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  • 1
    Electronic Resource
    Electronic Resource
    Studies on transfer processes in mixing vessels: suspending of solid particles in liquid by modified Rushton turbine agitators (1996)
    Springer
    Bioprocess and biosystems engineering 15 (1996), S. 221-229 
    Details
    ISSN: 1432-0797
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The modified blade turbines are attractive alternatives to the standard Rushton turbine as they do not require any modification in the electrical engine motor and drive assemblies are simple to manufacture and have a reduced power consumption. The modified blades were obtained through increase in the blade height of the Rushton turbine simultaneously with perforation of the blade surface. The field surface of the modified blade is equal to the blade surface of the standard Rushton turbine. In this study the modified blade turbine with the surface fraction of the perforations equal to 0.353 is used. The complete suspension speed and the power dissipation in transition and turbulent regimes using standard and modified Rushton turbine agitators positioned singly or doubly on same shaft, in five solid-liquid systems were investigated. The solid particles used have the mean diameter between 15–1000 μm. The modified blade turbine, noted as TP3, was found to be more efficient than the standard turbine in complete and homogeneous suspension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369486
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hydrodynamics in external-loop airlift bioreactors with static mixers (1997)
    Springer
    Bioprocess engineering 16 (1997), S. 93-99 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Liquid circulation superficial velocity and gas holdup behaviours were investigated in an external-loop airlift bioreactor of 0.170 m3 liquid volume in gas-induced and forced-circulation-loop operation modes, in the presence of static mixers made of corrugated stainless steel pieces, resulting in packets with the height-to-diameter ratio equal to unity and using non-Newtonian starch solutions as liquid phase. The static mixers were disposed in the riser in three blocks, each with three mixing packets, successively turned 90° to the adjacent mixing element. It was found that in the presence of static mixers and forced-loop operation mode, liquid circulation superficial velocity in the riser section was significantly diminished, while gas holdup increased in a great measure. It was considered that static mixers split the fluid into individual streams and break up the bubbles, resulting in small bubble sizes with a relative homogeneous bubble distribution over riser cross section. They act as supplementary resistances in liquid flow, reducing riser cross sectional area, equivalent with A D /A R area ratio diminishing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490050294
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on transfer processes in mixing vessels: power consumption of the modified Rushton turbine agitators in three-phase systems (1997)
    Springer
    Bioprocess engineering 17 (1997), S. 307-316 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  In this work, the modified blade turbines, with the surface fraction of the perforations equal to 0.353, are used in the study of the relationship between the power consumption in three-phase systems and the superficial gas velocity, mixing intensity, agitator type, solid particles concentration, physical and rheological properties of the suspensions. The power consumption in three-phase mixing with modified turbines, single and double, is approximately 40% smaller than for the standard turbines at the same mixing intensity. The modified blade turbines are simple to manufacture and do not require any modification in electrical motor and drive assemblies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490050390
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Studies on transfer processes in mixing vessels: effect of gas on solid-liquid hydrodynamics using modified Rushton turbine agitators (1997)
    Springer
    Bioprocess engineering 17 (1997), S. 55-60 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of gas on solid-liquid hydrodynamics in mixing vessels was studied to determine the agitation speed required to just completely suspend all the particles under gassed conditions, N jsg and by measurement of the power consumption associated with this agitation speed. The solid particles have a mean diameter between 15–1000 μm. For their mixing are used standard and modified Rushton turbine agitators positioned singly or doubly on the same shaft. The modified turbine with a surface fraction of the perforations equal to 0.353 (TP3) was obtained through increase in the blade height of the Rushton turbine simultaneously with the perforation of the blade surface. The filled surface of the modified blade is equal to the blade surface of the standard Rushton turbine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490050353
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on transfer processes in mixing vessels: effect of particles on gas-liquid mass transfer using modified Rushton turbine agitators (1997)
    Springer
    Bioprocess engineering 17 (1997), S. 361-365 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The effect of suspended inert solid particles on gas-liquid mass transfer has been investigated in the vessels equipped with standard and modified Rushton turbine agitators positioned singly or doubly on same shaft. The relations between the volumetric mass transfer coefficient in various suspensions, specific power consumption and superficial gas velocity were obtained. Mixing with the modified Rushton turbines having the surface fraction of the perforations equal to 0.353, the oxygen transfer efficiency is over 45% higher than that obtained using standard Rushton turbines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490050398
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Studies on transfer processes in mixing vessels: suspending of solid particles in liquid by modified Rushton turbine agitators (1996)
