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                <term xml:lang="en">tri mécano-biologique biowaste</term>
                <term xml:lang="en">circular bioeconomy</term>
                <term xml:lang="en">composting</term>
                <term xml:lang="en">governance</term>
                <term xml:lang="en">interterritoriality</term>
                <term xml:lang="en">organic waste</term>
                <term xml:lang="en">mechanical biological treatment</term>
                <term xml:lang="en">sociometabolic node</term>
                <term xml:lang="en">suburban area</term>
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                <term xml:lang="fr">compostage</term>
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                <term xml:lang="fr">interterritorialité</term>
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              <p>For around fifteen years, organic materials that their owners discard, have been the subject of greening policies and strategies. This article, devoted to the case of Nantes suburban area, analyzes these issues using the concept of sociometabolic node, an intersection point between diverse sociotechnical elements. The analysis is based on the latest activity reports from local public authorities and a survey conducted in 2024. On the basis of the typology we developed, we analyze the specific issues of each type of treatment. The delegitimization of mechanical-biological sorting and the deposit of green waste in recycling centers raise questions about the future of negative commons. The promotion of composting at the finest scales renews practices governance issues. The constraints weighing on the prospects for anaerobic digestion call into question the relevance of energy recovery. The strategy of sociotechnical relocation of treatment does not eliminate interterritoriality issues. For the time being, the goal of a detachment from the infrastructures inherited from the massification of household waste management does not result in a biowaste metabolism transformation. In addition, this strategy is part of issues of multi-scale governance and interaction between different activities: the different sectors of the waste sector and the agriculture and energy sectors.</p>
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              <p>Une lecture par les noeuds socio-métaboliques comme révélateurs des enjeux de la circulation des matières organiques. Le cas du périurbain nantais An analysis based on sociometabolic nodes as organics materials circulation issues clues. Nantes suburban area case Résumé Depuis une quinzaine d'années, les matières organiques dont se délestent leurs détenteurs, font l'objet de politiques et stratégies d'écologisation. Cet article, consacré au cas du périurbain nantais, en analyse les enjeux à partir du concept de noeud sociométabolique, point d'intersection entre une diversité d'éléments sociotechniques. L'analyse repose sur les derniers rapports d'activités des autorités publiques locales et sur une enquête menée en 2024. L'élaboration d'une typologie a permis d'analyser les enjeux propres à chaque type de traitement. La délégitimation du tri mécano-biologique et du dépôt de déchets verts en déchetterie pose la question du devenir des communs négatifs. La promotion du compostage aux échelles les plus fines renouvelle les questions de conduite des pratiques. Les contraintes pesant sur les perspectives de méthanisation interrogent la pertinence de la valorisation énergétique. La stratégie de relocalisation sociotechnique du traitement n'évacue pas les questions d'interterritorialité. Pour l'heure, la volonté de détachement des filières héritées de la massification de la gestion des ordures ménagères ne se traduit pas par une transformation du métabolisme des biodéchets. En outre, cette stratégie s'inscrit dans des problématiques de gouvernance multiscalaire et d'interaction entre différentes activités : les différentes filières du secteur des déchets et les secteurs de l'agriculture et de l'énergie.</p>
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