This book explores a diverse spectrum of waste materials, encompassing industrial hazardous and non-hazardous waste, agricultural waste, biomass waste, radioactive waste, municipal solid and liquid waste, as well as e-waste, and investigates their adverse impacts on the environment. It is an exciting exploration of various approaches to waste management, highlighting the importance of adopting sustainable practices such as the 7Rs principle, utilization of nanomaterials and photocatalysis, ...