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Browsing PhD / Doctoral by Faculty "Faculty of Engineering and the Built Environment"

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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 complex transdisciplinary exploration of South African climate mitigation policy

Author: Tyler, Emily Date: 2019 The research journey reflected in this thesis emerged from fifteen years of practice of (predominantly South African) climate mitigation policy from 2001 - 2016; from a dissatisfaction with the pace and depth of progress, and a realisation ... Read more
A contact-implicit direct trajectory optimization scheme for the study of legged maneuverability

Author: Shield, Stacey Date: 2022 For legged robots to move safely in unpredictable environments, they need to be manoeuvrable, but transient motions such as acceleration, deceleration and turning have been the subject of little research compared to constant-speed gait. They ... Read more
A framework for guiding cadastral systems development in customary land rights contexts

Author: Hull, Simon Date: 2019 Land reform in South Africa is reported to be failing, and land tenure reform in customary contexts is the least well-addressed component of land reform. To address this failure, a framework for guiding cadastral systems development in customary ... Read more
A Higher-Order VOF Interface Reconstruction Scheme for Non-Orthogonal Structured Grids - with Application to Surface Tension Modelling

Author: Ilangakoon, Niran A Date: 2021 The volume-of-fluid (VOF) method [24] is widely used to track the interface for the purpose of simulating liquid-gas interfacial flows numerically. The key strength of VOF is its mass conserving property. However, interface reconstruction is ... Read more
A Historical Institutionalist Analysis of the Evolution of South Africa's Municipal Electricity Sector within the Broader Electricity Supply Industry

Author: Covary, Theodore Date: 2020 This study has been partly inspired by the fact that historical narratives on the evolution of the South African Electricity Supply Industry (ESI), have for the most part focused on the national vertically integrated utility, Eskom; with far ... Read more
A methodology for integrated thermofluid modelling of radiant superheaters in steady state and transient operations

Author: Gwebu, Excellent Zibhekele Date: 2019 Critical components in coal-fired power plants such as final superheater heat exchangers experience severe conditions associated with high metal temperatures and high temperature gradients during base load and transient operations. Such adverse ... Read more
A methodology to investigate the cause of quenching in once-through tower type power plant boilers

Author: De Klerk, Gary Date: 2020 Due to the penetration of variable renewable energy (VRE) sources, conventional coal fired power plants need to operate with greater flexibility via two-shifting or low load operation whilst remaining reliable and conserving the lifetime of ... Read more
A multifarious comparative ecotoxicological approach on a catchment scale from three mine wastelands for improved environmental management and risk assessment: integrating abiotic, biotic and agroecosystem approaches

Author: Mudenda, Lee Date: 2022 Metal mobilization under acid or neutral rock drainage represents one of the major environmental impacts associated with mining of sulphidic minerals. To avert this, suitable handling of mine overburden material, waste rock, open pits and ... 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
A Precision Experiment for the Deformation and Fracture of Blast Loaded Plates

Author: Cloete, Trevor John Date: 2022 The purpose of this thesis is to present a novel laboratory scale precision test [1] apparatus, developed specifically to study of the deformation and fracture of blast loaded plates. A review of published laboratory scale blast testing showed ... Read more
A prototype dynamic model for the co-treatment of a high strength simple-organic industrial effluent and coal-mine drainage

Author: Harding, Theodor Date: 2020 This research study's the use of biological sulfate reduction technologies for the treatment of Sasol Secunda's coal-mine drainage (CMD) using Fischer-Tropsch Reaction Water (FTRW) as a cost-efficient carbon source. The research aims to develop ... Read more
A study of impact breakage of single rock specimen using discrete element method

Author: Oladele, Temitope Philip Date: 2020 Comminution is a critical stage of mineral processing which aims to reduce the size of ore particles through breakage, consequently increasing the likelihood of the liberation of valuable minerals. However, comminution is highly energy-intensive ... Read more
A study of the charge structure and energy utilisation in a Stirred Media Detritor using DEM-SPH

Author: Ndimande, Conrad B Date: 2022 The Stirred Media Detritor, (SMD), is a grinding device used for fine and ultra-fine grinding applications in mineral processing. The SMD has a vertically orientated shell that supports a shaft, with protruding impeller arms for agitating the ... Read more
A study of the impact of technological innovations on the social sustainability of facilities management employees in South Africa

Author: Adama, Unekwu Jonathan Date: 2019 This research investigates the impact of technological innovations (TIs) on the social sustainability of facilities management (FM) employees in South Africa. The rationale for the study is that no empirical evidence shows how the adoption ... Read more
A study on commercial property pricing in Uganda

Author: Mirembe, Rachael Daisy Date: 2022 Property developers and investors seek to understand the drivers of prices for office and retail space. Through literature, we learn that size and age, locational attributes, physical features of the properties, and economic variables are ... Read more
A thermofluid network-based methodology for integrated simulation of heat transfer and combustion in a pulverized coal-fired furnace

Author: van Der Meer, Willem Arie Date: 2020 Coal-fired power plant boilers consist of several complex subsystems that all need to work together to ensure plant availability, efficiency and safety, while limiting emissions. Analysing this multi-objective problem requires a thermofluid ... Read more
A virtual element method for hyperelasticity

Author: van Huyssteen, Daniel Date: 2021 This thesis studies the approximation of plane problems of hyperelasticity, using a loworder virtual element method (VEM). The VEM is an extension of the finite element method (FEM). It is characterised by considerable freedom with regard to ... Read more
A web of relations: co-production arrangements in urban sanitation infrastructure provision in informal settlements in Arusha City, Tanzania

Author: Abwe, Furaha Date: 2019 Many city governments and actors have tested approaches or models and technological developments to address urban service crises. But this has tended to be without much success, as the service delivery gap keeps widening, leading to governance ... Read more
Abnormal combustion - methanol versus gasoline

Author: Yates, Andrew David Bennett Date: 1988 The maximum efficiency of conventional gasoline engines is largely determined by the compression ratio, and this is limited by the onset of kno8k. The maximum cylinder size is similarly constrained. The relatively higher knock resistance of ... Read more

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