Évaluation de la gestion et caractérisation des déchets solides des tanneries
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L'industrie du tannage g�n�re d'importantes quantit�s de d�chets solides lors du traitement du cuir et, par la suite, lors du traitement des effluents. Dans cette optique, la pr�sente �tude a port� sur l'�valuation des pratiques de gestion des d�chets solides et sur la caract�risation physico-chimique des d�chets solides issus des tanneries, afin de proposer des solutions adapt�es � la gestion de ces d�chets. L'�valuation a montr� que les types de d�chets solides des tanneries sont le sel d�poussi�r�, les chutes de peaux brutes, les poils, les r�sidus de d�graissage, les d�chets de refendage, les chutes de saumure, les copeaux de chrome, les chutes de cro�te, les chutes de cuir fini et les boues. Les taux de production de chaque type de ces d�chets solides ont �t� d�termin�s � l'aide de techniques d'analyse du bilan mati�re. Les d�chets solides ont �t� caract�ris�s en termes de pH, de teneur en humidit�, de compos�s organiques volatils, de teneur en cendres, de pouvoir calorifique, de teneur en carbone, de teneur totale en azote, de rapport carbone/azote, de teneur en chrome, de teneur en sodium et de teneur en calcium � l'aide de m�thodes standard d'analyse des d�chets solides. Sur la base des caract�ristiques physico-chimiques des d�chets solides, deux options technologiques thermochimiques fondamentales de valorisation �nerg�tique des d�chets ont �t� propos�es: le processus de conversion biochimique et le compostage.
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