Department of Process Engineering
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Pyrolysis of contaminated PS single-layer and LDPE/PET multi-layer waste plastic packaging to optimise the production of oil for fuel applications
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: It has been predicted that by 2050 there will be more plastic in the ocean than fish by weight. Besides the obvious environmental threat, plastic waste also poses a loss of valuable hydrocarbon-based ... -
Design and modeling of an experimental tilapia and African catfish recirculating aquaculture system
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: This study aimed to design a new warm-water recirculating aquaculture system (RAS) that will have the flexibility to rear both African catfish (Clarias gariepinus) and Mozambique tilapia (Oreochromis ... -
Investigation of the effect of compositional variations on the flotability of pyrite in a gold ore
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Gold is associated with pyrite, arsenopyrite and arsenian pyrite in refractory gold ores. Due to the presence of arsenic or other compositional variations in the pyrite, the semiconductor ... -
High-pressure phase behaviour of saturated and unsaturated fatty acid esters in supercritical CO2
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: A variety of high-value compounds can be found in the oils extracted from fish, plants, and algae. Chief among these are fatty acids. These compounds are frequently processed in the form of fatty acid ... -
The extraction of resveratrol and other polyphenols from solid winery waste and an investigation into alternative resveratrol recovery techniques
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Resveratrol is a phenolic compound that is produced by several plant species such as grape (Vitis vinifera) as a protection mechanism against both biotic and abiotic stress. Resveratrol is currently of ... -
In situ extraction of volatile fatty acids from anaerobic digestion systems
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: In recent decades anaerobic digestion (AD) technology has gained significant interest due to policymakers’ intent to reduce non-renewable resources, and for the processing of organic wastes. AD ... -
Use of South African spent pulping liquor to synthesise lignin phenol formaldehyde resins
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: The probable scarcity of petroleum-based products, the resultant price fluctuations, and environmental concerns have driven the need for a total or partial phenol replacement in phenol-based products. ... -
The hydrodynamics of supercritical packed countercurrent columns
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Supercritical fluids are enjoying ever-increasing popularity as a solvent medium for extraction, stripping, absorption and fractionation processes. Although the potential of supercritical fluids as solvents ... -
Exergy, techno-economic and exergoeconomic analyses for improving energy efficiency of a typical sugar mill and designing integrated biorefineries
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: The sugar industry is energy-intensive, consuming about 350–600 kg of steam and 25–32 kWh electricity per ton of sugarcane processed into raw crystalline sugar. Though mostly energy-self-sufficient, ... -
The valorisation of paper sludge for green composite material
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: The South African pulp and paper industry generates about 500 000 wet tons of paper sludge (PS) per annum with the traditional means of waste disposal being landfilling. Increased efforts have been put ... -
Investigating the influence of electrolyte composition on electrodeposition in copper electrowinning
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: The major concern in copper electrowinning is to deposit smooth, dense, pure copper at high current efficiency and low energy consumption. Electrolyte physicochemical propertiesnamely ... -
Process improvements and techno-economic analyses for the production of short-chain fructose-containing oligosaccharides from sucrose and Jerusalem artichoke tubers
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Recent years have seen significant growth in the global market for short-chain fructooligo saccharides (scFOS) and inulooligo saccharides (IOS) due to the rising health ... -
The effect of environmental conditions on growth and phenotype switching in Mycobacterium smegmatis
(Stellenbosch : Stellenbosch University, 2020-03)ENGLISH ABSTRACT: Mycobacterium tuberculosis can exist within a host in a seemingly dormant state, in which it can tolerate antibiotic challenge. This non-heritable survival mechanism is thought to be the cause of latent ... -
Enzymatic extraction of laminarin from brown seaweed Ecklonia maxima
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Response surface methodology was used to investigate the enzymatic extraction of β-glucan laminarin from Ecklonia maxima, a South African kelp. A commercial cellulase (Celluclast® 1.5L, “Celluclast”) was ... -
Automating the initialisation of relay autotuning using control performance monitoring
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Relay autotuning is an automated procedure that obtains accurate tuning parameters for the process controller when required. An automated controller tuning procedure would be desirable within industry due ... -
Bayesian parameter estimation for process monitoring
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: The underlying mechanism of many physical systems studied in engineering can be described by algebraic, ordinary differential and auxiliary equations. While these equations stem from engineering expertise, ... -
An investigation into treatment options to improve the performance of re-used seed crystals for gypsum precipitation in the presence of an anti-scalant
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Many mines in South Africa generate large volumes of acid mine drainage (AMD), containing relatively high concentrations of sulphates. Several mine water treatment plants utilise intermediate seeded slurry ... -
Techno-economic evaluation of organic solvent nanofiltration : recovering dewaxing solvent from lube-oil
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: To recover the solvent from dewaxed lube-oil, classical separations such as evaporation and distillation are typically used. In the past decade separations that consume less energy and utilities have been ... -
Feasibility of fluxless smelting of titaniferous magnetite ore in a pilot-plant open-arc DC furnace
(Stellenbosch : Stellenbosch University., 2020-03)ENGLISH ABSTRACT: Titaniferous magnetite (titanomagnetite) is nominally defined as magnetite deposits containing more than one mass percent of titanium dioxide (TiO2). Titanomagnetite deposits are known for being difficult ... -
Designing and evaluating the technical, economic and environmental performance of an adsorption cooling system operating using bioresources from waste streams of mango processing
(Stellenbosch : Stellenbosch University, 2019-12)ENGLISH ABSTRACT: This study sought to improve the technical performance (coefficient of performance (COP) and specific cooling power (SCP)), environmental impacts and economic viability of employing the adsorption working ...
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