfer. In the cylindrical reactor (bubble aeration), the maximum reduction of the volumetric mass transfer coefficient (KLa) was observed in a 0.3 mM dodecyl sodium sulfate concentration prior to CMC. The results are discussed on the basis of molecular interactions between water molecules, air bubbles and surfactant molecules. To better understand the experimental findings, a mathematical model was developed based on the estimated volumetric mass transfer coefficient. The forecasts agree well with the experimental results and point to a maximum reduction of 41% in KLa, regardless of the air flow rate into the cylindrical reactor. The model was successfully tested in the prediction of KLa data reported in the literature under the influence of different surfactants. For experiments in the prismatic tank with oscillating grid (surface aeration) and presence of humic acids, a similar behavior was observed independently of the grid oscillation frequency. There was, however, high experimental variability making it difficult to adjust the model to this data set, what could be compensated by conducting experiments at triplicate. Thus, it is believed that these results can be used to predict future experimental results.Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorUniversidade Federal do Triângulo MineiroPró-Reitoria de Pesquisa e Pós-GraduaçãoBrasilUFTMPrograma de Pós-Graduação em Ciência e Tecnologia AmbientalLUZ, Mario Sérgio da02998119646http://lattes.cnpq.br/3211921907360668GONÇALVES, Julio Cesar de Souza Inácio32715545878http://lattes.cnpq.br/3449617170299224MATEUS, Marcos Vinícius2019-06-10T17:14:17Z2018-08-28info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfapplication/pdfMATEUS, Marcos Vinícius. Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido. 2018. 74f. 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dc.title.none.fl_str_mv Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
title Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
spellingShingle Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
MATEUS, Marcos Vinícius
Reaeração.
Surfactante iônico.
Transferência global de oxigênio.
Inteface Arágua.
SDS.
Ácidos húmicos
Reaeration.
Ionic surfactant.
Overall oxygen transfer.
Air-water Interface.
SDS.
Tratamento de Águas de Abastecimento e Residuárias
title_short Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
title_full Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
title_fullStr Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
title_full_unstemmed Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
title_sort Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido
author MATEUS, Marcos Vinícius
author_facet MATEUS, Marcos Vinícius
author_role author
dc.contributor.none.fl_str_mv LUZ, Mario Sérgio da
02998119646
http://lattes.cnpq.br/3211921907360668
GONÇALVES, Julio Cesar de Souza Inácio
32715545878
http://lattes.cnpq.br/3449617170299224
dc.contributor.author.fl_str_mv MATEUS, Marcos Vinícius
dc.subject.por.fl_str_mv Reaeração.
Surfactante iônico.
Transferência global de oxigênio.
Inteface Arágua.
SDS.
Ácidos húmicos
Reaeration.
Ionic surfactant.
Overall oxygen transfer.
Air-water Interface.
SDS.
Tratamento de Águas de Abastecimento e Residuárias
topic Reaeração.
Surfactante iônico.
Transferência global de oxigênio.
Inteface Arágua.
SDS.
Ácidos húmicos
Reaeration.
Ionic surfactant.
Overall oxygen transfer.
Air-water Interface.
SDS.
Tratamento de Águas de Abastecimento e Residuárias
description Neste estudo, os efeitos dos surfactantes iônicos (laurilsulfato de sódio e ácido húmico) na transferência de oxigênio são investigados em um reator cilíndrico e em um tanque prismático com grade oscilante. Pela primeira vez, mostra-se um estudo sistemático em uma ampla faixa de concentração de surfactante, abaixo e acima da concentração micelar crítica (CMC). Em ambos os sistemas a presença de surfactante na água reduz o coeficiente volumétrico de transferência de oxigênio. No reator cilíndrico (aeração por bolhas), observou-se a redução máxima do coeficiente de transferência de massa volumétrica (KLa) em uma concentração de laurilsulfato de sódio de 0,3 mM, antes da CMC. Os resultados são discutidos com base em interações moleculares entre água, bolhas de ar e moléculas de surfactantes. Para melhor compreender os resultados experimentais, um modelo matemático foi desenvolvido com base no coeficiente estimado de transferência de massa volumétrica. As previsões concordam bem com os resultados experimentais e apontam para uma redução máxima de 41% na KLa, independentemente da vazão de ar injetada no reator cilíndrico. O modelo foi testado com êxito na previsão de dados de KLa reportados na literatura sob a influência de diferentes surfactantes. Para os experimentos no tanque prismático com grade oscilante (aeração superficial) e presença de ácidos húmicos, um comportamento similar foi observado independentemente da velocidade de movimentação da grade. Houve, porém, grande variabilidade experimental dificultando o ajuste do modelo a esse conjunto de dados, o que poderá será compensado com a realização de experimentos em triplicata. Assim, acredita-se que estes resultados podem ser usados para prever futuros resultados experimentais.
publishDate 2018
dc.date.none.fl_str_mv 2018-08-28
2019-06-10T17:14:17Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv MATEUS, Marcos Vinícius. Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido. 2018. 74f. Dissertação (Mestrado em Ciência e Tecnologia Ambiental) - Programa de Pós-Graduação em Ciência e Tecnologia Ambiental, Universidade Federal do Triângulo Mineiro, Uberaba, 2018.
http://bdtd.uftm.edu.br/handle/tede/669
identifier_str_mv MATEUS, Marcos Vinícius. Efeito de surfactantes sobre o coeficiente volumétrico de transferência de massa de oxigênio da interface gás-líquido. 2018. 74f. Dissertação (Mestrado em Ciência e Tecnologia Ambiental) - Programa de Pós-Graduação em Ciência e Tecnologia Ambiental, Universidade Federal do Triângulo Mineiro, Uberaba, 2018.
url http://bdtd.uftm.edu.br/handle/tede/669
dc.language.iso.fl_str_mv por
language por
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publisher.none.fl_str_mv Universidade Federal do Triângulo Mineiro
Pró-Reitoria de Pesquisa e Pós-Graduação
Brasil
UFTM
Programa de Pós-Graduação em Ciência e Tecnologia Ambiental
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