1. Circular economy approach in the water and wastewater sector Marzena Smol 2. Integrating circularity to achieve sustainability: Examples of various wastewater treatment systems Tamara Avellán, Nidhi Nagabhatla, Ishita Jalan, and Danielle Liao 3. Risks associated with the circular economy: Treated sewage reuse in agriculture Ana María Leiva, Benjamín Piña, and Gladys Vidal 4. Wastewater reuse for agricultural irrigation in Greece: Review of guidelines under the prism of the latest European Union's policy developments Charikleia Prochaska and Anastasios Zouboulis 5. A circular model for sustainable produced water management in the oil and gas industry Alexandros I. Stefanakis 6. College of engineering Pune hostel campus: An Indian experience of sustainable wastewater treatment and reuse F. Masi, R. Bresciani, A. Rizzo, and D. Panse 7. Wastewater treatment and sludge management strategies for environmental sustainability Manisha Sharma, Ankush Yadav, Mrinal Kanti Mandal, Shailesh Pandey, Supriya Pal, Hirok Chaudhuri, Sandip Chakrabarti, and Kashyap Kumar Dubey 8. Recovery of nutritional resources of urban sewage sludge in lettuce production T.N. Moraes, D.O. Guilherme, P.S. Cavalheri, and F.J.C. Magalhães Filho 9. Sludge drying reed beds: A key ecotechnology for a sustainable sanitation infrastructure in Brazil Andre Baxter Barreto, Gabriel Rodrigues Vasconcellos, and Breno Henrique Leite Cota 10. Manure treatment and recycling technologies Renjie Dong, Wei Qiao, Jianbin Guo, and Hui Sun 11. Circular economy in the Mesopotamian Marshes: The Eden in Iraq Wastewater Garden Project Davide Tocchetto, Meridel Rubenstein, Mark Nelson, and Jassim Al-Asadi 12. Design concept and performance of a constructed wetland system engineered for the circular economy Akintunde O. Babatunde 13. Valorization of solid waste in subsurface flow constructed wetlands based on renewable modular structures: A contribution to a circular economy Henrique J.O. Pinho and Dina M.R. Mateus 14. Nature-based solutions for socially and environmentally responsible new cities: The contribution of green roofs Cristina Sousa Coutinho Calheiros, Beatriz Castiglione, and Paulo Palha 15. Constructed wetlands' application for flower farms wastewater treatment in developing countries: Case study in Kenya Gilbert Atuga and Tsuma Jembe 16. Ecotoxicity evaluation of diclofenac potassium in vertical flow constructed wetlands as posttreatment of septic tank effluent P.S. Cavalheri, M.A. Mello, A.L. Pereira, T.R. Marques, T.N. Moraes, G.H. Cavazzana, and F.J.C. Magalhães Filho 17. Searching for sustainability in organic matter and nitrogen removal by integrating constructed wetlands and microbial fuel cells Daniela López, Thaís González, Gloria Gómez, Juan Pablo Miranda, Jose Contreras, and Gladys Vidal 18. Creative approaches in engaging the community toward ecological waste management and wetland conservation Aaron Julius M. Lecciones, Kevin Roy B. Serrona, Ma. Catriona E. Devanadera, Amy M. Lecciones, and Jeongsoo Yu 19. Circular economy in the building sector: Towards a holistic framework for implementing circular business models Fatima Khitous, Andrea Urbinati, Davide Chiaroni, and Raffaella Manzini 20. Improving circular building under uncertainty and complexity: Exploring recent trends in the Netherlands Jannie Coenen 21. Circular materials-An essay on challenges with current manufacturing and recycling strategies as well as on the potential of life cycle integrated designs Ludovic F. Dumee 22. Waste to energy at the neighborhood microscale in the urban regeneration of Madrid peripheries: Towards effective circular neighborhoods Francisco Javier González, Susana Moreno, and Lourdes Rodriguez 23. Optimization of surface mining operation based on a circular economy model F. Pavloudakis, C. Roumpos, and P.M. Spanidis 24. Sustainability assessment of bioleaching for mineral resource recovery from MSWI ashes Valerio Funari 25. Circular economy for the sustainability of the wood-based industry: The case of Caraga Region, Philippines Raquel M. Balanay, Rowena P. Varela, and Anthony B. Halog 26. Equilibrium modeling and statistical analysis of struvite precipitation for nutrient recovery from corn-ethanol downstream process Ravi Kanani 27. Food processing wastes as a potential source of adsorbent for toxicant removal from water Son Van Tran, Khai Manh Nguyen, Ha Thi Nguyen, Alexandros I. Stefanakis, and Phuong Minh Nguyen 28. Sustainable circular economy design in 2050 for water and food security using renewable energy Seeme Mallick 29. Towards circular economy in e-waste management in India: Issues, challenges, and solutions Biswajit Debnath, Ankita Das, and Abhijit Das