This book presents a comprehensive overview of current advancements in wastewater treatment technologies, with a particular emphasis on sustainable and innovative approaches. It compiles detailed information on various treatment methods, including physical, chemical, and membrane-based processes, to improve water quality, enable resource recovery, and enhance environmental protection. Special attention is given to emerging technologies, including membrane filtration, photocatalysis, nanobubbles, and non-thermal plasma systems, for the removal and degradation of emerging pollutants in wastewater. The book also explores the development and broader application of these technologies in both domestic and industrial wastewater treatment sectors. This book will be a valuable resource for environmental and chemical engineers, technicians, and academic researchers seeking in-depth knowledge of modern wastewater treatment strategies and the integration of advanced technologies into sustainable infrastructure.