Sustainability is more important than ever.
Principles of the circular economy, a model designed to prevent waste of materials through reuse and refurbishment, can help drive sustainability goals. And these principles have huge potential in wastewater management and treatment.
A new ASCE book, Circular Economy in Wastewater Management and Treatment, by Rao Surampalli, Ph.D., P.E., BCEE, NAC, NAE, F.EWRI, Dist.M.ASCE, Tian Zhang, Ph.D., P.E., BC.WRE, Dist.M.ASCE, Chih-Ming Kao, Ph.D., P.E., F.EWRI, Dist.M.ASCE, and others, discusses opportunities for integrating circular economy principles into wastewater management and treatment. It covers a variety of topics, including the fundamentals of the circular economy and its relationship with wastewater management, strategies for implementation, and applications in different industries.
Civil Engineering Source recently spoke with Surampalli, Zhang, and Kao about the inspiration behind the book, the process of its creation, and the implications it has for wastewater management and treatment.
Civil Engineering Source: What inspired you and your team to write Circular Economy in Wastewater Management and Treatment?
Rao Surampalli, Tian Zhang, and Chi-Ming Kao: The inspiration for this book can be traced back to our earlier work, Sustainable Solid Waste Management, which was published by ASCE in 2016. In that book, we discussed the concept of the 5Rs (or more) of waste management and emphasized the importance of moving away from the traditional "collect and dispose" paradigm toward strategies that reduce waste and recover value from materials. As we worked on that book, we began to think more broadly about how these same principles could be applied to other environmental systems. One question that continually emerged was: Why do we still view wastewater primarily as a waste stream rather than as a valuable resource? Wastewater contains water, energy, nutrients, and other recoverable resources that can contribute to sustainability goals if managed properly.
At the same time, the concept of the circular economy was gaining global attention as a framework for designing systems that minimize waste and maximize resource utilization. We realized that wastewater management was an ideal area for applying circular economy principles because modern treatment facilities are increasingly capable of recovering water, producing renewable energy, and reclaiming nutrients and materials, which motivated us to develop a book that would bring together circular economy concepts and wastewater engineering. Our goal was to provide a comprehensive resource that helps researchers, students, practitioners, and decision-makers understand how wastewater treatment can evolve from a traditional waste management function into a resource recovery and sustainability-driven enterprise. Ultimately, the book reflects our belief that the future of wastewater management lies not only in protecting public health and the environment, but also in creating value through the recovery and reuse of resources, thereby supporting more sustainable and resilient communities.
Source: What did the process of writing Circular Economy in Wastewater Management and Treatment look like?
Surampalli, Zhang, and Kao: The writing process was extensive and highly collaborative. One of the most important and time-consuming stages occurred before the actual writing began. Because circular economy is a broad and rapidly evolving concept, we spent considerable effort developing a comprehensive framework and detailed table of contents that would serve as the foundation for the entire book.
Our objective was to create a resource that systematically connects circular economy principles with wastewater management and treatment theory, technologies, and applications. To achieve this, we identified key topics and organized them into three major parts.
Part I establishes the conceptual foundation. It introduces circular economy principles, discusses their relevance to wastewater systems, and examines how sustainability and resource recovery can be integrated into wastewater management and treatment practices.
Part II focuses on municipal and domestic wastewater systems. This section explores practical strategies and technologies related to water reuse, nutrient recovery, energy generation, resource recovery, and sustainable treatment approaches.
Part III expands the discussion to industrial sectors, highlighting how circular economy concepts can be tailored to the unique characteristics and challenges of various industrial wastewater streams.
Once we developed and refined this structure, we began identifying leading subject matter experts who could contribute to each chapter. This collaborative approach allowed us to bring together perspectives from researchers, educators, and practitioners with diverse backgrounds and experiences.
Throughout the process, our goal was to maintain both academic rigor and practical relevance. We worked closely with chapter authors to ensure consistency while allowing each contributor to provide the latest knowledge, innovative technologies, and real-world applications in their area of expertise. The process involved extensive literature review, discussion among co-authors, and careful synthesis of rapidly evolving knowledge in the field. It was both challenging and rewarding because it allowed us to bring together diverse perspectives into a unified framework for sustainable wastewater management.
The result is a book that not only explains the principles of circular economy in wastewater management and treatment but also demonstrates how those principles can be implemented in both municipal and industrial settings. The structure makes the book useful for a wide audience, including students, researchers, practicing engineers, utility managers, and policymakers.
Source: How do you expect the book to advance wastewater management and treatment practices?
Surampalli, Zhang, and Kao: The book aims to accelerate the transition from conventional wastewater treatment facilities to resource recovery and water resource recovery facilities.
Historically, the primary objective of wastewater treatment has been pollution control and regulatory compliance. While these goals remain essential, today's challenges, including water scarcity, energy costs, nutrient management, and climate change, require a broader perspective. Circular economy principles encourage utilities to recover value from wastewater in the form of reclaimed water, renewable energy, nutrients, and other resources.
The book provides both the conceptual foundation and the practical tools needed to support this transition. It offers engineers, planners, and decision-makers a framework for evaluating treatment strategies based not only on treatment performance but on resource efficiency, environmental sustainability, and long-term economic benefits. Ultimately, we hope the book will encourage innovation, support evidence-based decision-making, and inspire new approaches that enhance both environmental and societal outcomes.
Source: In what aspects of wastewater management and treatment do you think this book will make the largest impact?
Surampalli, Zhang, and Kao: We believe the book can make its greatest impact in four key areas.
The first is water reuse and water sustainability. As many regions face increasing water stress, there is growing interest in treating wastewater as a reliable alternative water source. The book highlights strategies and technologies that support safe and sustainable water reuse.
Second, resource recovery and energy production. Modern treatment facilities have tremendous potential to recover energy, nutrients, and valuable materials. By presenting emerging technologies and successful applications, the book helps demonstrate how wastewater utilities can become producers of resources rather than consumers of them.
Third, infrastructure planning and utility management. The circular economy requires a shift in how infrastructure investments are evaluated. We hope the book helps utilities incorporate life-cycle thinking, resilience, and sustainability metrics into planning and decision-making processes.
The fourth, and perhaps most lasting impact, is helping to prepare future engineers and environmental professionals. As sustainability becomes increasingly central to infrastructure development, there is a growing need for educational resources that integrate engineering fundamentals with circular economy principles. The book is designed to serve as a valuable resource for both classroom and professional practice.
Overall, our vision is that the book will advance a paradigm shift in wastewater management, from waste treatment to resource stewardship, and support the development of more sustainable, resilient, and circular water systems for future generations.
Learn more and read Circular Economy in Wastewater Management and Treatment at ASCE Library.
