Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 150 for “"Centre for Bioprocess Engineering Research"”.
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Integrating Microbial Fuel Cells (MFCs) into the treatment of sulphate-rich wastewater
… of laboratory scale Microbial Fuel Cells (MFCs) for the combined generation of electricity and the treatment of wastewater has been well documented in literature. In addition to this the integration of MFCs into wastewater treatment reactors has also been shown to have several benefits. These …
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Techno-Economic Evaluation of a Commercial c-Phycocyanin Extraction Process
… platensis (Spirulina), a cyanobacterium known for its relatively economical and easy cultivation, is a popular source for the production of cPC. The Centre for Bioprocess Engineering Research (CeBER) at the University of Cape Town (UCT) has patented a novel process for extracting and purifying …
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Biolistic-mediated transformation of Eragrostis Curvula with the HSP 12 gene
… plant and an economically important forage grass in southern Africa. This species has a potential to be improved for drought and salt resistance among other important agronomic traits. In this study, E. curvula was used as a model system to explore the feasibility of producing pasture …
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Image analysis of Bacillus thuringiensis
… inaccuracies that resulted in manual counts performed by different people. Bacillus thuringiensis is a spore forming, gram-positive bacterium, which produces both intracellular spores and insecticidal protein crystals. The production of the insecticidal protein crystal makes Bacillus …
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Investigating variables affecting heap (bio)leaching through determining access to sub-surface mineral grains by micro-scale X-ray tomography
… solution with mineral grains is necessary for oxidation of the sulphide minerals. However, a large fraction of the mineral grains is positioned below the surface of the ore particles and so contact with the liquid occurs through cracks and pores in the ore connected to the surface. Long …
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Biocatalytic studies of phenol oxidases producing antioxidants
… of bioremediation systems, and there is a demand for new technologies that can be utilized in the removal of organic pollutants such as phenolics from contaminated environment. This study reports on the potential application of laccase, obtained from the white rot fungi Trametes pubescens, in the …
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On the progression of leaching from large particles in heaps
… of the underlying fundamental processes for optimisation to take place...The subject of this research was, therefore, to understand more clearly the diffusion reaction phenomena of reagents through large particles and to provide true and reliable physical parameters to formulate the …
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Anaerobic digestion of algal biomass for bioenergy production- a feasibility study
… of using algal biomass as a feedstock for AD.
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An investigation into the mechanism of bioleaching of a predominantly-chalcopyrite concentrate with mesophiles
Bioleaching is an established technology for the treatment of refractory gold ores and concentrates. The bioleaching of sulphide minerals is a complex process in which bacterial and chemical oxidation processes occur simultaneously. Recent studies has provided convincing evidence that the …
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An approach of compartmentalisation in development of non-isothermal chemical reactor network models for the high speed simulation of iso-octane combustion
… A chemical reactor network (CRN) is proposed for the simulation of the combustion of iso-octane. The compartmentalisation of a combusting system involves proposing a reactor network based on the flow fields predicted by computational fluid dynamics (CFD). The first step in the development of …
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An investigation into the ferric leaching of chalcopyrite : a sub-process in the bioleaching of chalcopyrite
The current focus of research in the UCT Minerals Bioprocessing Research Unit is to develop an understanding of the chalcopyrite bioleaching sub-processes. This thesis forms part of the greater study on bioleaching, investigating the ferric leaching subprocess. The objective of this thesis was …
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The effect of carbon dioxide on the growth and activity of leptospirillum ferriphilum
Microbial oxidation rates catalysed by the acidophilic micro-organisms mediating mesophilic and thermophilic bioleaching of mineral sulphides have been well characterised under conditions typical of active tank leaching processes in the mineral industry. However, with the increasing need to …
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Carbon dioxide mass transfer within algal raceway ponds and the potential for improvement using slopes to create wave
… has the potential to be extremely useful for the production of a wide range of products or for specific processes, such as capture and cycling of CO₂. The fast micro-algal growth rates and ability to grow on agriculturally poor land and in waste water means that bio-production using algae …
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Evaluation of the Redostat™ device for the study of ferrous iron biological oxidation kinetics.
… is an established metallurgical route for the recovery of copper from low grade sulphide ores and pretreatment of refractory gold bearing sulphides. However, metal recovery is generally low (80 to 85% copper recovery is achieved in about a year) due to the slow heap bioleaching …
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Potential of thermophilic bioleaching, effect of temperature on the process performance
… the system. Hence, the objectives of the present research were established as follows: to elucidate the effect of temperature on mass transfer from a theoretical point of view to establish whether ionic speciation is a contributing factor in thermophilic bioleaching to develop a generic and …
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Interrelationship of hydrology, microbial colonisation and hydrometallurgy in a simulated chalcopyrite heap leach
… worldwide. As copper grades of ores available for extraction decrease, heap bioleaching is gaining interest as a potential operating alternative to traditional methods of roasting and smelting. The efficiency by which bacteria assist leaching chalcopyrite is governed by their interaction and …
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A Comparative Analysis of the Performance and the Microbial Ecology of Biological Sulphate Reducing Reactor Systems
… has long been considered an attractive option for the longterm remediation of these low-volume sources of ARD – but its implementation has shown mixed success. BSR is a process catalysed through the innate metabolism of sulphate-reducing bacteria (SRB) which coexist within complex microbial …
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Application of mineralogy in the interpretation of laboratory scale acid rock drainage (ARD) prediction tests : a gold case study
… that when exposed to air and water react to form acid, which results in acid rock drainage (ARD). ARD is usually associated with low pH, high sulfate content and elevated concentrations of toxic elements. The mobility of ARD affects our scarce water resources, land and aquatic species. …
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Effects of hydrodynamic stress on growing Saccharomyces cerevisiae in a slurry reactor
The objectives of this research thesis were to understand and quantify biological responses to hydrodynamic stress by investigating the activity of the yeast Saccharomyces cerevisiae, cultivated in the presence of a range of solid loadings, solid sizes and agitation rates. The influence of inoculum …
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Removal of zinc from a base-metal solution using ion exchange at Rustenburg Base Metal Refiners.
… nickel cathode, thus making it the major bleed for zinc from the circuit. The expansion circuit mass balance showed that although a portion of the zinc would exit through the pressure iron removal residue, this small bleed stream would not be sufficient to ensure that the nickel cathode does not …
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