Summary
Urban water scarcity and growing agricultural water demands underscore the urgent need for advanced, sustainable strategies in water and nutrient management. This study examines the potential of green wall treatment systems for on-site water and nutrient reuse to create local circular food systems. Two case studies are evaluated: Cambium eco-village (rural area of Styria, Austria) and Zukunftshof urban farm (city of Vienna, Austria), with scenarios involving green wall treatment systems as well as rainwater and compost use. A material flow analysis approach is used to investigate the efficiency of these scenarios in meeting agricultural water and nutrient demands. The findings show that these wastewater treatment and reuse systems can be integrated in different community projects, demonstr
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