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Browsing PhD / Doctoral by Department "Centre for Bioprocess Engineering Research"

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A Comparative Analysis of the Performance and the Microbial Ecology of Biological Sulphate Reducing Reactor Systems

Author: Hessler, Tomas Date: 2020 Acid rock drainage (ARD) is defined as acidic waste-water contaminated with sulphate and heavy metals which is generated through the oxidation of sulphidic ores in the presence of water and oxygen. Mining activities accelerate this process ... Read more
A novel semi-passive process for sulphate removal and elemental sulphur recovery centred on a hybrid linear flow channel reactor

Author: Marais, Tynan S Date: 2020 South Africa (SA) currently faces a major pollution problem from mining impacted water, including acid rock drainage (ARD), as a consequence of the mining activities upon which the economy has been largely built. The environmental impact of ... Read more
An investigation into the fundamental understanding of an activated sludge bioremediation process and optimisation of thiocyanate and cyanide destruction

Author: van Zyl, Andries Wynand Date: 2019 Cyanide (CN) is used in the gold mining industry to dissolve gold from free milling, complex and refractory gold containing ores. Processing sulphide containing refractory ores using biooxidation as a pre-treatment has become increasingly ... Read more
Analysis of particle suspension and mixing in biological systems : an application of tomography

Author: Stevenson, Ryan Date: 2006 Includes bibliographical references. Read more
Biocatalytic studies of phenol oxidases producing antioxidants

Author: Ncanana, Sandile Welcome Date: 2007 In recent years there has been increasing interest in the production of oligomers and polymers of economic importance using biocatalysts; the application of enzymes in dimerisation or polymerisation processes can lead to the synthesis of ... Read more
A detailed investigation of microbial cell disruption by hydrodynamic cavitation for selective product release

Author: Bangaru, Balasundaram Date: 2004 Hydrodynamic cavitation is a novel method for microbial cell disruption, mediated by intense pressure fluctuations caused by cavity oscillation and collapse. Selective release of intracellular microbial products is desirable to reduce the ... Read more
Developing quantitative approaches to determine microbial colonisation and activity in mineral bioleaching and characterisation of acid rock drainage

Author: Makaula, Didi Xhanti Date: 2019 Colonisation of mineral surfaces by acidophilic microorganisms during bioleaching is important for accelerating the extraction of valuable metals from mineral sulfide ores of varying grades through biohydrometallurgy. It also influences acid ... Read more
Development of a computationally efficient bubble column simulation approach by way of statistical bubble micro-flow modelling

Author: Coetzee, Waldo Date: 2013 The intimate contact achieved between the gas and liquid phases in bubble columns, coupled with the inherent efficient mixing these reactors offer, yield excellent heat and mass transfer characteristics. These attributes have been exploited ... Read more
Development of an unsteady state model for the tank bioleaching of sulphide mineral concentrates in flow reactor systems

Author: Kotsiopoulos, Athanasios Date: 2012 In this thesis, it is hypothesized that in bioleaching flow reactor systems, high reaction rate regions exist that can be maintained by application of biological stress trajectories. Reactor models are developed for the purpose of optimising ... Read more
The effect of non-biological particulates on microbial cell disruption in a slurry bioreactor

Author: Scholtz, Nicola Jeanne Date: 1998 Cell damage from hydrodynamic stress is an important consideration in biological systems since it can result in the growth and function of the cell becoming impaired (Toma et al. 1991, Lilly et al. 1992). In the extreme case of cell damage, ... Read more
The effect of particulate-induced hydrodynamic stress on the bioleaching of chalcopyrite by a Sulfolobus sp.

Author: Raja, Sashnee B Date: 2005 In slurry reactors, hydrodynamic stress originates primarily from interactions between particles and cells in the reactor. This form of stress has been shown to negatively affect the process performance. The present study centres on slurry ... Read more
The effects of solution conditions on the kinetics of microbial ferrous-iron oxidation by Leptospirillum ferriphilum in continuous culture

Author: Ojumu, Tunde Victor Date: 2008 The objective of this work was to investigate the effects of a wide range of solution conditions,namely: temperature, pH, dissolved Al and Mg, and the effect of total iron concentration on the kinetics of microbial ferrous-iron oxidation by ... Read more
Enhanced bioethanol fermentation from mixed xylose and glucose using free and immobilized cultures: mathematical model and experimental observation

Author: Ghods, Nosaibeh Nosrati Date: 2019 Bioethanol plays a significant role in the world of liquid biofuel. However, majority of bioethanol is produced from edible food crops such as corn and sugarcane that causes an increase in demand for vacant lands for food production and, ... Read more
Exploring the factors at play to make wastewater biorefineries a reality

Author: Verster, Bernelle Date: 2019 This thesis concerns the topic of wastewater biorefineries (WWBR), in which wastewater is not seen simply as a waste stream to be cleaned but as a valuable material flow to be converted into bioproducts, while still meeting discharge limits ... Read more
A generic approach to environmental assessment of microbial bioprocesses through life cycle assessment (LCA)

Author: Harding, Kevin Date: 2008 The intrinsic environmental advantages of industrial scale bioprocesses over chemical processes remain a discussion point owing to limited objective analysis. Studies to date are often limited to energy or global warming considerations with ... Read more
Influence of enzyme location and culture rheology on glucose oxidase production and recovery by Aspergillus niger NRRL-3 and Penicillium sp. CBS120262 Madelyn Johnstone-Robertson.

Author: Johnstone-Robertson, Madelyn Date: 2012 The aim of this thesis is to establish and understand the location of glucose oxidase (GO) in fungi Aspergillus niger NRRL-3 and Penicillium sp. CBS120262 to inform the enzyme recovery. GO was chosen to be a model system and the outcomes ... Read more
Investigating red pigment production by Penicillium purpurogenum DSM 62866

Author: Horn, Caryn Date: 2022 The production of a diverse range of pigments with variable properties and application potential highlights filamentous fungi as potential sources of pigments in the consumer-driven move toward natural colourant alternatives in food, cosmetic ... Read more
Investigation into the bioremediation and benefication of olive-derived wastewaters from the Western Cape

Author: Garcin, C J Date: 2005 Since this was the first research project into olive wastewaters produced in South Africa, the scope of the project was broad, and recommendations were made for further research in several directions. Most importantly, the development of ... Read more
An investigation of cyanide-based heap leaching for extracting precious metals from Platreef ore

Author: Mwase, James Malumbo Date: 2016 Cyanide heap leaching had been proposed as an alternative to the classic crush-mill-loatsmelt-refine route for processing platinum group metals (PGMs) from the Platreef ore body. Overall the process includes two stages of leaching. The first ... Read more
Investigation of microbial metal-sulfide interfacial environments under mineral bioleach simulated conditions

Author: Africa, Cindy-Jade Date: 2017 This research pertains to bioleaching of copper containing ores with particular reference to the copper sulfide mineral chalcopyrite (CuFeS2). While it is focused on heap bioleaching, it has applications to stirred tank bioleaching operations. ... Read more

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