Effect of different steam explosion conditions on methane potential and enzymatic saccharification of birch

Vivekanand, Vivekanand; Olsen, Espen; Eijsink, Vincent G. H.; Horn, Svein Jarle

doi:10.1016/j.biortech.2012.09.118

Cited by 132 publications

(82 citation statements)

References 33 publications

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“…Most compounds in lignocellulosic biomass can be degraded to biogas, but the AD of aromatic compounds, such as lignin, is generally believed to be difficult [8,9]. The degradability of lignin, however, can be enhanced by pretreatment, leading to depolymerisation reactions, which result in increased availability of lignin to microorganisms [10].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

“…Pretreatment is also beneficial for methane production, as it improves the initial production rate [10,16] and methane yield [10,17]. Steam pretreatment, also known as steam explosion, is one of the most efficient methods for processing lignocellulosic biomass and has been used successfully for wheat straw [1,17,18].…”

Section: Introductionmentioning

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 maximum content (37.16%) was observed at the highest severity (4.25) evaluated. The increase of the amount of soluble lignin measured for higher severity indicates the formation of pseudo-lignin from xylan degradation at higher temperatures [25][26][27]. The xylan is degraded at higher severity to 13.72% at 4.13 in comparison to the xylan value-34.59%-of the corn cobs pretreated at soft condition (160 °C, 20 minutes).…”

Section: Resultsmentioning

confidence: 91%

Corncobs as Substrate for Oleaginous Yeast–Pretreatment via Steam Explosion and Hydrolysis

Kahr¹,

Pointner²,

Krennhuber³

et al. 2015

JESE-A

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Corn cobs are a promising lignocellulosic substrate for the production of biofuels like bioethanol via conventional yeast or biodiesel via oleaginous yeast. Pretreatment of the substrate is essential for further hydrolysis and fermentation steps. This study focused on the steam explosion method as pretreatment. Therefore, different steam explosion severities were evaluated. (untreated) to a maximum of 214.9 g·kg -1 dry matter (190 °C/30 min). Furthermore, the mass recovery was calculated. At harsher pretreatment conditions, a significant mass loss was observed, estimated by the ash content in the recovered dry matter. The lowest recovery rate was observed for SF = 4.13 (190 °C/30 min) with 68.39%. The produced inhibitors were evaluated.

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“…Converting hemicellulose into xylose is essential for value-added product production, such as xylitol. Many methods have been developed for this purpose, such as steam explosion, dilute acid hydrolysis, alkaline treatment, enzymatic hydrolysis, and γ-valerolactone (GVL) (Yang et al 2013;Vivekanand et al 2013;Luterbacher et al 2014). Among these, dilute acid hydrolysis showed promising application because of its low cost and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Dilute Sulfuric Acid Hydrolysis of Pennisetum (sp.) Hemicellulose

Tian¹,

Chen²,

Ji³

et al. 2017

BioResources

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Effect of different steam explosion conditions on methane potential and enzymatic saccharification of birch

Cited by 132 publications

References 33 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

Corncobs as Substrate for Oleaginous Yeast–Pretreatment via Steam Explosion and Hydrolysis

Dilute Sulfuric Acid Hydrolysis of Pennisetum (sp.) Hemicellulose

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