Abstract
Due to new possibilities for using sugarcane (Saccharum spp.) trash for electricity generation, and the production of 2nd generation ethanol and others chemicals, the interest for its recovery has increased. However, the question of how much trash can be removed from sugarcane field still needs to be clarified. This study evaluated the amount of dry matter, nutrients content, structural compounds and efficiency of the enzymatic hydrolysis of the hydrothermal pretreated materials for tops and dry leaves in samples from sugarcane varieties. Tops and dry leaves present differences in nutrients content and moisture. Therefore, the amount of trash to be collected should not be simply based on percentages, but also should take into account the different fractions of the crop residues. For instance, around 80 % of N, P and K were derived from tops. Therein, the environmental indicators of the entire chain of sugarcane could be benefited because more nutrients would be recycled and less mineral fertilizers might be used for sugarcane production if tops are left on the field. Further, the tops have seven times more moisture than dry leaves and higher amounts of extractives (organic compounds of low molecular weight). Moreover, as the result of yield obtained in the pretreatment steps for dry leaves were superior to the tops and the glucose yields obtained in the enzymatic hydrolysis step were similar, it can be predicted that for second generation ethanol production, it is more viable to recover parts of the dry leaves fraction, leaving the tops on the field.
Highlights
Sugarcane (Saccharum spp.) has significant importance in the tropical and subtropical regions of the world, especially due to the sugar and ethanol production
This study evaluated the amount of dry matter, nutrients content, structural compounds and efficiency of the enzymatic hydrolysis of the hydrothermal pretreated materials for tops and dry leaves in samples from sugarcane varieties
As the result of yield obtained in the pretreatment steps for dry leaves were superior to the tops and the glucose yields obtained in the enzymatic hydrolysis step were similar, it can be predicted that for second generation ethanol production, it is more viable to recover parts of the dry leaves fraction, leaving the tops on the field
Summary
Sugarcane (Saccharum spp.) has significant importance in the tropical and subtropical regions of the world, especially due to the sugar and ethanol production. The sugarcane crop has drawn global interest as a raw material for the production of energy, since it presents highly positive energy and greenhouse gases balances (Macedo et al, 2008; Renouf et al, 2008; Smeets et al, 2009). In Brazil, with the advancement of mechanized harvesting of sugarcane without previous burning, a substantial portion of crop residues, composed by plant tops and dry leaves, is left on the soil, generating a residue known in the sugarcane industry as trash. A substantial group of companies have started to consider alternative uses for this crop residue, which may represent between 10 to 30 t ha−1 year−1 dry biomass, depending on the sugarcane yield (Trivelin et al, 1995; Vitti et al, 2011; Fortes et al, 2012)
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