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Review
Environmental Sciences
Eric D. van Hullebusch et al.
Summary: This review paper explores the characterization of urban solid and liquid resource flows, emphasizing the potential for resource recovery through nature-based solutions and supporting units. The importance of collection and transport infrastructure, treatment and recovery technology, and (urban) agricultural or urban green reuse on input and output material quantity and quality are discussed.
Article
Environmental Sciences
Hasan Volkan Oral et al.
Summary: This study highlights the effectiveness of Nature-Based Solutions (NBS) in addressing urban circularity issues, particularly in restoring and maintaining the water cycle, and water and waste treatment, recovery, and reuse. Real-life case studies demonstrate the contribution of different NBS and supporting units towards urban circularity challenges, with a focus on combining different NBS to synergize enabling processes.
Article
Environmental Sciences
Alba Canet-Marti et al.
Summary: Urban agriculture plays a crucial role in the circular metabolism of cities by utilizing resources from waste streams to produce new food and biomass. However, there is still insufficient understanding of the input and output flows of different nature-based solutions to enhance circularity. Proposed agriculture NBS aim to address challenges and opportunities in urban spaces, highlighting gaps hindering the development of UA within the Circular City framework.
Article
Environmental Sciences
Chrysanthi-Elisabeth Nika et al.
Summary: The development and application of appropriate Circular Economy indicators is crucial for scientific, business, and decision-making communities. This study aims to bridge the gap between research, policy, and practice by developing a novel approach for indicator selection based on practitioners' views and needs, considering the complex interdependencies of the indicators. The study identifies key driving indicators for Circular Economy and enables their prioritization and implementation with other systems.
Article
Environmental Sciences
David Pearlmutter et al.
Summary: This study introduces a new paradigm to close water cycles in cities through the implementation of nature-based solutions units. By examining the life-cycle perspective and evapotranspiration performance of green roofs and vertical greening systems, it is found that these circular systems can provide significant ecosystem services in urban areas.
Article
Environmental Sciences
Daniel Todt et al.
Summary: Vacuum toilets have gained attention in circular urban development for their water saving and resource recovery potential. The development of a dual-flush vacuum toilet has shown significant reduction in water consumption and higher nutrient concentrations. However, user feedback indicates that there is still room for improvement in terms of user experience and water conservation.
Article
Environmental Sciences
Guenter Langergraber et al.
Summary: The translation above discusses the framework for addressing Urban Circularity Challenges using nature-based solutions, analyzing the perspectives of various urban sectors and discussing ways to overcome differences.
Review
Environmental Sciences
Eric Mino et al.
Summary: This study focuses on the lack of tools within European research projects that support the implementation of edible Nature-Based Solutions (NBS) for food production. The findings highlight a need for tools that can calculate food potential, assess urban design value, and share models and equations for open reuse.
Article
Environmental Sciences
Guenter Langergraber et al.
Summary: The new framework aims to facilitate the coupling of individual NBS units and NBS interventions with NBS that enable circular economy solutions by providing a comprehensive set of Urban Circularity Challenges (UCCs) and assessing over fifty NBS units and interventions in terms of their potential to address these challenges.
Article
Environmental Sciences
Goesta F. M. Baganz et al.
Summary: The study explores the application of aquaponics in an upscaled scenario in Berlin, requiring a large number of facilities to meet the demand of the residents, which can effectively save water resources. Additionally, causal link chains regarding production relocation and freshwater pescatarian diet are discussed.
Article
Environmental Sciences
Flora Prenner et al.
Summary: Vertical greenery systems (VGS) are promoted as a nature-based solution to mitigate the urban heat island effect. In order to ensure the long-term provision of this function, sufficiently available irrigation water is the key element. This study provides a conceptual model supporting rainwater harvesting as a sustainable resource for VGS irrigation.
Article
Environmental Sciences
Tamara Llano et al.
Summary: The European Union is planning to achieve climate neutrality by 2050, and in this context, the Icelandic government plans to ban new registrations of fossil fuel cars after 2030. Upgraded biogas can be used in vehicles with CNG engines to reduce CO2 emissions by 80%. A multi-criteria analysis was conducted to evaluate several alternatives of biogas plants, and the best alternative was found to be a single-stage biogas plant working with municipal solid waste.
Review
Environmental Sciences
Imane Hachoumi et al.
Summary: The study discusses the potential impact of green roofs and vertical greenery systems on urban runoff quality, emphasizing the importance of focusing on pollution sources and establishing appropriate decentralized stormwater treatment measures to reduce or avoid the emission of relevant pollutants into the aquatic environment.
