1. Department of Environmental and Occupational Studies, Faculty of Applied Sciences, Cape Peninsula University of Technology, Zonnebloem, Cape Town 7925, South Africa
2. Department of Water and Sanitation, 35 Brown Street, Mbombela 1201, South Africa
3. Department of Biodiversity, School of Molecular and Life Sciences, Private Bag X1106, Sovenga 0727, South Africa
4. Centre for Postgraduate Studies (CPGS), Faculty of Applied Sciences, Cape Peninsula University of Technology, Bellville South Industrial, Cape Town 7530, South Africa