Venturi aeration of bioreactors

 

Show simple item record

dc.contributor.advisor Harrison, STL en_ZA
dc.contributor.author Kadzinga, Fadzai en_ZA
dc.date.accessioned 2015-08-10T06:42:56Z
dc.date.available 2015-08-10T06:42:56Z
dc.date.issued 2015 en_ZA
dc.identifier.citation Kadzinga, F. 2015. Venturi aeration of bioreactors. Thesis. University of Cape Town ,Faculty of Engineering and the Built Environment ,Centre for Bioprocess Engineering Research. http://hdl.handle.net/11427/13675 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/13675
dc.description.abstract Low solubility of oxygen has resulted in high bioreactor energy requirements in order to supply sufficient oxygen to aerobic bioprocesses. It is desirable to reduce energy consumption in bioreactors to benefit environmental sustainability as well as economic feasibility. This is particularly important with the resurgence of interest in bio-based commodity products. Some research has suggested that venturi aeration of bioreactors will reduce energy consumption by eliminating the need for air compression, while at the same time maintaining or improving oxygen transfer rates. On the other hand, there are findings that suggest venturi aeration has lower energy efficiency than conventional sparging and oxygen transfer rates achieved are too low sustain aerobic biological processes. A comparison of the aeration of geometrically-similar reactors using the same analytical methods to determine kLa is not available in the literature. This comparison should also address analysis of energy input including energy used for compressing gas sparged into a stirred tank reactor; the investigation of mass transfer rates at higher flow rates (vvm) in venturi-aerated reactors and resulting cell response to these higher flow rates. This is the topic of the dissertation presented. In this laboratory scale study, venturi aerators were characterised and energy consumption as a function of oxygen mass transfer rates compared with a geometrically identical aerated stirred tank reactor by evaluating the volumetric mass transfer coefficients (kLa). The kLa was investigated in varying reactor setups using the dynamic gassing-in method. en_ZA
dc.language.iso eng en_ZA
dc.subject Bioprocess Engineering
dc.title Venturi aeration of bioreactors en_ZA
dc.type Master Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Engineering and the Built Environment
dc.publisher.department Centre for Bioprocess Engineering Research en_ZA
dc.type.qualificationlevel Masters
dc.type.qualificationname MSc (Eng) en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Kadzinga, F. (2015). <i>Venturi aeration of bioreactors</i>. (Thesis). University of Cape Town ,Faculty of Engineering and the Built Environment ,Centre for Bioprocess Engineering Research. Retrieved from http://hdl.handle.net/11427/13675 en_ZA
dc.identifier.chicagocitation Kadzinga, Fadzai. <i>"Venturi aeration of bioreactors."</i> Thesis., University of Cape Town ,Faculty of Engineering and the Built Environment ,Centre for Bioprocess Engineering Research, 2015. http://hdl.handle.net/11427/13675 en_ZA
dc.identifier.vancouvercitation Kadzinga F. Venturi aeration of bioreactors. [Thesis]. University of Cape Town ,Faculty of Engineering and the Built Environment ,Centre for Bioprocess Engineering Research, 2015 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/13675 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Kadzinga, Fadzai AB - Low solubility of oxygen has resulted in high bioreactor energy requirements in order to supply sufficient oxygen to aerobic bioprocesses. It is desirable to reduce energy consumption in bioreactors to benefit environmental sustainability as well as economic feasibility. This is particularly important with the resurgence of interest in bio-based commodity products. Some research has suggested that venturi aeration of bioreactors will reduce energy consumption by eliminating the need for air compression, while at the same time maintaining or improving oxygen transfer rates. On the other hand, there are findings that suggest venturi aeration has lower energy efficiency than conventional sparging and oxygen transfer rates achieved are too low sustain aerobic biological processes. A comparison of the aeration of geometrically-similar reactors using the same analytical methods to determine kLa is not available in the literature. This comparison should also address analysis of energy input including energy used for compressing gas sparged into a stirred tank reactor; the investigation of mass transfer rates at higher flow rates (vvm) in venturi-aerated reactors and resulting cell response to these higher flow rates. This is the topic of the dissertation presented. In this laboratory scale study, venturi aerators were characterised and energy consumption as a function of oxygen mass transfer rates compared with a geometrically identical aerated stirred tank reactor by evaluating the volumetric mass transfer coefficients (kLa). The kLa was investigated in varying reactor setups using the dynamic gassing-in method. DA - 2015 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2015 T1 - Venturi aeration of bioreactors TI - Venturi aeration of bioreactors UR - http://hdl.handle.net/11427/13675 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record