scholarly journals Retracted: Oxygen Mass Transfer in an Aerated Stirred Tank with Double Impellers: A Generalized Correlation Including Spacing Impact

2017 ◽  
Vol 2017 ◽  
pp. 1-1
Keyword(s):  
Mass Transfer ◽  
Stirred Tank ◽  
Oxygen Mass Transfer ◽  
Generalized Correlation

Optical Approach for Measuring Oxygen Mass Transfer in Stirred Tank Bioreactors

2017 ◽  
Vol 15 (4) ◽  
Author(s):  
Jorge Isaac Martínez-Corona ◽  
Rubén Rogelio Cisneros-Garza ◽  
Felipe Robledo-Padilla ◽  
Roberto Parra-Saldívar ◽  
Andrés Sebastián Treviño-Martínez ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Bubble Diameter ◽  
Real Life ◽  
Digital Camera ◽  
Close Correlation ◽  
Stirred Tank ◽  
Oxygen Mass Transfer ◽  
Stirred Tank Bioreactor ◽  
Sensing Systems ◽  
And Control

Abstract Bioreactor engineering allows modeling the conditions of real life biological processes. Particularly, oxygen represents one of the most important factors for life, and the understanding and control of its mass transfer in bioreactors is one of the most challenging problems in the industry. The aim of this study was to develop an optical approach for measuring the oxygen mass transfer coefficient (kLa). An assembly was constructed for this purpose, consisting of a stirred tank bioreactor, a high-intensity light source, a luminometer and a digital camera. Air flux supply and stirring velocity of the bioreactor were tested over a range of thirty-five values. The air bubbles generated were counted and their diameters were measured from photographs. The luminometer measured light obstruction due to bubbles. A polarography electrode sensor measured the dissolved oxygen in water to correlate it with the optical approach. The results showed a close correlation between kLa and light obstructed due to bubbles of air. The bubble diameter and holdup results suggest that the size of the bubbles decreases and becomes more homogeneous as stirring speed increases. A multivariable linear model for kLa as a function of the measured light obstruction and air flux injection was constructed. A strong correlation between this model and results was obtained. This approach avoids the need for chemical sensors for sensing systems, with a noninvasive and nondestructive methodology to determine the kLa for dilute solutions. This technique could be developed to evaluate a scaled-up bioreactor before running a bioprocess.

Kinetic, oxygen mass transfer and hydrodynamic studies in a three-phase stirred tank bioreactor for the bioconversion of (+)-valencene on Yarrowia lipolytica 2.2ab

2016 ◽  
Vol 113 ◽  
pp. 37-46 ◽  
Author(s):  
D.M. Palmerín-Carreño ◽  
C.O. Castillo-Araiza ◽  
O.M. Rutiaga-Quiñones ◽  
J.R. Verde-Calvo ◽  
S. Huerta-Ochoa
Keyword(s):  
Mass Transfer ◽  
Yarrowia Lipolytica ◽  
Stirred Tank ◽  
Oxygen Mass Transfer ◽  
Stirred Tank Bioreactor ◽  
Three Phase

scholarly journals Oxygen Mass Transfer in an Aerated Stirred Tank with Double Impellers: A Generalized Correlation Including Spacing Impact

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Hayder Mohammed Issa
Keyword(s):  
Mass Transfer ◽  
Food Industry ◽  
Oxygen Mass Transfer ◽  
Biological Processes ◽  
Industrial Equipment ◽  
Correlation Model ◽  
Design Factor ◽  
Dependent Parameter ◽  
Pharmaceutical Production ◽  
Generalized Correlation

Stirred aerated tanks by double impellers are used in fermentation and various biological processes for water treatment, food industry, and pharmaceutical production. In this study, a generalized correlation model was developed for the dependent parameter (kla/N). The oxygen mass transfer from air to liquid takes place by rotating the double impellers (IBRC and PBPU) in the aerated tank. This model considers Reynolds number, Froude number, power number, the liquid height, and the spacing between impellers as the most significant specifications that are related to aerated tank performance. The spacing between the impellers is considered to be a design factor of such industrial equipment due to its remarkable impact on the oxygen mass transfer.

Hydrodynamic and oxygen mass transfer studies in a three-phase (air–water–ionic liquid) stirred tank bioreactor

2009 ◽  
Vol 45 (3) ◽  
pp. 209-217 ◽  
Author(s):  
D. Torres-Martínez ◽  
R. Melgarejo-Torres ◽  
M. Gutiérrez-Rojas ◽  
L. Aguilera-Vázquez ◽  
M. Micheletti ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Ionic Liquid ◽  
Stirred Tank ◽  
Oxygen Mass Transfer ◽  
Stirred Tank Bioreactor ◽  
Three Phase ◽  
Mass Transfer Studies
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