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Mass Transfer Characteristics of a Fermentation Broth and ─░nvestigation of Bacillus amyloliquefaciens Growth in a Cocurrent Downflow Contacting Reactor (CDCR)

[ Vol. 7 , Issue. 4 ]


Ramazan Orhan* and Gulbeyi Dursun   Pages 293 - 300 ( 8 )


Aim: In this study, the hydrodynamic behavior and mass transfer characteristics of a cocurrent down flow contacting reactor (CDCR) were investigated for air-tap water and airfermentation broth systems.

Observation: As gas and liquid flow rates increased, the values of kLa and gas hold ups increased. The values of kLa measured in the air-fermentation broth system were all lower than those in the air-tap water system, but the values of gas hold up were higher.

Result: Bacillus amyloliquefaciens bacterial was grown in a medium of 10 g L-1 glucose and the specific growth rate, maximum dry cell concentration, and yield of biomass on glucose were determined to be 0.310 h-1, 5.0 g dry cell L-1, 0.500 g dry cell g-1 glucose, respectively.

Conclusion: The values of kLa and qO2, increased at active growth phase and then decreased with decreasing active cells.


B. amyloliquefaciens, mass transfer, kLa, qO2, fermentation, matrix.


Department of Chemical Engineering, Firat University, Elazig, Department of Chemical Engineering, Firat University, Elazig

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