**Acknowledgements**

The author would like to express his gratitude to King Khalid University (KKU), Saudi Arabia, for providing administrative and technical support. The author gratefully acknowledged the researchers, engineers, and technicians of the Laboratory of Natural Water Treatment (LabTEN) of the Centre of Researches and Technologies of Waters (CERTE), Technopark of Borj-Cedria (Tunisia), for many years of fruitful collaboration.