    Springer
    Bioprocess engineering 15 (1996), S. 221-229 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  The modified blade turbines are attractive alternatives to the standard Rushton turbine as they do not require any modification in the electrical engine motor and drive assemblies are simple to manufacture and have a reduced power consumption. The modified blades were obtained through increase in the blade height of the Rushton turbine simultaneously with perforation of the blade surface. The field surface of the modified blade is equal to the blade surface of the standard Rushton turbine. In this study the modified blade turbine with the surface fraction of the perforations equal to 0.353 is used. The complete suspension speed and the power dissipation in transition and turbulent regimes using standard and modified Rushton turbine agitators positioned singly or doubly on same shaft, in five solid-liquid systems were investigated. The solid particles used have the mean diameter between 15–1000 μm. The modified blade turbine, noted as TP3, was found to be more efficient than the standard turbine in complete and homogeneous suspension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00369486
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Studies on transfer processes in mixing vessels: effect of particles on gas-liquid hydrodynamics using modified Rushton turbine agitators (1997)
    Springer
    Bioprocess engineering 16 (1997), S. 135-144 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  The work presents the effect of solid particles having a mean diameter between 15–1000 μm, on the gas dispersion in a mechanically agitated vessel with standard and modified Rushton turbine agitators positioned singly or doubly on same shaft. For the dispersing and uniform distribution of the three phase (gas-liquid-solid) through the entire vessel section, the modified blade turbines, with the surface fraction of the perforations equal to 0.353, were found to be more efficient, the power consumption being reduced by approximately 50%in comparison with the standard Rushton turbines. The power number in the turbulent mixing of the three phase system is dependent on the aeration rate, the surface fraction of the perforations, the turbine number and the physical and rheological properties of the suspensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004490050300
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    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Cultivation of a filamentous mould in an airlift bioreactor (1995)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 15 (1995), S. 323-335 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Cephalosporin C biosynthesis was investigated in a pilot-plant external-loop airlift bioreactor for evaluating the capacity of this bioreactor to surpass the problems which arise from the morphology of the mould and the rheology of the broth.Some of the results were compared with those obtained in a stirred tank bioreactor.The dilution and the use of static mixers was necessary to overcome the effects of the high viscosities. The oxygen transfer rate represented 84% of that in the stirred bioreactor, but the efficiency of the power utilization was higher.The specific productivity of Cephalosporin C is comparable to that obtained in the stirred tank bioreactor, but the average specific power consumption was found to be 2/3 of that in the stirred vessel.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370150402
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Application of an airlift bioreactor to the nystatin biosynthesis (1996)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 16 (1996), S. 303-314 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pilot plant studies were performed using a concentric-tube airlift bioreactor of 2.5 m3 fermentation volume. The results have proven the relative merits of such a system in the biosynthesis of nystatin, produced by Streptomyces noursei, in submerged aerobic cultivation and batch operation mode. The results were compared to those obtained in a pilot-scale stirred tank bioreactor of 3.5 m3 fermentation volume.The fermentation processes in the two fermentation devices were similar with respect to substrate utilization, biomass production and nystatin biosynthesis.In the riser section, the dissolved oxygen concentration was higher than that in the downcomer.The volumetric oxygen mass transfer coefficient was dependent on the rheological behaviour of the biosynthesis liquids, which was not constant during the fermentation process.The total energy consumption for nystatin production in the airlift bioreactor was 56% of that in the stirred tank, while the operating costs represented 78% of those in the stirred tank bioreactor.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370160413
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Mixing times in an external-loop airlift bioreactor with static mixers (1996)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 16 (1996), S. 145-153 
    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 influence of static mixers on mixing time and circulation time in an external-loop airlift bioreactor with gas-induced and forced-liquid circulation was investigated.The study was carried out with water and three viscous, non-Newtonian starch solutions. The mixing time was determined for the overrall flow loop using a classical tracer response technique.It was found that the mixing time is highly dependent on the superficial gas velocity and the presence of static mixers. The shortest mixing time is achieved in a forced-loop airlift reactor without static mixers, where the average mixing time value is only 1/3 of the time necessary for mixing in the airlift reactor with gas-induced liquid circulation and static mixers.The pseudoplasticity of the liquid phase insignificantly influences the mixing time and the circulation time.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370160208
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    Paper (German National Licenses)
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