This study evaluates decentralised water and nutrient management strategies in two Austrian case studies: a rural eco-village and an urban farm. Green wall treatment systems, rainwater harvesting, and compost application were assessed for their potential to meet local irrigation and fertilisation needs. Results show that reclaimed wastewater can fulfill nearly all water demands and substantially cover nitrogen and phosphorus needs, though over-fertilisation risks must be managed. Rainwater harvesting complements reclaimed water use, particularly in larger areas. Integrating anaerobic digestion enhances nutrient recovery and energy production, positioning green walls as viable components of circular, resilient food systems.
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