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- W2085403940 abstract "The specific aspects of airlift reactors emphasizing their function relevance to particular application as bioreactors are presented. The two main groups of airlift reactors – external-loop and concentric-tube reactors – were investigated on a pilot-plant scale with regard to their performance during the cultivation of unicellular and filamentous microorganisms which produce Bacitracin, Cephalosporin C and Nystatin. Some results were compared to those obtained in conventional stirred tank bioreactors. The comparison was carried out based on physical properties (oxygen transfer rate (OTR), volumetric mass transfer coefficient (kLa) and efficiency of oxygen transfer (E)), cell mass, productivity and substrate consumption, secondary metabolite production, and efficiency of the product formation with regard to the specific power input. It was shown that B. licheniformis, C. acremonium and S. noursei fermentations occurred similarly to those performed in stirred vessels, proving that the capacity of the airlift bioreactors surpassed the problems which arise from the morphology and rheology of the broths. From the chemical engineering point of view, it was obvious that the primary tasks of a bioreactor (uniform distribution of microorganisms and nutrients over the entire fermenter volume, appropriate supply of biomass with nutrients and oxygen) were fulfilled by the airlift bioreactors tested. In addition, the efficiency of oxygen transfer (OTR referred to power input) in the airlift fermenters proved to be about 38% higher than in the stirred tank bioreactors (expressed as average values), while the sorption efficiency (OTR referred to antibiotic production) was found to be 22% greater in the airlift system than in an STR. Therefore, the biosyntheses were performed with about a 30–40% increase in energy efficiency and energy savings compared to the conventional system. Moreover, the lack of mechanical devices in the airlift system provides greater safety and a gentler environment for the cultivation of microorganisms." @default.
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- W2085403940 date "1998-01-01" @default.
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- W2085403940 title "Performance of airlift bioreactors in the cultivation of some antibiotic producing microorganisms" @default.
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- W2085403940 doi "https://doi.org/10.1002/abio.370180304" @default.
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