Prof. Vladimir Strezov is a Professor in the Department of Environmental Sciences, Faculty of Science and Engineering, Macquarie University, Australia. He holds a PhD in Chemical Engineering and a Bachelor of Engineering in Mechanical Engineering. Professor Strezov leads a research group at Macquarie University working on renewable and sustainable energy, industrial ecology, and control of environmental pollution. He serves as an advisory panel member for the Australian Renewable Energy Agency (ARENA) and is a Fellow of the Institution of Engineers Australia. Professor Strezov is author of more than 200 articles and editor of four books. Dr. Hossain M. Anawar has been recognized for his significant research work on environmental chemistry and biogeochemistry. His research excellence is recognized in 59 peer-reviewed international SCI journals, 18 book chapters, many conference publications and books of the world eminent individuals such as Marquis Who’s Who in Science and Engineering, 2003. He has been regularly invited to referee manuscripts from 15 international leading journals. Dr. Abhilash is Senior Scientist and Assistant Professor (AcSIR) of Secondaries and Resource Utilisation Group, Metal Extraction & Recycling Division at CSIR-National Metallurgical Laboratory, Jamshedpur, India. He has published 47 publications in national and international journals, 10 book chapters, 5 edited books, and nearly 30 conference publications. He is on the Editorial Board- Mineral processing and Extractive Metallurgy Review (Taylor & Francis), Russian Journal of Nonferrous Metals (Springer). He has been recognised for his contributions to Biohydrometallurgy, Waste Recycling (urban and process), and Rare Earth Extraction.