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<dc:title xml:lang="fr">Récupération et valorisation de biomolécules d’effluents de papeterie par procédés membranaires</dc:title>
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<dcterms:abstract xml:lang="fr">L'objectif est la valorisation de biomolécules issues des eaux du procédé thermomécanique de fabrication de pâte à papier. La séparation des familles de biomolécules doit permettre de générer plusieurs fractions ayant un intérêt pour l'industrie cosmétique et phytosanitaire. Les terpènes, hémicelluloses, lignine et lignanes ont été identifiés dans ces eaux. Cependant, le choix s'est porté sur la valorisation de la lignine et des lignanes pour des raisons de sélectivité et de valeur ajoutée. La flottation et la filtration par membrane 150 kDa permettent d'effectuer une clarification par élimination de 100% des terpènes et de 59% des hémicelluloses. Le fractionnement de la lignine et des lignanes est effectué avec des membranes de 1 kDa et 300Da à pH 4 pour obtenir deux rétentats contenant respectivement 96% de lignine et 58% de lignanes par rapport aux polyphénols totaux. Une étude technico-économique de faisabilité de la filière de séparation est réalisée à l'échelle semi-industrielle .</dcterms:abstract>
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