Improvement of fermentation performance of Gluconobacter oxydans by combination of enhanced oxygen mass transfer in compressed-oxygen-supplied sealed system and cell-recycle technique

2017 ◽  
Vol 244 ◽  
pp. 1137-1141 ◽  
Author(s):  
Xin Zhou ◽  
Xuelian Zhou ◽  
Yong Xu
Keyword(s):  
Mass Transfer ◽  
Gluconobacter Oxydans ◽  
Oxygen Mass Transfer ◽  
Fermentation Performance ◽  
Cell Recycle

scholarly journals Two-Phase Flow Mass Transfer Analysis of Airlift Pump for Aquaculture Applications

Fluids ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 226
Author(s):  
Rashal Abed ◽  
Mohamed M. Hussein ◽  
Wael H. Ahmed ◽  
Sherif Abdou
Keyword(s):  
Mass Transfer ◽  
Oxygen Transfer ◽  
Transfer Rate ◽  
Two Phase Flow ◽  
Oxygen Transfer Rate ◽  
Flow Patterns ◽  
Oxygen Mass Transfer ◽  
Phase Flow ◽  
Two Phase ◽  
Airlift Pump

Airlift pumps can be used in the aquaculture industry to provide aeration while concurrently moving water utilizing the dynamics of two-phase flow in the pump riser. The oxygen mass transfer that occurs from the injected compressed air to the water in the aquaculture systems can be experimentally investigated to determine the pump aeration capabilities. The objective of this study is to evaluate the effects of various airflow rates as well as the injection methods on the oxygen transfer rate within a dual injector airlift pump system. Experiments were conducted using an airlift pump connected to a vertical pump riser within a recirculating system. Both two-phase flow patterns and the void fraction measurements were used to evaluate the dissolved oxygen mass transfer mechanism through the airlift pump. A dissolved oxygen (DO) sensor was used to determine the DO levels within the airlift pumping system at different operating conditions required by the pump. Flow visualization imaging and particle image velocimetry (PIV) measurements were performed in order to better understand the effects of the two-phase flow patterns on the aeration performance. It was found that the radial injection method reached the saturation point faster at lower airflow rates, whereas the axial method performed better as the airflow rates were increased. The standard oxygen transfer rate (SOTR) and standard aeration efficiency (SAE) were calculated and were found to strongly depend on the injection method as well as the two-phase flow patterns in the pump riser.

Influence of pluronic F68 on oxygen mass transfer

2013 ◽  
Vol 29 (5) ◽  
pp. 1278-1288 ◽  
Author(s):  
Christian Sieblist ◽  
Marco Jenzsch ◽  
Michael Pohlscheidt
Keyword(s):  
Mass Transfer ◽  
Oxygen Mass Transfer ◽  
Pluronic F68

Oxygen mass transfer in three-phase fluidized beds working at large flow rates

1983 ◽  
Vol 61 (1) ◽  
pp. 58-63 ◽  
Author(s):  
M. Alvarez-Cuenca ◽  
C. G. J. Baker ◽  
M. A. Bergougnou ◽  
M. A. Nerenberg
Keyword(s):  
Mass Transfer ◽  
Fluidized Beds ◽  
Oxygen Mass Transfer ◽  
Flow Rates ◽  
Three Phase ◽  
Large Flow

Optical determination of oxygen mass transfer in a helically-coiled pipe compared to a straight horizontal tube

2018 ◽  
Vol 190 ◽  
pp. 273-285 ◽  
Author(s):  
P. Kováts ◽  
D. Pohl ◽  
D. Thévenin ◽  
K. Zähringer
Keyword(s):  
Mass Transfer ◽  
Horizontal Tube ◽  
Oxygen Mass Transfer ◽  
Optical Determination
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