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 151 for “"Bioprocess Engineering Research"”.
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Integrating Microbial Fuel Cells (MFCs) into the treatment of sulphate-rich wastewater
… being investigated within the Centre for Bioprocess Engineering Research (CeBER) (van Hille et al., 2015). This research involves the use of a Linear Flow Channel Reactor (LFCR) designed for combined biological sulphide reduction and sulphide oxidation to yield a sulphur product. Sulphate …
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Predicting the time related generation of acid rock drainage from mine waste: a copper case study
The mining and beneficiation of coal and hard rock ores generates large volumes of sulphidic waste that may oxidise in the presence of oxygen and result in the generation of acid rock drainage (ARD). In order to effectively manage the long term effects of ARD, there is a need to reliably quantify …
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Techno-Economic Evaluation of a Commercial c-Phycocyanin Extraction Process
… 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 cPC from Spirulina (Fagan-Endres et al., 2019). A manufacturer of raw materials for the cosmetics and consumer …
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Enhancing CO2 mass transfer in large scale algal raceway ponds through wave generation
… slopes is being investigated by the Center for Bioprocess Engineering Research (CeBER) at the University of Cape Town. This contributes to the ongoing investigation into the use of carbon sequestering organisms as a means of producing valuable compounds. The growth rate of algae has presented a …
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Purification of C-phycocyanin from Spirulina - adsorption pretreatment options
… protein. Work was done at the Centre for Bioprocess Engineering Research (CeBER) to develop a process using aqueous two-phase separation (ATPS) and ammonium sulfate precipitation to generate C-PC for cosmetic use, which has a minimum purity requirement of 1.5. A patent was obtained before …
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Biolistic-mediated transformation of Eragrostis Curvula with the HSP 12 gene
Eragrostis curvula is a desiccation sensitive monocotyledonous 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 …
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Image analysis of Bacillus thuringiensis
This thesis concerns the development of a method to quantify the morphology of the bacterium Bacillus thuringiensis, and to automatically count the bacteria. The need to quantify the bacterial morphology arose out of the possibility of controlling a fermentation based on the morphology of the …
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Investigating variables affecting heap (bio)leaching through determining access to sub-surface mineral grains by micro-scale X-ray tomography
Heap bioleaching is a hydrometallurgical technology, used to facilitate the extraction of valuable metals such as copper, gold, nickel and uranium from low-grade, typically sulphidic, ores. The process is highly complex as it is influenced by interactions of different sub-processes including flow …
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Biocatalytic studies of phenol oxidases producing antioxidants
… dimers or polymers, and in the development of bioprocesses of potential economic importance. The focus of this study is, particularly, on the effect of organic solvents and the structure of the substrates on the nature of products formed. The thesis also gives some insight into the relationship …
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On the progression of leaching from large particles in heaps
… 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 relevant modelling approaches to large particle leaching. …
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Anaerobic digestion of algal biomass for bioenergy production- a feasibility study
AD technology is well developed, cost efficient and can be easily implemented in developing countries. Biogas production has become a very topical subject, with many European nations introducing initiatives to increase biogas production. AD of algal biomass was studied in detail during the 1980’s, …
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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
Every aspect of the modern day life relies on combustion, be it in motor vehicles, industrial equipment or power generation. The downside to the extensive use of combustion technology is the environmental pollution produced by the process. The lack of fast solving models to simulate combustion …
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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
The growth of microalgae 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 …
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Evaluation of the Redostat™ device for the study of ferrous iron biological oxidation kinetics.
Heap bioleaching 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
Chalcopyrite is the most abundant primary copper sulphide mineral found 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 …
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A Comparative Analysis of the Performance and the Microbial Ecology of Biological Sulphate Reducing Reactor Systems
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 by bringing these ores to the surface where they are …
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