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Browsing by Author "Lewis, Alison"

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An investigation into the precipitation of Fe(III) oxyhydroxides in lime neutralization processes

Author: Mangunda, Cledwyn Tawanda Date: 2019 Acid Mine Drainage (AMD) and hydrometallurgical wastewater are products of extractive activities that pose environmental risks as they contain heavy metals. The contents of these streams, which is dominated by iron, necessitates an effective ... Read more
Crystal growth and nucleation kinetics of diethylenetriammonium hexachlororhodate (III) salt

Author: Engelbrecht,Edmund Date: 2019 At Anglo American Platinum's Precious Metal Refinery, rhodium separates from a base metal-rich solution by precipitation. Hexachlororhodate (III) ions and cationic protonated diethylenetriamine ions exchange to form diethylenetriammonium ... Read more
Developing methods to access sensitive industrial wastewater information in South Africa (with treatment in mind)

Author: Harding, Genevieve E Date: 2018 South Africa is a water stressed country, therefore it is important to understand water use and wastewater generation. Previous research and workshops have identified gaps in the characterisation and remediation of wastewaters in South Africa. ... Read more
Gypsum seeding to prevent scale formation and improve separation efficiency

Author: Chagwedera, Taona Malvin Date: 2021 Eutectic freeze crystallization (EFC) is a novel separation technique that can be applied to treat brine solutions such as reverse osmosis retentates. These are often a mixture of different inorganic solutes. The treatment of calcium sulphate-rich ... Read more
Improving the settleability of a metal sulphide suspension by the application of a magnetic field

Author: Gqebe, Sibongiseni Yamkela Date: 2015 Gravitational sedimentation of suspensions in various precipitation processes is hindered by colloidal stability. More especially in sulphide precipitation, where high levels of supersaturation dominate and nucleation is favoured. This results ... Read more
Investigating the Effect of Surface Properties on Ice Scaling in Eutectic Freeze Crystallization

Author: Motsepe, Lerato Date: 2021 Eutectic Freeze Crystallization (EFC) is an innovative technology that can be applied to treat reverse osmosis (RO) waste streams (brines), to produce pure salt and water. Scaling of the heat exchanger (HX) surface by both ice and salt is ... Read more
The TCLP and its applicability for the characterization of worst case leaching of wastes from Mining and Metallurgical operations

Author: Cohen, Brett ; Lewis, Alison ; Petersen, Jochen ; von Blottnitz, Harro ; Drews, S C ; Mahote, S I Date: 1999 Laboratory batch extraction tests, such as the Toxicity Characteristic Leaching Procedure (TCLP), are widely used to classify industrial solid wastes destined for disposal in landfills. Whilst the ease and speed of such tests makes their use ... Read more
The hydrated lime dissolution kinetics in acid mine drainage neutralization

Author: Mgabhi, Senzo Mntukhona Date: 2021 Hydrated lime, Ca(OH)₂, has been rediscovered as an environmentally sustainable product, which could be of help in the remediation of acid mine drainage (AMD), especially in the AMD neutralization process. This is due to its ease of acquisition, ... Read more
Treatment of a multicomponent mining effluent using calcium hydroxide in a fluidized bed crystallizer

Author: Maharaj, Chiara Date: 2016 Wastewater which primarily emanates from mining operations and manufacturing industries, has the potential for re-use if treated effectively. These wastewaters, which are typically characterized by high concentrations of dissolved inorganic ... Read more

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Browsing by Author "Lewis, Alison"

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