Masters Degrees (Process Engineering)
Recent Submissions
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Base metal recovery from glycine leach solutions using ion exchange or solvent extraction
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Technological advances lead to a reduced life span of electronic equipment. This leads to large quantities of electronic waste being produced. The recovery of metals from electronic waste has both an ... -
Mechanisms and kinetics of atmospheric sphalerite oxidative and non-oxidative leaching
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: A kinetic study of the non-oxidative and oxidative leaching of sphalerite concentrates, under elevated temperatures (75 – 95 °C) and atmospheric pressure is presented in this dissertation. Sphalerite, a ... -
Phase equilibrium of limonene, p-cymene, indane, butylbenzene and 1,2,3-trimethylbenzene at subatmospheric conditions
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Waste tyre pyrolysis has long been seen as a suitable solution to the growing issue of accumulation of waste tyres in our environment. The pyrolysis of waste tyres produces three useful products, namely ... -
Techno-economic analysis of Xylitol, Citric Acid and Glutamic Acid biorefinery scenarios utilizing sugarcane lignocellulose
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: A decrease in global sugar prices, lower crop yields (caused by drought) and the continued use of aging and inefficient infrastructure have been listed as external factors contributing to decreasing ... -
Determination of drainage rates of heavy media for different aperture sizes on a vibrating screen
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Media losses are a significant contributor to the operational cost in a dense media separation (DMS) circuit. Of these losses, up to 80 wt% can occur on the drain and rinse vibrating screens. Although these ... -
Development and feasibility of an electrochemical-oxidation process for water disinfection
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Quality of water supplies for potable use has deteriorated to such a state that point-of-use water disinfection has become a necessity. Historically, chlorine has been the most widely used disinfectant, ... -
Pellet-size estimation of a ferrochrome pelletizer circuit using Computer Vision techniques
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Agglomerate pellet size plays an integral part in the safe and stable operation of a submerged arc furnace (SAF), and the efficiencies and yields achieved within the ferrochrome refining processes. For ... -
Design, construction and evaluation of a vacuum evaporation system for the concentration of aqueous whey protein solutions
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Vacuum evaporation is an old and established technology for the industrial concentration of high water content streams. It is a clean, safe and versatile technology with low management costs. The aim of ... -
Extraction and modification of hemicellulose from wheat bran to produce entrapment materials for the controlled release of chemicals and bioactive substances
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Hydrogels are a network of cross-linked hydrophilic polymers that form an insoluble three-dimension structure capable of imbibing large amounts of fluid and they can be used as entrapment matrices for ... -
The microbial devulcanisation of waste ground tyre rubber using acidophilic microorganisms
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: The structural stability provided by vulcanisation presents a major hurdle in the reclamation of tyre rubber. Devulcanisation processes aim to break the sulphur crosslinks in the tyre matrix, while preserving ... -
Lactic acid production from sugarcane bagasse and harvesting residues
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Sugarcane bagasse and harvesting residues collected from different sugars mills across South Africa were evaluated for potential use in a biorefinery for ethanol, lactic acid and electricity co-production ... -
Pyrolysis of waste plastics into chemicals as an alternative to landfilling or incineration
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: World population growth has brought about high production and consumption trends on the petroleum resources. One aspect contributing to this trend is plastic manufacture accounting for considerable petroleum ... -
Evaluating the applicability of an alkaline amino acid leaching process for base and precious metal leaching from printed circuit board waste
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: The recovery of metals from waste printed circuit boards (PCBs), a key component in electronic equipment, is beneficial from both an environmental and economic perspective. Current hydrometallurgical ... -
Application of membrane technology for purifying tyre derived oil
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Tyre derived oil (TDO) is an abundant liquid product obtained after pyrolysis of waste tyre. It contains a complex mixture of C6–C24 organic compounds of various classes such as paraffins, olefins, aromatics, ... -
Purification of Bacillus amyloliquefaciens lipopeptides for postharvest disease control
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Africa is the largest exporter of fresh fruit (by volume) in the southern hemisphere and as such, the quality of fruit must be maintained throughout the global supply chain. Several fungal pathogens ... -
Dehydration of hydrazine hydrate by pervaporation using commercially available polymer membranes
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Hydrazine (N2H4) is a valuable, Commercial, inorganic compound that is characterised as a small, reactive molecule with good reducing properties. In its anhydrous form, hydrazine is used in the medical ... -
Constitutive expression of enzymes in Pichia pastoris for use in lignin valorisation
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Lignin valorisation is a key breakthrough in developing efficient integrated biorefineries. Enzymatic modification of lignin wastes offers an environmentally benign, energy efficient avenue for lignin ... -
Biological control of postharvest disease in the perishable fruit industry by bacillus lipopeptides
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: The work presented in this study aimed to investigate the suitability of Bacillus spp. lipopeptides to be used as effective biocontrol agents that have the potential to replace chemically synthesised ... -
Behaviour of oxygen transfer in a simulated multiphase hydrocarbon-based bioprocess in a bubble column reactor
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Linear alkane hydrocarbons can be converted into higher value products and product-precursors through the addition of an oxygen moiety. One method of upgrading these hydrocarbons is through biologically-mediated ... -
Opportunities for solar process heat integration and heat recovery in the South African fishmeal industry
(Stellenbosch : Stellenbosch University, 2018-03)ENGLISH SUMMARY: Solar thermal renewable energy is a promising alternative heat source capable of providing a large portion of the South African industrial heat demand. The major energy demand within the energy intensive ...
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