Liquefaction of lignocellulosic biomass for methane production: A review

Ghimire, Nirmal; Bakke, Rune; Bergland, Wenche Hennie

doi:10.1016/j.biortech.2021.125068

Cited by 51 publications

(20 citation statements)

References 124 publications

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“…Since hydrolysis is one of the limiting steps of anaerobic digestion due to slow rates and incomplete degradation, one of the main factors that could explain the better performance of the liquid hydrolysate is the higher biodegradability of the soluble carbohydrates that were solubilized during pretreatment. These sugars are more readily available when compared to cellulose and hemicellulose, as these polymers still need a hydrolysis step to be metabolized by the microbial consortium 7,27 …”

Section: Resultsmentioning

confidence: 99%

“…However, even in that case, pretreatment was demonstrated as a necessary step to reduce biomass recalcitrance and to favor the contact between lignocellulosic substrate and enzyme. In that way, it improved mass transfer from the solid to the liquid phase and enhanced the hydrolysis step 7,27 …”

Section: Resultsmentioning

confidence: 99%

“…These sugars are more readily available when compared to cellulose and hemicellulose, as these polymers still need a hydrolysis step to be metabolized by the microbial consortium. 7,27 Thus, when the whole pretreated coffee husk was used (solid and liquid fractions), slower degradable sugars from the solid fraction may have hindered the process rate and methane yield. However, even in that case, pretreatment was demonstrated as a necessary step to reduce biomass recalcitrance and to favor the contact between lignocellulosic substrate and enzyme.…”

Section: Biogas Productionmentioning

confidence: 99%

“…Owing to its complex and recalcitrant structure, pretreatment techniques were reported as necessary to increase biodegradability. To this end, steam explosion (SE) pretreatment at high temperatures with sudden pressure drop has been described as successful for bioconversion with a low capital investment and low environmental impact, particularly when compared to more conventional pretreatments, such as those applying chemical products 7 …”

Section: Introductionmentioning

confidence: 99%

“…To this end, steam explosion (SE) pretreatment at high temperatures with sudden pressure drop has been described as successful for bioconversion with a low capital investment and low environmental impact, particularly when compared to more conventional pretreatments, such as those applying chemical products. 7 SE pretreatment of coffee husks generates a solid fraction, which is rich in cellulignin, and a liquid fraction from hemicellulose solubilization, rich in C5 sugars. 8 A previous study successfully verified the methane production increase from the whole biomass (liquid and solid fractions) after SE of coffee husks.…”

Section: Introductionmentioning

confidence: 99%

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Steam explosion pretreatment of coffee husks: a strategy towards decarbonization in a biorefinery approach

Fonseca

Silva

Fernandes

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Coffee husks (CH) are an abundant lignocellulosic residue that can be converted into biofuels and bioproducts through sustainable and economical processes in a biorefinery approach. For that, steam explosion (SE) pretreatment stands out as a technique to overcome its recalcitrant nature and enable byproduct valorization. In this study, solid and liquid fractions were separated after pretreatment for saccharification and biogas production, respectively. The research relevance relies on the contribution to environment decarbonization and monetization of decarbonization credits (CBIO) generated from the production of renewable fuel from waste biomass under different operational conditions (with and without pretreatment). RESULTS Liquid hydrolysate generated by SE condition at 210 °C and 15 min led to the highest biomethane production (292 NmL CH4 g CODfed−1). Similarly, high‐severity pretreatment also favored the enzymatic hydrolysis yield of the solid fraction (49%). In terms of environment decarbonization, SE promoted not only a lower carbon intensity when compared to the process without any pretreatment (3.8 vs. 6.4 g CO2eq MJ−1), but also increased the monetization of decarbonization credits by 175%, which represented a potential revenue of US $1 481 330. CONCLUSION High temperatures of SE pretreatment of CH at 210 °C were able to promote biogas production and fermentable sugars. In addition, the process reduced carbon emissions and increased the revenue from CBIO commercialization. Therefore, SE proved to be a sustainable and economic alternative for consideration in new green businesses from lignocellulosic residues such as CH. © 2021 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Biogas Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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