Effect of hydrothermal pretreatment of sunflower oil cake on biomethane potential focusing on fibre composition.

Victoria Fernández-Cegrí, M Angeles De la Rubia, Francisco Raposo, Rafael Borja

Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Padre García Tejero, 4, 41012 Seville, Spain.

Bioresource technology 2012 Nov

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The aim of this study was to elucidate the effect of hydrothermal pretreatment at 25, 100, 150 and 200°C on fibre composition and the biomethane potential of sunflower oil cake (SuOC). An increase in pretreatment temperature from 25 to 200°C caused a decrease in hemicellulose content in the solid pretreated fraction from 13 to 6% while the lignin content increased by 16%. Soluble compounds also increased with temperature. Digestion of solid fractions from pretreatments at 25, 100, 150 and 200°C in batch assays at 35±1°C resulted in methane yields of 114±9, 105±7, 82±7 and 53±8mL CH(4) g(-1)COD(added), respectively. The corresponding methane yields for the liquid fractions were 276±6, 310±4, 220±15 and 247±10mL CH(4) g(-1)COD(added), respectively. Therefore the overall methane yield was highest for SuOC pretreated at 100°C; however, this value was only 6.5% higher than that achieved after pretreatment at 25°C. Copyright © 2012 Elsevier Ltd. All rights reserved.

Citation

Victoria Fernández-Cegrí, M Angeles De la Rubia, Francisco Raposo, Rafael Borja. Effect of hydrothermal pretreatment of sunflower oil cake on biomethane potential focusing on fibre composition. Bioresource technology. 2012 Nov;123:424-9