Prof. Ajay Kumar Mishra is a Research Professor in the Nanotechnology and Water Sustainability Research Unit at the University of South Africa. He obtained a B.Sc. in chemistry and a Ph.D. in bio-inorganic chemistry. His primary research interests are in nanoscience and nanotechnology, materials science, polymers, composites / nanocomposites, and water research. He is the editor of several books and published over 160 articles in international scientific journals. Prof Mishra currently awarded as Fellow and chartered scientist at a royal society of chemistry, UK Dr. Hossain Md Anawar has a Bachelor of Science (Honours) in Chemistry, a Master of Science in Environmental Chemistry, and a Ph.D. in Environmental Biogeochemistry and Environmental Science. His current area of research is environmental chemistry, biogeochemistry and water quality. He is currently Visiting Associate with Macquarie University in Sydney, Australia. He is co-author of two books and contributed to four other books. He published 58 articles in international peer reviewed scientific journals. Dr. Nadjib Drouiche is the Head of Environmental Team, Centre de Recherche en Technologie des Semi-conducteurs pour l’Energétique in Algeria. He holds a Ph.D. degree in environmental engineering. His research interests encompass desalination, wastewater treatment by membranes, and recovery of byproducts resulting from treatment of PV wastewater and cutting oil used for manufacturing of wafers. He was awarded TWAS-ARO YAS Prize 2012 for Sustainable Management of Water Resources in the Arab Region. He published over 80 articles in international scientific journals.