CONICET | Buscador de Institutos y Recursos Humanos

In this work, the behavior during thermaltreatment processes of marcs, stalk and peach pits, from thewineries, canning and the jam industries was studied.Theimmediate and elemental analysis are realized.The studiedagro-industrial wastes have higher water content than 30%,suggesting that these wastes should be dried before thethermal treatment. The ash contents are smaller than 7%,considering these contents low.The ultimate analysis showedhigher oxygen concentrations present in the studied agroindustrialwastes, decreasing the HHV. The trace elementscontents in these wastes are determined too. These elementsremain in the char/ash fraction of the different pyrolysisproducts, during thermal treatment under inert atmosphere.Thermal decomposition of the studied wastes was studied ininert nitrogen atmosphere. Their decompositions proceedthrough three stages of weight loss, dehydration, activepyrolysis and passive pyrolysis. The maximum weight losstook place during the active pyrolysis step. In this stage, thepeach pits exhibit the most prominent due to the highercontent of hemicellulose. Another reason can be thedifference of elements concentrations such us the Ca. Thiselement is present in smaller concentration in the peachpits.Themarcs decomposing at lower temperature comparedwith the other biomasses. It also has the lowest mass loss.This behavior might be associated with the highest content ofextractives in its structure. The higher value of activationenergy was obtained for the peach pits, meaning slowerreaction. The reaction orders were smaller than 1 for thestudied agro-industrial wastes.