Hlanganani Tutu

University of the Witwatersrand South Africa

Hlanganani Tutu is an associate professor in environmental chemistry at the University of the Witwatersrand, South Africa. He obtained his PhD degree in Environmental Chemistry from the same university in 2006. His research interests include geochemical modelling of solute transport, designing remediation strategies for contaminated environments, recovering value from waste and chemometric data modelling. He teaches courses in general chemistry, environmental chemistry and geochemical modelling and has supervised a number of research projects. He has published many articles in international scientific journals and chapters in books.

1books edited

3chapters authored

Latest work with IntechOpen by Hlanganani Tutu

As concerns increase over the scarcity of water resources and the role of anthropogenic activities, water quality is evermore important. Activities ranging from agriculture to mining have had a bearing on the quality of water that they impact. Several studies assessing such impacts have been conducted at local and global scales over the years. This book, consisting of contributions by authors in various water-related fields, delves into some approaches that are used to understand and/or to improve water quality, and these include assessment of water chemistry, biomonitoring, modelling and water treatment. This book will be useful to environmental scientists, water professionals, researchers, academics and students.

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Water Quality

Edited by Hlanganani Tutu

Chapters authored

Mining and Water Pollution

By Hlanganani Tutu

Part of the book: Water Quality

Geochemical Modelling of Water Quality and Solutes Transport from Mining Environments

By Bronwyn Camden-Smith, Raymond H. Johnson, Peter Camden- Smith and Hlanganani Tutu

Part of the book: Research and Practices in Water Quality

Prediction of Uranium Transport in an Aquifer at a Proposed Uranium In Situ Recovery Site: Geochemical Modeling as a Decision-Making Tool

By Raymond H. Johnson, Bronwyn P. C. Grover and Hlanganani Tutu

Roll fronts are some of the most important uranium deposits and are quite common in the United States. Generally, a roll front has an oxidized zone and a reduced zone, the latter being the zone of high mineralization and a target for in situ recovery (ISR) mining. The challenge remains the gathering of information to enable making informed decisions regarding post-mining groundwater quality. In this study, potential uncertainties in uranium sorption on iron oxyhydroxides or hydrous ferric oxides (HFO) following mining were assessed, as these oxidized zones create a greater risk for future uranium transport than fully reduced zones. Using two different geochemical databases, uncertainties in predicting uranium sorption on HFO based on a post-recovery restoration scenario were studied. The scenario was assessed using one-dimensional PHREEQC geochemical modeling simulations with respect to: uranium, oxygen, carbon dioxide, and iron hydroxide concentrations. The results of the simulations showed that uranium concentrations in solution are likely to be controlled by the amount of HFO available for sorption and the concentration of uranium-carbonate complexes formed in the solution. The presence of calcium, through the dissolution of calcite, was found to reduce the adsorption of uranium onto HFO as the resulting uranium-calcium-carbonate complexes are quite soluble. Overall, the simulations provide a procedure for predicting down-gradient uranium concentrations based on ultimate restoration levels at uranium ISR sites. This is important for risk assessment, regulatory enforcement, and decision making.

Part of the book: Management of Hazardous Wastes

Hlanganani Tutu

Latest work with IntechOpen by Hlanganani Tutu

Water Quality

Chapters authored

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