Techno-economic Feasibility of Extrusion as a Pretreatment Step for Biogas Production from Grass

Souza, Marcella Fernandes de; Devriendt, Nausikaa; Willems, Bernard; Guisson, Ruben; Biswas, Joyoti; Meers, Erik

doi:10.1007/s12155-021-10287-z

Cited by 14 publications

(9 citation statements)

References 28 publications

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“…Expansion could effectively decrease or inhibit both genera. Since the lignocellulosic degrading enzyme secreted by I. lacteus catalyzed lignin oxidation while consuming molecular oxygen, and the high temperature and pressure during expansion also extracted a large amount of fermentable sugars (Souza et al 2022 ), low oxygen conditions were easily formed in the later stage of EIL treatment, thereby promoting the growth of LAB. Weissella and Pediococcus are known to function as the early initiators of lactic acid fermentation (Bao et al 2022 ; You et al 2021 ).…”

Section: Discussionmentioning

confidence: 99%

“…Expansion is a kind of thermo-mechanical pretreatment, which involves high friction, extrusion, and shear between the feeding screw, straw and the inner wall of the machine to provide additional heat and energy, forming a high temperature and pressure environment (Guiao et al 2022 ; Souza et al 2022 ). After the pressure is released at discharge port, the straw explosion occurs, causing depolymerization of macromolecules and enhancing their biodegradability (Cao et al 2024 ; Duque et al 2017 ).…”

Section: Introductionmentioning

confidence: 99%

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Enhanced lignin degradation by Irpex lacteus through expanded sterilization further improved the fermentation quality and microbial community during the silage preservation process

Cao,

Cai,

Zuo

et al. 2024

Bioresour. Bioprocess.

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Traditional autoclaving, slow degradation rate and preservation of biomass treated by fungi are the main factors restricting biological treatment. In our previous studies, strains with high efficiency and selective lignin degradation ability were obtained. To further solve the limiting factors of biological treatment, this paper proposed a composite treatment technology, which could replace autoclaves for fungal treatment and improve the preservation and utilization of fungal-pretreated straw. The autoclaved and expanded buckwheat straw were, respectively, degraded by Irpex lacteus for 14 days (CIL, EIL), followed by ensiling of raw materials (CK) and biodegraded straw of CIL and EIL samples with Lactobacillus plantarum for different days, respectively (CP, CIP, EIP). An expansion led to lactic acid bacteria, mold, and yeast of the samples below the detection line, and aerobic bacteria was significantly reduced, indicating a positive sterilization effect. Expansion before I. lacteus significantly enhanced lignin selective degradation by about 6%, and the absolute content of natural detergent solute was about 5% higher than that of the CIL. Moreover, EIL decreased pH by producing higher organic acids. The combination treatment created favorable conditions for ensiling. During ensiling, EIP silage produced high lactic acid about 26.83 g/kg DM and the highest acetic acid about 22.35 g/kg DM, and the pH value could be stable at 4.50. Expansion before I. lacteus optimized the microbial community for ensiling, resulting in EIP silage co-dominated by Lactobacillus, Pediococcus and Weissella, whereas only Lactobacillus was always dominant in CP and CIP silage. Clavispora gradually replaced Irpex in EIP silage, which potentially promoted lactic acid bacteria growth and acetic acid production. In vitro gas production (IVGP) in EIL was increased by 30% relative to CK and was higher than 24% in CIL. The role of expansion was more significant after ensiling, the IVGP in EIP was increased by 22% relative to CP, while that in CIP silage was only increased by 9%. Silage of fungal-treated samples reduced methane emissions by 28% to 31%. The study demonstrated that expansion provides advantages for fungal colonization and delignification, and further improves the microbial community and fermentation quality for silage, enhancing the nutrition and utilization value. This has practical application value for scaling up biological treatment and preserving the fungal-treated lignocellulose. Graphical Abstract

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhanced lignin degradation by Irpex lacteus through expanded sterilization further improved the fermentation quality and microbial community during the silage preservation process

Cao,

Cai,

Zuo

et al. 2024

Bioresour. Bioprocess.

