Co-designing Organic Residue Recycling Chains in Réunion

The study describes a collaborative project in western Réunion aimed at closing biogeochemical loops by recycling organic residues from agriculture, urban areas, and agro-industry. Stakeholders joined participatory design workshops to develop prospective scenarios: a minimal scenario producing a bulk co-compost from livestock manure and green waste, and an optimal scenario extending this to industrial‐scale production of concentrated organic and organo-mineral fertilizers. Although topographical and equipment constraints restrict local agro-ecological gains, the optimal scenario could ultimately substitute over half of imported fertilizers in the region, enhancing nutrient self-sufficiency.