First and Second Generation of Ethanol Production for Five Sweet Sorghum Cultivars during Soft Dough Grain
Emmanuel Damilano Dutra *
Universidade Federal de Pernambuco, Av. Prof. Luís Freire, 1000, CEP 50740-540, Cidade Universitária, Recife, PE, Brazil
Bárbara Ribeiro Alves Alencar
Universidade Federal de Pernambuco, Av. Prof. Luís Freire, 1000, CEP 50740-540, Cidade Universitária, Recife, PE, Brazil
Janis Joplim Galdino
Universidade Federal de Pernambuco, Av. Prof. Luís Freire, 1000, CEP 50740-540, Cidade Universitária, Recife, PE, Brazil
Jose Nildo Tabosa
Instituto Agronômico de Pernambuco, Av. General San Martin, 1371, 50761-000, Recife, PE, Brazil
Rômulo Simões Cezar Menezes
Universidade Federal de Pernambuco, Av. Prof. Luís Freire, 1000, CEP 50740-540, Cidade Universitária, Recife, PE, Brazil
Renisson Neponuceno de Araújo Filho
Universidade Federal do Tocantins, Rua Badejós, Lote 7, Chácaras 69/72, s/n - Zona Rural, CEP 77402-970, Gurupi, TO, Brazil
Dário Costa Primo
Universidade Federal de Pernambuco, Av. Prof. Luís Freire, 1000, CEP 50740-540, Cidade Universitária, Recife, PE, Brazil
Victor Casimiro Piscoya
Universidade Federal Rural de Pernambuco, Rua Dom Manoel de Medeiros, s/n, Dois Irmãos, CEP 52171-900, Recife, PE, Brazil.
Jadson Emanuel Lopes Antunes
Universidade Federal do Piauí, Campus Ministro Petrônio Portela, s/n, Ininga, CEP 64049-550, Teresina, PI, Brazil
*Author to whom correspondence should be addressed.
Abstract
This study we aimed to identify how the harvest period of the stems from 5 sweet sorghum cultivars influences the production of sugar and ethanol under rainfed conditions in the municipality of Itambé, state of Pernambuco. Subsequently we evaluated the ethanol production from juice and bagasse of the different cultivars. The field experiment was evaluated in a factorial arrangement with two factors (5 cultivars and 3 harvest periods) and fours replications. The fermentation experiments, pretreatment and enzymatic hydrolysis were delineated in a completely randomized design in quadruplicate. Data obtained for all variables evaluated were submitted to an Analysis of Variance and the means compared by the Tukey test at 5% of probability. Results showed that the harvest period influenced the total soluble solids, and the harvest period of soft dough was chosen for assessments of ethanol production of first and second generation. Ethanol production from juice differed among cultivars with the best performance by cultivar SF 15. Significant differences were observed for the chemical composition of bagasses between cultivars, but there where no difference in efficiencies of enzymatic hydrolysis. The average conversion of cellulose in glucose was 64.87%. The cultivars of sweet sorghum biomass developed and adapted for the Northeastern region of Brazil showed potential for ethanol production from the juice and bagasse.
Keywords: Bioenergy, energy crops, biofuels, forest zone of Pernambuco