title: Biofuels from microalgae: lipid extraction and methane production from the residual biomass in a biorefinery approach.
abstract: Renewable fuels and energy are of major concern worldwide and new raw materials and processes for its generation are being investigated. Among these raw materials, algae are a promising source of lipids and energy. Thus, in this work four different algae have been used for lipid extraction and biogas generation. Lipids were obtained by supercritical CO2 extraction (SCCO2), while anaerobic digestion of the lipid-exhausted algae biomass was used for biogas production. The extracted oil composition was analyzed (saturated, monounsaturated and polyunsaturated fatty acids) and quantified. The highest lipid yields were obtained from Tetraselmis sp. (11%) and Scenedesmus almeriensis (10%), while the highest methane production from the lipid-exhausted algae biomass corresponded to Tetraselmis sp. (236mLCH4/gVSadded).
authors.affiliation: Agricultural Technological Institute of Castilla y León, Ctra. Burgos, km. 119, 47071 Valladolid, Spain. Electronic address: dhgon@hotmail.com.
authors.forename: D
authors.initials: D
authors.lastname: Hernández
authors.affiliation: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors.forename: M
authors.initials: M
authors.lastname: Solana
authors.affiliation: Agricultural Technological Institute of Castilla y León, Ctra. Burgos, km. 119, 47071 Valladolid, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Riaño
authors.affiliation: Agricultural Technological Institute of Castilla y León, Ctra. Burgos, km. 119, 47071 Valladolid, Spain. Electronic address: gargonmi@itacyl.es.
authors.forename: M C
authors.initials: MC
authors.lastname: García-González
authors.affiliation: Department of Industrial Engineering, University of Padova, Via Marzolo 9, 35131 Padova, Italy.
authors.forename: A
authors.initials: A
authors.lastname: Bertucco
mesh_terms: D000693:Anaerobiosis; D001674:Bioelectric Energy Sources; D056804:Biofuels; D018533:Biomass; D002245:Carbon Dioxide; D000460:Chlorophyta / Q000378:metabolism*; D025924:Chromatography, Supercritical Fluid / Q000295:instrumentation / Q000379:methods; D008055:Lipids / Q000302:isolation & purification*; D008697:Methane / Q000096:biosynthesis*; D058086:Microalgae / Q000378:metabolism*; D008872:Microwaves; D044444:Scenedesmus / Q000378:metabolism*
chemical_list: D056804:Biofuels; D008055:Lipids; D002245:Carbon Dioxide; D008697:Methane
keywords: Anaerobic digestion; Biorefinery; Lipid extraction; Microalgae; Supercritical carbon dioxide