Oxygen uptake rate in microbial processes: An overview

Garcı́a-Ochoa, Félix; Gómez, Eduardo Escalante; Santos, Victoria E.; Merchuk, José C.

doi:10.1016/j.bej.2010.01.011

Cited by 372 publications

(226 citation statements)

References 90 publications

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“…However, the drawback of the method is that it can be used only for physical absorption. In the presence of a chemical/biochemical reaction, a reaction enhancement factor needs to be considered in the models describing the mass transfer rate [8,27,28]. This become relevant especially when fast chemical/biochemical reactions take place.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

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Abstract:The paper presents a brief overview of experiments on volumetric mass transfer coefficient in bubble columns. The available experimental data published are often incomparable due to the different type of gas distributor and different operating conditions used by various authors. Moreover, the value of the coefficient obtained experimentally is very sensitive to the particular method and to the physical models used in its evaluation. It follows that the Dynamic Pressure Method (DPM) is able to provide physically correct values not only in lab-scale contactors but also in pilot-scale reactors. However, the method was not correctly proven in bubble columns. In present experiments, DPM was employed in a laboratory-scale bubble column with a coalescent phase and tested in the pure heterogeneous flow regime. The method was successfully validated by the measurements under two different conditions relevant to the mass transfer. First, the ideal pressure step was compared with the non-ideal pressure step. Second, the pure oxygen absorption was compared with the simultaneous oxygen-and-nitrogen absorption. The obtained results proved that DPM is suitable for measuring the mass transport in bubble columns and to provide reliable data of volumetric mass transfer coefficient.

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Section: Introductionmentioning

confidence: 99%

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

et al. 2018

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“…A Mass balance for the dissolved oxygen in any bioreactor can be obtained. For a well-mixed liquid phase, the mass balance equation can be established as discussed by Garcia-Ochoa et al [9]:…”

Section: Oxygen Transfer Rate (Otr)mentioning

confidence: 99%

Evaluating the Use of Airlift Pumps for Bioreactor Applications

Mohammed¹,

Ahmed²,

Singh³

2017

Proceedings of the 4th International Conference of Fluid Flow, Heat and Mass Transfer (FFHMT'17)

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-In this study, preliminary experiments were performed in order to evaluate the performance of bioreactor using airlift pump. A patented airlift technology is integrated in a bioreactor and compared to a stirred tank bioreactor. Oxygen mass transfer and water salinity were used to characterize the mixing effectiveness. For the same aeration rate, power consumption is used to compare both conventional and airlift systems at different operating conditions. Also, airlift pump found to create a larger number of bubbles and consequently larger total surface area that allow for more interfacial oxygen transport. The results show a great potential of airlift use in bioreactors to achieve better bioreactor performance with a huge power reduction.

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“…Portanto, as curvas de p O2 e de OUR (Figura 2) apresentam comportamentos contrários, sendo a queda no p O2 causada pela respiração celular. Assim como a curva de q O2 e biomassa, as curvas de p O2 e de OUR estão interrelacionadas e apresentaram a evolução típica para cultivos aeróbios descrita por Garcia-Ochoa et al (2010). De maneira geral, o aumento gradual da biomassa observado na fase exponencial de crescimento na Figura 1, com consequente aumento do consumo de substrato e da demanda de oxigênio (indicado pelo crescimento da OUR na Figura 2), provocou uma queda da concentração de oxigênio dissolvido no meio.…”

Section: Balanço De Massa Para O Oxigênio: Perfil De P O2 E Ourunclassified

Avaliação Da Influência Das Células De Bacillus Megaterium Na Determinação Do Coeficiente De Transferência De Oxigênio Em Cultivo Submerso

Lorenzini¹,

Faccin²,

Ayub³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -O coeficiente volumétrico de transferência de oxigênio (k L a) é um critério importante no dimensionamento e escalonamento de biorreatores aeróbios. Esse parâmetro é afetado por diversos fatores, como as condições operacionais e as propriedades do meio de cultivo. No presente trabalho, procurou-se identificar se a biomassa viável e a concentração dessa afetam os valores de k L a em um cultivo de Bacillus megaterium. Para isso, realizou-se um cultivo batelada em biorreator do tipo tanque agitado, mantendo-se constantes as condições de temperatura, aeração e velocidade de agitação. Os valores de k L a foram determinados periodicamente através do método dinâmico. O valor de k L a não foi significativamente influenciado pela presença de biomassa, conforme confirmado por análise de variância. Esse resultado permite que seja feita a determinação prévia do valor de k L a em biorreator sem células e, assim, elimina-se a problemática da medição do coeficiente durante o cultivo para o sistema estudado.

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Oxygen uptake rate in microbial processes: An overview

Cited by 372 publications

References 90 publications

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

Measurement of Volumetric Mass Transfer Coefficient in Bubble Columns

Evaluating the Use of Airlift Pumps for Bioreactor Applications

Avaliação Da Influência Das Células De Bacillus Megaterium Na Determinação Do Coeficiente De Transferência De Oxigênio Em Cultivo Submerso

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