1. Department of Chemical, Metallurgical and Materials EngineeringTshwane University of TechnologyPretoria 0001South Africa
2. SARChI Chair for Mine Water ManagementDepartment of Environmental, Water, and Earth SciencesTshwane University of TechnologyPretoria 0001South Africa
3. Lappeenranta University of Technology, Laboratory of Green ChemistrySammonkatu 1250130MikkeliFinland