The text comprehensively highlights the key issues surrounding the implementation of waste-to-energy systems, such as site selection, regulatory aspects and financial, and economic implications. It further discusses environmental aspects of food waste to energy conversion, microbial fuel cells (MFCs) for waste recycling and energy production, and valorization of algal blooms and their residues into renewable energy.This book: Discusses the environmental impact of waste-to-energy and sustainable waste-to-energy technologies in a comprehensive manner. Presents life cycle assessment studies and perspective solutions in waste-to-energy sectors. Covers applications of smart materials in thermal energy storage systems. Explains thermo-chemical technologies for recycling plastic waste for energy production and recovery of valuable products. Illustrates biorefineries and case studies for sustainable waste valorization. It is primarily written for senior undergraduate nad graduate students, and academic researchers in the fields of mechanical engineering, environmental engineering, energy studies, production engineering, industrial engineering, and manufacturing engineering.