Ethanol production in biorefineries using lignocellulosic feedstock – GHG performance, energy balance and implications of life cycle calculation methodology

Karlsson, Hanna; Börjesson, Pål; Hansson, Per‐Anders; Ahlgren, Serina

doi:10.1016/j.jclepro.2014.07.029

Cited by 83 publications

(52 citation statements)

References 37 publications

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“…This is accounted for in the FFRP indicator, where 1 MJ ethanol replaces less fossil fuels than 1 MJ diesel when considering driving distance. Although biodiesel has higher FFRP per MJ fuel, a previous study on combined ethanol and biogas production (both pentose and hexose sugars are fermented to ethanol) found a higher FFRP for ethanol (−8.56 MJ) [29] than in the present study (−5.74 MJ in the base case). The higher FFRP was primarily due to higher energy output, but also lower NER value (0.2 MJ prim /MJ fuel).…”

Section: Discussioncontrasting

confidence: 74%

“…The higher fossil fuel use (NER indicator) in the present study was due to the lower energy output (the fossil fuels used were divided over fewer MJ) and higher fossil fuel use during processing, which was mainly due to the ammonia used for yeast cultivation and to methanol and hexane, which are not used in ethanol production. Enzyme production for hydrolysis was the main user of fossil fuels, as is also the case for ethanol [29]. Lignocellulose degrading enzymes are constantly being improved and currently enzyme products with significantly lower energy use for the same conversion efficiency are being introduced (personal communication Jesper Kløverpris, Novozymes A/S, 19 April 2016).…”

Section: Discussionmentioning

confidence: 99%

“…Transport distance for wheat straw in southern Sweden has been estimated at 45 km for a plant processing 120,000 metric tons (t) annually [28] and the same transport distance was assumed for the present study, although the annual straw requirements were substantially lower. Energy use for transport, including empty return, was assumed to be 0.066 MJ/kg straw DM [29]. …”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

A systems analysis of biodiesel production from wheat straw using oleaginous yeast: process design, mass and energy balances

Karlsson

Ahlgren

Sandgren

et al. 2016

Biotechnol Biofuels

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BackgroundBiodiesel is the main liquid biofuel in the EU and is currently mainly produced from vegetable oils. Alternative feedstocks are lignocellulosic materials, which provide several benefits compared with many existing feedstocks. This study examined a technical process and its mass and energy balances to gain a systems perspective of combined biodiesel (FAME) and biogas production from straw using oleaginous yeasts. Important process parameters with a determining impact on overall mass and energy balances were identified and evaluated.ResultsIn the base case, 41% of energy in the biomass was converted to energy products, primary fossil fuel use was 0.37 MJprim/MJ produced and 5.74 MJ fossil fuels could be replaced per kg straw dry matter. The electricity and heat produced from burning the lignin were sufficient for process demands except in scenarios where the yeast was dried for lipid extraction. Using the residual yeast cell mass for biogas production greatly increased the energy yield, with biogas contributing 38% of total energy products.ConclusionsIn extraction methods without drying the yeast, increasing lipid yield and decreasing the residence time for lipid accumulation are important for the energy and mass balance. Changing the lipid extraction method from wet to dry makes the greatest change to the mass and energy balance. Bioreactor agitation and aeration for lipid accumulation and yeast propagation is energy demanding. Changes in sugar concentration in the hydrolysate and residence times for lipid accumulation greatly affect electricity demand, but have relatively small impacts on fossil energy use (NER) and energy yield (EE). The impact would probably be greater if externally produced electricity were used.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-016-0640-9) contains supplementary material, which is available to authorized users.

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Section: Discussioncontrasting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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A systems analysis of biodiesel production from wheat straw using oleaginous yeast: process design, mass and energy balances

Karlsson

Ahlgren

Sandgren

et al. 2016

Biotechnol Biofuels

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“…On the other hand, environmental impacts per process unit, from the installation, construction, decommissioning, infrastructure, machinery, etc., have been considered negligible during the lifetime of a biorefinery facility. This has been a common practice in other biorefinery life‐cycle assessment studies The cogeneration unit of the plant supplies electricity to SS1, SS2, SS3, SS4 (except for on‐site enzyme production), SS6, SS7, SS8.…”

Section: Methodsmentioning

confidence: 99%

Comparative evaluation of lignocellulosic biorefinery scenarios under a life‐cycle assessment approach

Bello

Ríos

Feijoo

et al. 2018

Biofuels Bioprod Bioref

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The exploitation of lignocellulosic materials with the aim of producing high value‐added products will potentially counteract concerns such as depletion of fossil resources or exponential population growth. The present study focuses on the assessment of an integrated process based on organosolv fractionation of residual beech woodchips, with the objective of implementing concepts such as circular economy or process integration. The life‐cycle assessment (LCA) methodology and the eco‐efficiency concept allow for a holistic analysis of sustainability in terms of the system's environmental approach. The results show that the pre‐treatment of biomass together with the energy demands of the process and enzyme production constitute the hotspots of the system. Analyzing the system by means of the ecoefficiency indicator demonstrates that broadening the multi‐production spectrum of a biorefinery provides better results when production volume and processing steps fit environmental and techno‐economical requirements. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…In countries like Brazil and the US, the production of ethanol from sugar cane bagasse and corn has been implemented into the main market of fuels resulting in an attractive option for industrial applications with low emissions of "greenhouse" gases (Karlsson et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Energy assessment of different configurations for the ethanol production process from lignocellulosic biomass

Triana

Fraga

Sørensen

2015

12th International Symposium on Process Systems Engineering and 25th European Symposium on Computer Aided Process Engineering

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Ethanol production in biorefineries using lignocellulosic feedstock – GHG performance, energy balance and implications of life cycle calculation methodology

Cited by 83 publications

References 37 publications

A systems analysis of biodiesel production from wheat straw using oleaginous yeast: process design, mass and energy balances

A systems analysis of biodiesel production from wheat straw using oleaginous yeast: process design, mass and energy balances

Comparative evaluation of lignocellulosic biorefinery scenarios under a life‐cycle assessment approach

Energy assessment of different configurations for the ethanol production process from lignocellulosic biomass

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