Dr. Pankaj Pathak is an Associate Professor in the Department of Environmental Science & Engineering at SRM University, AP, India. She obtained her Ph.D. degree in Environmental Geotechnology from the Indian Institute of Technology Bombay, India. Her area of domain includes solid and hazardous waste management, and waste to energy, and has a keen interest in sustainable green energy resources. She has published peer-reviewed articles in high-impact international journals and books with Springer, CRC etc. Dr. Rajiv Ranjan Srivastava is an academician and industrial researcher in the areas of hydrometallurgy, resource management, and reaction thermodynamics. He earned his Ph.D. in 2017 from the University of Science and Technology (South Korea) in the major of Resources Recycling, and currently he is a Senior Lecturer at the Faculty of Natural Sciences, Duy Tan University (Da Nang) and a Senior Researcher at the Center of Advanced Chemistry, Institute of Research and Development (Da Nang) in Vietnam. Besides this, he has remained associated with ATTERO Recycling (India), Tae-Hyung Recycling (South Korea), Rubamin Limited (India), and CSIR-National Metallurgical Laboratory (India) in various capacities. His interdisciplinary research interests include solid & industrial waste management, urban mining, and bio- and hydro-metallurgical exploitation of energy-critical elements for clean and alternative energy production. He has five patents, and published about 50 research articles in high-impact journals, some of them are among highly cited articles. Dr. Sadia Ilyas is a Brain Pool Scientist at the National Research Foundation of Korea (NRF) and a Professor (Research) in the Department of Earth Resources and Environmental Engineering at Hanyang University (Seoul), South Korea. She earned her Ph.D. in 2011 with doctoral research at theUniversity of Agriculture Faisalabad focused on the metals-to-microbe interactions in the geo-environment and their application in the sustainable exploitation of valuable metals from the burgeoning legacy of the digital world (i.e., electronic waste). Dr. Ilyas has 10+ years of post-Ph.D. experience in both teaching and research in the inter-disciplinary areas of bio- and hydro-metallurgy, applied, inorganic, and environmental chemistry, sustainable (solid & industrial) waste management, extraction of critical raw minerals, etc. During her career, she also had the opportunity to work in different countries with well- known institutions worldwide, like Hanyang University-Seoul, Jeonbuk National University-Jeonju and KIGAM-Daejeon in South Korea, the University of Agriculture Faisalabad and the GC University of Faisalabad in Pakistan, and the Wuhan Institute of Technology in China. She has six patents, published about 100 research articlesin high-impact journals, including many of them are highly cited, and wrote a number of book chapters and edited books.