Dr. Pardeep Singh is presently working as an Assistant professor (Department of Environmental Science, PGDAV College, University of Delhi, New Delhi, India). He obtained his master's degree from the Department of Environmental Science Banaras Hindu University, Varanasi India in 2011. He obtained his doctorate from the Indian Institute of Technology (Banaras Hindu University) Varanasi in the year 2017. The area of his doctoral research is the degradation of organic pollutants through various indigenous isolated microbes and by using various types of photocatalytic. He has published more than 65 papers in the international journals in the fields of waste management. Dr Vijay Kumar is presently working as Executive Member, Society for Environment and Sustainable Development, New Delhi India. He obtained his master degree from the Department of Environmental Science Banaras Hindu University, Varanasi India in 2012. He received his doctorate from Indian Institute of Technology (Banaras Hindu University) Varanasi in 2017. His doctoral research area is biological synthesis of silver and gold nanoparticles and their environmental and biological applications. He has published more than 27 papers in the International Journals in the field of environmental nanotechnology. Mansi Bakshi works in the Department of Civil Engineering at the Indian Institute of Technology, New Delhi, India. Mika Sillanpää is a Distinguished Professor in the Faculty of Engineering and the Built Environment, Department of Chemical Engineering Technology, University of Johannesburg, South Africa. His research work centers on chemical treatment in environmental engineering and environmental monitoring and analysis. More specifically, he has worked extensively with adsorption, photocatalysis, electrochemical treatment, membrane biological processes and advanced oxidation processes as well as ion mobility spectrometry, chromatographic methods, electrochemical sensor development and real-time monitoring. Prof. Chaudhery Mustansar Hussain is an Adjunct Professor and Director of laboratories in the Department of Chemistry & Environmental Sciences at the New Jersey Institute of Technology (NJIT), Newark, New Jersey, United States. His research is focused on the applications of nanotechnology and advanced materials, environmental management, analytical chemistry, and other various industries. Dr. Hussain is the author of numerous papers in peer-reviewed journals as well as a prolific author and editor of around 150 books, including scientific monographs and handbooks in his research areas.