Assessment of sugarcane trash for agronomic and energy purposes in Brazil
Franco, Henrique Coutinho Junqueira(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol) | Pimenta, Maria Teresa Borges(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol) | Carvalho, João Luís Nunes(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol) | Magalhães, Paulo Sérgio Graziano(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol ,Universidade Estadual de Campinas FEAGRI) | Rossell, Carlos Eduardo Vaz(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol) | Braunbeck, Oscar Antonio(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol) | Vitti, André Cesar(Agência Paulista de Tecnologia dos Agronegócios) | Kölln, Oriel Tiago(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol) | Rossi Neto, João(Centro Nacional de Pesquisa em Energia e Materiais CTBE - Laboratório Nacional de Ciência e Tecnologia do Bioetanol)
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.
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