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Juan David Villegas
École Polytechnique Fédérale de Lausanne
EngineeringBiomassGreenhouse gasBiofuelSustainability
9Publications
5H-index
403Citations
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Publications 9
Newest
#1Reeta Rani Singhania (National Institute for Interdisciplinary Science and Technology)H-Index: 26
#2Simone Chiesa (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 2
Last. AshokPandey (National Institute for Interdisciplinary Science and Technology)H-Index: 76
view all 7 authors...
The main aim of this study was to analyze dilute acid pretreatment for the Douglas fir wood in order to improve the efficiency of hydrolysis with an ultimate aim to produce bioethanol. Compositional analysis of the untreated Douglas fir biomass revealed the presence of 63.3 % carbohydrate of which 57.2 % was C6 sugars. The total lignin content was approximately 30 %. A partial fractional factorial design was opted for performing the pretreatment experiments employing sulfuric acid (H2SO4). Acid ...
2 CitationsSource
#1Edgard Gnansounou (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
#2A. DauriatH-Index: 11
Last. Luis Panichelli (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 9
view all 4 authors...
The promotion of biofuels as energy for transportation in the industrialized countries is mainly driven by the perspective of oil depletion, the concerns about energy security and global warming. However due to sustainability constraints, biofuels will replace only 10 to 15% of fossil liquid fuels in the transport sector. Several governments have defined a minimum target of GHG emissions reduction for those biofuels that will be eligible to public incentives, for example a 35% emissions reductio...
288 CitationsSource
Ethanol production from lignocellulosic residues has potential to significantly improve sustainability of biofuels for transport by avoiding land-use competition with food crops and reducing impacts related to agricultural inputs. However, high production costs remain bottleneck for large-scale development of this pathway. A huge potential exists in upgrading energy producing pathways into biorefineries in order to improve its economic performance and long-term sustainability. A promising genera...
14 Citations
Estimating greenhouse gas (GHG) balances of biofuels is subject to significant biases stemming from modelling choices about system definition and boundaries, functional unit, reference systems and allocation methods. This paper investigates extent to which these choices influence the results. After performing a comparison and constructive criticism of various modelling choices, life cycle assessment (LCA) of wheat-to-bioethanol was used as an illustrative case where bioethanol was blended with g...
25 Citations
#1Edgard GnansounouH-Index: 28
#2Luis PanichelliH-Index: 9
Last. Juan David VillegasH-Index: 5
view all 3 authors...
Increased worldwide concern about the sustainability of large-scale production of liquid biofuels for transport has led certain governments and institutions to start developing sustainability standards in order to assess the environmental and social performances of this production. Several initiatives are being developed worldwide and some controversial issues and questions arise when trying to tackle sustainability assessment in this context. This document comes to enrich a sometimes harsh disc...
3 Citations
#1Edgard GnansounouH-Index: 28
#2A. DauriatH-Index: 11
Last. Juan David VillegasH-Index: 5
view all 4 authors...
The interest in developing biofuels has rapidly increased during the last decades followed by a strong controversy about their sustainability. Diverting a large amount of land from agriculture to fuels, impacting forests and grasslands, loss of biodiversity due to large monocropped fields are some threats that inhibit the momentum towards a significant substitution of fossil fuels by biofuels. From a methodological point of view, several estimations of the reduction of greenhouse gas (GHG) emiss...
3 Citations
#1Edgard Gnansounou (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
#2Luis PanichelliH-Index: 9
Last. Juan David VillegasH-Index: 5
view all 4 authors...
Increased demand for biofuels is expected to produce changes in the present land-use configuration. Furthermore there is a growing concern about the effect of land-use change on biodiversity, food supply, soil and water quality. Biofuels production on current land and use of biomass in a given region can induce displacement of activities and land-use changes elsewhere. This effect is known as indirect land-use change (ILUC). Due to changes in the carbon stock of the soil and the biomass, indirec...
18 Citations
#1Edgard GnansounouH-Index: 28
#2Luis PanichelliH-Index: 9
Last. Juan David VillegasH-Index: 5
view all 4 authors...
Increased demand for biofuels is expected to produce changes in the present land-use configuration. Furthermore there is a growing concern about the effect of land-use change on biodiversity, food supply, soil and water quality. Biofuels production on current land and use of biomass in a given region can induce displacement of activities and land-use changes elsewhere. This effect is known as indirect land-use change (ILUC). Due to changes in the carbon stock of the soil and the biomass, indirec...
32 Citations
#1Edgard GnansounouH-Index: 28
#2Luis PanichelliH-Index: 9
Last. Juan David VillegasH-Index: 5
view all 3 authors...
The Southern African Development Community (SADC) has evolved in 1992 from the former Southern African Development Coordination Conference (SADCC) existing since 1980. The SADC aims at regional integration, sustainable growth and alleviation of poverty in the member countries. Fourteen countries make up the Southern African Development Community (SADC): Angola, Botswana, Democratic Republic of Congo, Lesotho, Madagascar, Malawi, Mauritius, Mozambique, Namibia, Seychelles, South Africa, Swaziland...
5 Citations
1