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“…Each syringe received 30 mL of the buffered rumen fluid and was incubated at 39 • C for 96 h to obtain gas production. It was recorded manually at 0, 2,4,6,8,10,12,16,20,24,30,36,42,48,56,64,72,84, and 96 h of incubation. The kinetics of gas production were fitted using the NLIN procedure of SAS version 9.4 (SAS Institute, Cary, NC, USA), according to France et al [24].…”

Section: In Vitro Rumen Digestibilitymentioning

confidence: 99%

“…Y, gas production at time t. 3 B, theoretical gas production; B1 and B2 represent theoretical maximum gas production of the rapid and slow fermentation component. 4 c, gas production rate; c1 and c2 represent gas production rates of the rapid and slow fermentation component. 5 L, lag phase.…”

Section: In Vitro Rumen Digestibilitymentioning

confidence: 99%

Expansion Improved the Physical and Chemical Properties and In Vitro Rumen Digestibility of Buckwheat Straw

Cao,

Zuo,

Lin

et al. 2023

Animals

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The hard texture and poor palatability of straw are important factors that hinder its application in feed. Expansion is a technology that can improve the utilization of biomass, but few studies have comprehensively revealed how to change physicochemical characteristics to improve nutritional value. In this study, mechanical and chemical methods were combined to study the texture properties, rheological properties, and physicochemical structures of straw, and its utilization value was evaluated by in vitro rumen digestion. Expansion caused hemicellulose degradation, cellulose separation, and lignin redistribution, resulting in a decrease in crystallinity. The hardness and chewiness of expanded straw were reduced by 55% to 66%, significantly improving palatability. The compressive stress could be reduced by 54–73%, and the relaxation elasticity was reduced by 5% when expanded straw was compressed. The compression deformation of expanded straw was doubled compared to feedstock, and the compacting degree was improved. Expanded straw significantly improved digestibility and gas production efficiency, which was due to the pore structure increasing the attachment of rumen microorganisms; besides that, the reduction of the internal structural force of the straw reduced energy consumption during digestion. The lignin content decreased by 10%, the hardness decreased further in secondary expansion, but the digestibility did not improve significantly.

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“…Nonetheless, part of the M. sylvestris residues is formed with stems that are lignocellulosic, a part that is not easily transformed in biogas during AD. Extrusion pretreatment of the residues could alleviate this constraint by increasing the biomethane potential (BMP) [67]. To confirm the AD valorization option for mallow extraction residues, an AD test should be performed to assess the BMP and TE impact and fate on the whole AD chain.…”

Section: Other Emerging Biomass Valorization Options For M Sylvestrismentioning

confidence: 99%

Phytomanagement of a Trace Element-Contaminated Site to Produce a Natural Dye: First Screening of an Emerging Biomass Valorization Chain

et al. 2021

Self Cite

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The study of different possible biomass valorization routes is crucial in order to diversify phytomanagement options, allowing the landowner/stakeholder to choose the best option based on site characteristics and the benefits of local value chains. In the current study, field and laboratory experiments were conducted to assess the suitabilitity of Malva sylvestris L. for the phytoattenuation of a dredged sediment disposal site contaminated with trace elements (trace element (Cd, Cu, Pb, and Zn). The selected crop was Malva sylvestris, a flowering plant from which a colourant can be extracted to be used in dying of textiles as a way to valorize the produced biomass grown on this contaminated land. Under the conditions of the investigated site, the analysis of TE in the sediment and the biomass matrix showed no effect of M. sylvestris on the sediment TE contamination mobility with an excluder phenotype (Bioconcentration factor < 1). Metal concentrations were found to be the highest in the leaves followed by in the stem and flower. The dye extract obtained from the flower part of M. sylvestris permitted the silk alum-pretreated fabric to be dyed yellow, and the TE concentration in the dyed textile fabrics respected the threshold values set by OEKO-Tex standard 100.

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Techno-economic Feasibility of Extrusion as a Pretreatment Step for Biogas Production from Grass

Cited by 14 publications

References 28 publications

Enhanced lignin degradation by Irpex lacteus through expanded sterilization further improved the fermentation quality and microbial community during the silage preservation process

Enhanced lignin degradation by Irpex lacteus through expanded sterilization further improved the fermentation quality and microbial community during the silage preservation process

Expansion Improved the Physical and Chemical Properties and In Vitro Rumen Digestibility of Buckwheat Straw

Phytomanagement of a Trace Element-Contaminated Site to Produce a Natural Dye: First Screening of an Emerging Biomass Valorization Chain

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