Yield improvements in anaerobic digestion of lignocellulosic feedstocks

Hashemi, Behnam; Sarker, Shiplu; Lamb, Jacob Joseph; Lien, Kristian M.

doi:10.1016/j.jclepro.2020.125447

Cited by 75 publications

(34 citation statements)

References 217 publications

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“…Although basic hydrolysis (SCG_BH, Figure 1 E) has proven to result in terms of lignin degradation [ 10 ], its effect as a pretreatment for the AF of SCGs is still not clear. This work led to the second-best concentration of SCOAs out of the single physicochemical pretreatments, 2.21 gCOD/L, corresponding to an increase of 69%.…”

Section: Resultsmentioning

confidence: 99%

“…The focus on hydrolysis is crucial since this is the rate-limiting step due to the complexity of wastes and the presence of recalcitrant compounds. This situation often requires the introduction of a pretreatment step to improve substrate solubility and sugar availability by removing lignin and hemicelluloses, reducing the cellulose crystallinity, and increasing the surface area for posterior biological breakdown [ 10 ]. The selection of the ideal pretreatment highly depends on the substrate, and usually, physical and/or chemical technologies are employed.…”

Section: Introductionmentioning

confidence: 99%

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Enzymatic Potential of Filamentous Fungi as a Biological Pretreatment for Acidogenic Fermentation of Coffee Waste

et al. 2022

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Spent coffee grounds (SCGs) are a promising substrate that can be valorized by biotechnological processes, such as for short-chain organic acid (SCOA) production, but their complex structure implies the application of a pretreatment step to increase their biodegradability. Physicochemical pretreatments are widely studied but have multiple drawbacks. An alternative is the application of biological pretreatments that include using fungi Trametes versicolor and Paecilomyces variotii that naturally can degrade complex substrates such as SCGs. This study intended to compare acidic and basic hydrolysis and supercritical CO2 extraction with the application of these fungi. The highest concentration of SCOAs, 2.52 gCOD/L, was achieved after the acidification of SCGs pretreated with acid hydrolysis, but a very similar result, 2.44 gCOD/L, was obtained after submerged fermentation of SCGs by T. versicolor. This pretreatment also resulted in the best acidification degree, 48%, a very promising result compared to the 13% obtained with the control, untreated SCGs, highlighting the potential of biological pretreatments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enzymatic Potential of Filamentous Fungi as a Biological Pretreatment for Acidogenic Fermentation of Coffee Waste

et al. 2022

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“…In pulp mills or biorefinery plants, the size of the particle is of importance because reducing the dimensions of the wood chips facilitates the penetration of chemicals, which enhances the delignification process [11]. On the other hand, chips smaller than 0.4 mm are less convenient because their absorption of chemicals is too high [74]. In a biorefinery based on anaerobic digestion, chip sizes between 10 and 30 mm are preferred [74].…”

Section: Forest-wood Chain Organizationmentioning

confidence: 99%

“…On the other hand, chips smaller than 0.4 mm are less convenient because their absorption of chemicals is too high [74]. In a biorefinery based on anaerobic digestion, chip sizes between 10 and 30 mm are preferred [74].…”

Section: Forest-wood Chain Organizationmentioning

confidence: 99%

Basic Steps to Promote Biorefinery Value Chains in Forestry in Italy

et al. 2021

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Biorefineries are an important pillar to conduct the transition toward a circular bioeconomy. Forestry value chains produce wood biomass from harvesting and processing residues that have potential to be used in biorefineries, but currently, these residues are mostly used for energy generation. New biorefineries and new methodologies of wood fractionation allow the production of high value-added products based on carbohydrates and lignin. However, biorefineries based on lignocellulosic feedstock are still few in European countries and even less in Italy. The present study analyses the processes involved in a scenario of establishment of forest biorefineries, reviewing the main components and the actual organization of forestry value chains in Italy. The aim is to have a general vision, to identify and to focus the possibilities of the actual value chains and to fill gaps. The development of the territories is thought of in a perspective of a broader repertoire and more branched value chains than simple energy-generation end use, reviewing the tool for a feasibility study that could potentially involve lignocellulosic biorefineries also based on forest-wood industry feedstocks.

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“…In this condition, the hydrogenotrophic methanogens provide the dominant methane production pathway [25][26][27]. The typical growth rate of different functional groups varies by several factors including the type of substrate, operational condition, microbial diversity and the type of reactor [28,29]. It is generally accepted that the hydrolysis of complex substrates such as lignocellulosic materials are the rate-limiting step in AD [30].…”

Section: Figurementioning

confidence: 99%

Molecular Microbial Community Analysis as an Analysis Tool for Optimal Biogas Production

Hashemi

Lien

et al. 2021

Microorganisms

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The microbial diversity in anaerobic digestion (AD) is important because it affects process robustness. High-throughput sequencing offers high-resolution data regarding the microbial diversity and robustness of biological systems including AD; however, to understand the dynamics of microbial processes, knowing the microbial diversity is not adequate alone. Advanced meta-omic techniques have been established to determine the activity and interactions among organisms in biological processes like AD. Results of these methods can be used to identify biomarkers for AD states. This can aid a better understanding of system dynamics and be applied to producing comprehensive models for AD. The paper provides valuable knowledge regarding the possibility of integration of molecular methods in AD. Although meta-genomic methods are not suitable for on-line use due to long operating time and high costs, they provide extensive insight into the microbial phylogeny in AD. Meta-proteomics can also be explored in the demonstration projects for failure prediction. However, for these methods to be fully realised in AD, a biomarker database needs to be developed.

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Yield improvements in anaerobic digestion of lignocellulosic feedstocks

Cited by 75 publications

References 217 publications

Enzymatic Potential of Filamentous Fungi as a Biological Pretreatment for Acidogenic Fermentation of Coffee Waste

Enzymatic Potential of Filamentous Fungi as a Biological Pretreatment for Acidogenic Fermentation of Coffee Waste

Basic Steps to Promote Biorefinery Value Chains in Forestry in Italy

Molecular Microbial Community Analysis as an Analysis Tool for Optimal Biogas Production

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