1. Department of Chemical Engineering; KU Leuven; Celestijnenlaan 200F, Leuven B-3001 Belgium
2. Department of Environmental and Chemical Engineering; University of Calabria; Via Pietro Bucci, Cubo 44A, Arcavacata di Rende, CS 87036 Italy
3. Department of Chemical Engineering; KIoT, Wollo University; Kombolcha, Ethiopia
4. Faculty of Engineering and the Built Environment; Tshwane University of Technology; Private Bag X680, Pretoria 0001 South Africa