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  • 1
    Electronic Resource
    Electronic Resource
    Modelling of the calculation of the power input for aerated single- and multistage impellers with special respect to scale-up (1990)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 10 (1990), S. 215-224 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: For both laboratory and industrial scale fermenters the stirred fermenter is often being used. Especially for the design procedure of industrial fermenters with variable speed drive it is important to know the exact power characteristics for single and multiple impellers. The calculation procedure used for estimating the gassed power input gives the possibility to calculate the gassed power drawn by at maximum 3 impellers in vessels up to 3.5 m in diameter in aerated water. For calculation one only needs known parameters. This power input is valid for low and medium viscous fermentation broths too because especially after the addition of antifoam agents the properties of the liquid phase are then comparable to water as a coalescing liquid. It is possible to calculate the gassed power drawn by each impeller of a multiple system. This calculation procedure is applicable to different fermentation broths where in the range of low aeration rates the results differ from those for water.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370100302
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vergleich von Messungen des kLa-Wertes nach der stationären und der dynamischen Methode bei der Fermentation von L-Lysin und Turimycin (1984)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 4 (1984), S. 235-245 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The calculation and scale-up of fermentation processes need kLa as one of the most important engineering data. There are two methods to determine kLa depending on power input, aeration rate and the properties of the fermentation broth: static with a balance between air supply and exit, dynamic gassing out with following the changes of dissolved oxygen concentration during periods of air off and a following air on.Within early intervals of fermentation time the data from both methods agree well, while for later time intervals the dynamic method always gives much lower values for kLa than static. The only explanations for this phenomenon are quick changes in the oxygen metabolism or an enzymatic storage of oxygen. For both gassing out and saturation period it is possible to calculate the same absolute amounts of this additional oxygen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370040304
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The optimization of L-lysine fermentation and a mass transfer model (1984)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 4 (1984), S. 355-360 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The efficiency of L-lysine biosynthesis is essentially determined by the power input and aeration ratio in the stirred fermenter.A mass transfer model was developed by means of the results of lysine fermentations in four geometrically similar fermenters with working volumes of 10 1, 50 1, 100 1 and 2500 1 which allows the optimization of lysine fermentation from the energetical point of view. The usefullness of this kLa-model is demonstrated with an example where the power input for an unknown fermenter is calculated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370040410
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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