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Correlation between volumetric oxygen transfer coefficient and power requirement in citric acid fermentation by aspergillus niger


Citation

Hassan, Mohd Ali and Nik Sin, Nik Daud and Abdul Ghani, Baharuddin and Abdul Karim, Mohamed Ismail (1995) Correlation between volumetric oxygen transfer coefficient and power requirement in citric acid fermentation by aspergillus niger. Pertanika Journal of Tropical Agricultural Science, 18 (3). pp. 183-186. ISSN 0126-6128

Abstract / Synopsis

A batch culture system for the production of citric acid by Aspergillus niger TISTR 3089 was studied to determine the effect of aeration and mixing on the volumetric oxygen transfer coefficient (kLa) and power requirement. A 2-l batch stirred-tank was used with impeller speeds of500-900 -rpm at an aeration rate of 0.65 vvm with glucose as the carbon source. kLa and power consumption varied with duration offermentation. The data obtained were fitted to mathematical correlations between kLa and power requirement during gassing per unit volume of liquid (Pg/V) and superficial gas velocity reported by previous researchers. By including the agitator speed, better correlations were obtained, indicating the importance of stirrer speed in such correlations. The proposed relationship is: kLa = k (Pg/V)0.95 U0.67 N0.5, where U is the superficial gas velocity and N is the stirrer speed.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
Publisher: Universiti Putra Malaysia Press
Keywords: Volumetric oxygen transfer coefficient; Power requirement
Depositing User: Nasirah Abu Samah
Date Deposited: 25 Nov 2009 04:06
Last Modified: 04 Sep 2015 01:47
URI: http://psasir.upm.edu.my/id/eprint/3306
Statistic Details: View Download Statistic

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