The studies on the oxygen mass transfer coefficient in a bioreactor

Özbek, Belma; Gayik, Sevgi

doi:10.1016/s0032-9592(00)00272-7

Cited by 136 publications

(105 citation statements)

References 27 publications

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“…In the three-phase system stirred by CD 6-RT impellers, volumetric mass transfer coefficients for the lowest values of superficial gas velocity were even lower than those for gas-liquid system. These observations are also confirmed by the literature results concerning single-impeller (Alper et al, 1980;Özbek & Gayik, 2001) or doubleimpeller (Galaction et al, 2004) systems. For low concentration of solids, the increase of k L a values can be explained by the interaction of particles with gas bubbles.…”

Section: The Results For Gas-solid-liquid Systemsupporting

confidence: 90%

“…10b) configuration. This tendency (reduction of k L a with increasing solid concentrations) was observed also in literature (Özbek & Gayik, 2001). It was proposed that increasing solid concentration causes an increase of slurry viscosity, resulting in an increase of coalescence processes and, in consequence, decrease of k L a coefficients.…”

Section: The Results For Gas-solid-liquid Systemsupporting

confidence: 77%

“…The effect of solids on k L a could be probably associated with the differences in flow patterns generated in the agitated vessel as seen by the significant differences in the k L a values obtained using different impeller designs. Özbek and Gayik (2001) stated that the concentration at which k L a began to decline depended on solids type and size of the particles.…”

Section: The Results For Gas-solid-liquid Systemmentioning

confidence: 99%

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Mass Transfer in Multiphase Mechanically Agitated Systems

Kiełbus-Rąpała¹,

Karcz²

2011

Mass Transfer in Multiphase Systems and Its Applications

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Section: The Results For Gas-solid-liquid Systemsupporting

confidence: 90%

Section: The Results For Gas-solid-liquid Systemsupporting

confidence: 77%

Section: The Results For Gas-solid-liquid Systemmentioning

confidence: 99%

See 1 more Smart Citation

Mass Transfer in Multiphase Mechanically Agitated Systems

Kiełbus-Rąpała¹,

Karcz²

2011

Mass Transfer in Multiphase Systems and Its Applications

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“…It represents the most important parameter implied on the design and operation of mixingsparging equipment of the bioreactors. Maintaining a constant volumetric mass-transfer coefficient is a common scale-up strategy (Ozbek and Gayik, 2001). The oxygen mass transfer rate in a bioreactor depends on several factors, such as the geometry of the bioreactor (type of bioreactor, distributor or stirrer design, etc.…”

mentioning

confidence: 99%

Oxygen mass transfer studies on batch cultivation of P. aeruginosa in a biocalorimeter

Sivaprakasam¹,

Surianarayanan²,

Swaminathan³

2008

Electron. J. Biotechnol.

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Abbreviations: DO: dissolved oxygen OTR: oxygen transfer rate OUR: oxygen uptake rateIn the present work volumetric mass transfer coefficient (k L a) was investigated during batch cultivations of Pseudomonas aeruginosa on a nutrient media. The effects of process variables (viz. impeller speed, oxygen flow and geometry of impeller) on the volumetric mass transfer coefficient of oxygen, k L a, in a biocalorimeter (Bio-RC1) was investigated and reported in this research work. The experimental data have been analyzed employing MATLAB to obtain the influences of the process parameters on k L a. An attempt was made to correlate volumetric mass transfer coefficient with metabolic heat production rate at optimized process conditions. The correlation reported in this work would be useful to control and scale up of bioprocesses.

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“…Surface aerators are the most common reactors that are used almost universally for gas dispersion and reactions in biochemical, fermentation, and wastewater treatment industries [3][4][5] . Surface aeration will be defined as the aeration or oxygen transfer that takes place in the gas-liquid interface when the liquid is agitated, without the sparging of air.…”

Section: Introductionmentioning

confidence: 99%

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Rao¹,

Kumar²,

Patel³

2009

ScienceAsia

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Agitating liquids in an unbaffled surface aeration tank leads to the formation of a vortex in the region of the impeller shaft. The types and characteristics of the vortex govern the process phenomena of a surface aeration tank. In the present work, experimental results and empirical correlations have been obtained to relate the vortex depth to a number of physical factors. Experiments have been carried out on geometrically similar surface aeration systems, so that the present results can be simulated in the field conditions. The critical speed at which the vortex reaches the impeller has been estimated. It is found that around critical speed, there is an observable change in mass transfer characteristics, power used for mixing, and radius of the forced vortex zone. Equations for predicting vortex depth in geometrically similar surface aeration tanks have also been developed.

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The studies on the oxygen mass transfer coefficient in a bioreactor

Cited by 136 publications

References 27 publications

Mass Transfer in Multiphase Mechanically Agitated Systems

Mass Transfer in Multiphase Mechanically Agitated Systems

Oxygen mass transfer studies on batch cultivation of P. aeruginosa in a biocalorimeter

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