The book, "Exploring Circular Economy in Wastewater Treatment" will present a comprehensive exploration of circular economy principles in the context of wastewater treatment. This groundbreaking work will delve into the fundamentals of circular design, emphasizing holistic systems thinking, nature-based solutions, and decentralized treatment systems. By addressing resource recovery and reuse strategies, the proposed book will illuminate methods for transforming wastewater into valuable resources, including nutrients and energy. Cutting-edge technologies, such as smart automation and advanced oxidation processes, will be scrutinized for their potential in optimizing circular systems. Real-world case studies offer practical insights, revealing successful implementations and lessons learned. Regulatory considerations will be underscored, demonstrating the integral role of public involvement and policy frameworks in fostering circular practices. The textbook will not only serve as an educational tool for professionals and researchers but also as a catalyst for interdisciplinary collaboration, inspiring innovative solutions for sustainable water futures. By amalgamating knowledge, case studies, and emerging trends, this text is poised to leave a lasting impact on the research community, influencing future studies, policy decisions, and advancements in circular wastewater treatment worldwide.