title: Effect of hydrothermal pretreatment of sunflower oil cake on biomethane potential focusing on fibre composition.
abstract: 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.
authors.affiliation: Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Avenida Padre García Tejero, 4, 41012 Seville, Spain.
authors.forename: Victoria
authors.initials: V
authors.lastname: Fernández-Cegrí
authors.forename: M
authors.initials: M
authors.lastname: Angeles De la Rubia
authors.forename: Francisco
authors.initials: F
authors.lastname: Raposo
authors.forename: Rafael
authors.initials: R
authors.lastname: Borja
mesh_terms: D061249:Batch Cell Culture Techniques; D056804:Biofuels / Q000032:analysis*; D001709:Biotechnology / Q000379:methods*; D007700:Kinetics; D008697:Methane / Q000032:analysis*; D010938:Plant Oils / Q000737:chemistry*; D000074242:Sunflower Oil; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D056804:Biofuels; D010938:Plant Oils; D000074242:Sunflower Oil; D014867:Water; D008697:Methane