Agricultural crop-based biofuels – resource efficiency and environmental performance including direct land use changes

Börjesson, Pål; Tufvesson, Linda

doi:10.1016/j.jclepro.2010.01.001

Cited by 268 publications

(185 citation statements)

References 41 publications

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“…The LHV for the pellets that had a DM content of 88 % was 21.0 MJ/kg DM. The energy requirement to harvest and transport the straw an average distance of 50 km was also included in the calculation and was set to 0.025 MJ/MJ dry biomass [52]. The energy efficiency of the products was calculated as the ratio of the energy flow (in MW) of the products to the ingoing energy flow, as shown in Eq.…”

Section: Energy Supplymentioning

confidence: 99%

Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Joelsson

Dienes

Kovács

et al. 2016

Sustain Chem Process

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Background: Production of ethanol and biogas from acetic acid-impregnated steam-pretreated wheat straw was investigated. The solid fraction after pretreatment was used at high solids concentrations to generate ethanol by simultaneous saccharification and fermentation (SSF). The residual streams were evaluated with regard to biogas production. The experimental results were used to perform a techno-economic evaluation of a biorefinery concerning ethanol, raw biogas, pellet, and electricity production at various solid contents and residence times in the fermentation step. The configurations were also altered to include biogas upgrading to vehicle fuel quality or fermentation of xylose to ethanol. Results:At a water-insoluble solids (WIS) content in the SSF of between 10 and 20 %, the ethanol yields exceeded 80 %, the highest being 86 % at 12.5 % WIS, expressed as % of the theoretical maximum, based on the glucan content in SSF. Anaerobic digestion of wheat straw hydrolysate and stillage yielded 4.8 and 1.0-1.2 g methane/100 g dry straw, respectively, in 7-day experiments. Maximum recovery of overall product was achieved when SSF was run at between 10 and 15 % initial WIS content, for which the product yields from 100 g dry wheat straw were 16.1-16.3 g ethanol, 5.8-6.0 g methane, and 25 g lignin-rich solid residue. The net present value (NPV) was negative at discount rate of 11 % but positive at 5 % discount rate for all configurations. The 20 % WIS configuration with a residence time of 96 h in the fermentation stage attained the highest NPV. The minimum ethanol selling price varied between 0.72 and 0.87 EUR/L ethanol when the biogas was unchanged and it decreased to between 0.46 and 0.60 EUR/L ethanol when the biogas was upgraded to vehicle fuel quality or when xylose was converted to ethanol. Conclusions:According to the techno-economic assessment, a process that is based on the fermentation of only hexoses to ethanol, and production of raw biogas from xylose is not profitable under the economic assumptions including 11 % discount rate in the evaluation. However, the profitability of a plant can be improved by biogas upgrading to vehicle fuel quality or fermentation of xylose to ethanol.

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Section: Energy Supplymentioning

confidence: 99%

Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Joelsson

Dienes

Kovács

et al. 2016

Sustain Chem Process

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“…The importance of a given impact category varies depending on the type of chemical assessed [76]. More complex chemistry (such as synthesis of fine and pharmaceutical chemicals) often requires more processing steps and thus, often leads to more waste generation and a higher energy consumption, than bulk chemicals [34].…”

Section: Tools For Environmental Assessment: Life Cycle Assessmentmentioning

confidence: 99%

Application of environmental and economic metrics to guide the development of biocatalytic processes

Lima-Ramos¹,

Tufvesson²,

Woodley³

2014

Green Processing and Synthesis

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Abstract:The increasing industrial interest in biocatalytic processes is predominantly driven by the need for selective chemistry, with high reaction yield (Y reaction ) and few side reactions, as well as the need for optically pure chiral molecules (in particularly in the pharmaceutical industry). Interestingly, it is often argued that the mild conditions frequently used in biocatalytic reactions (ambient temperature and pressure, neutral pH and aqueous-based media) automatically lead to environmentally-friendly and cost-effective production processes. However, such a conclusion is not justified without the use of adequate tools to evaluate the performance of a process, in particular during process development. Nevertheless, at the early development stage, evaluation of biocatalytic processes is not a trivial task, not only due to the lack of data, but also because at this stage many of the biocatalytic processes are not yet fully optimized. Hence, in this paper we propose the use of a range of tools which can be used to guide process development, research tasks and support decision-making. Three sets of metrics are identified, each for use at different stages of process development (route selection, early development and late development), each with different objectives.

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“…However, the environmental issue and significant economic problems are tightly associated with the first generation of biofuel, the land area needed for growing the crops for bio-fuel production will be in competition with for food production, leading to severe food shortage problems [11,12]. In addition, the increase in the crop harvesting rates for biofuel production has also raised the concerns about the fertilizer and pesticide pollution, eutrophication, and carbon debt [13][14][15]. Therefore, due to those limitations of the first generation of biofuels, the second and third generation of biofuels have also been developed [14].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the increase in the crop harvesting rates for biofuel production has also raised the concerns about the fertilizer and pesticide pollution, eutrophication, and carbon debt [13][14][15]. Therefore, due to those limitations of the first generation of biofuels, the second and third generation of biofuels have also been developed [14]. Low-cost agricultural residues (corn Stover, wheat straw) and agricultural by-products (rice hulls, corn fibre) have been explored as the potential raw materials for the biofuel production [2].…”

Section: Introductionmentioning

confidence: 99%

Subcritical water hydrolysis of durian seeds waste for bioethanol production

et al. 2015

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The feasibility of bioethanol production using durian seed waste was investigated in this study. The effects of hydrolysis parameters (temperature, time, pressure and solid to water ratio) on the yields of reducing sugars and bioethanol were also examined. Central composite design was used to determine the optimum conditions of both reducing sugars yields obtained from hydrolysis stage and ethanol from reducing sugars fermentation. The optimized values for subcritical water process of durian seeds to produce reducing sugars were achieved at temperature of 139.8°C; solid to water ratio of 1:30; pressure of 30 bar; and reaction time of 3.58 h with 32.37 % yield of reducing sugars. The fermentation of 20 g L -1 reducing sugars for 72 h gave the highest ethanol concentration, i.e., 9.85 g L -1 .

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Agricultural crop-based biofuels – resource efficiency and environmental performance including direct land use changes

Cited by 268 publications

References 41 publications

Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Combined production of biogas and ethanol at high solids loading from wheat straw impregnated with acetic acid: experimental study and techno-economic evaluation

Application of environmental and economic metrics to guide the development of biocatalytic processes

Subcritical water hydrolysis of durian seeds waste for bioethanol production

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