Dr Pardeep Singh is presently working as Assistant professor Department of Environmental Studies , PGDAV College, University of Delhi New Delhi India. He obtained his master degree from the Department of Environmental Science Banaras Hindu University, Varanasi India. He received his doctorate from Indian Institute of Technology (Banaras Hindu University) IIT(BHU) Varanasi. He is working in the areas of waste management and wastewater treatment through the biological as well as photocatalytic route.He has published more than 65 papers in the international journals in waste management and edited more than 30 Books with Elsevier, Wiley, CRC and Springer. Chaudhery Mustansar Hussain, PhD is an Adjunct Professor and Director of Labs in the Department of Chemistry & Environmental Sciences at the New Jersey Institute of Technology (NJIT), Newark, New Jersey, USA. His research is focused on the applications of Nanotechnology & Advanced technologies & Materials, Analytical Chemistry, Environmental Management, and Various Industries. Dr. Hussain is the author of numerous papers in peer-reviewed journals as well as prolific author and editor of several (more than 50 books) scientific monographs and handbooks in his research areas published with Elsevier, Royal Society of Chemistry, John Wiley & sons, CRC, Springer etc. Mika Sillanpää received his MSc (Eng.) and DSc (Eng.) from Helsinki University of Technology, Finland (now known as Aalto University), where he also completed an MBA in 2013. He completed his master’s studies at the Department of Chemical Engineering at Helsinki University of Technology Since 2000, he has been a full Professor at the University of Oulu, University of Kuopio (currently University of Eastern Finland), LUT University and Aarhus University. He has peer-reviewed articles for over 250 academic journals, many of which are ranked top in their fields as well as serving on a number of editorial boards for several publications. Having an h-index of 92, his publications have been cited over 43,000 times (Google Scholar). Mika Sillanpää has received numerous awards for research and innovation. Among these, he is the first Laureate of Scientific Committee on the Problems of the Environment (SCOPE)’s Young Investigator Award, which was delivered at the UNESCO Conference in Shanghai 2010, for his "significant contributions, outstanding achievements and research leadership in Environmental Technological Innovations to address present water pollution problems worldwide, especially with regard to wastewater treatment and reuse". In 2011, he was invited to act as a Principal Scientific Reviewer in the GEO-5 report of the United Nations Environmental Programme (UNEP).