Effect of hydrothermal pretreatment on two-stage anaerobic digestion of food waste and Enteromorpha: Digestion performance, bioenergy efficiency, and microbial community dynamics

Yu-fang, Wei; Gao, Jun; Shi, Zhengui; Li, Xiujin; Ma, Wenchao; Yuan, Hairong

doi:10.1016/j.fuel.2022.123639

Cited by 23 publications

(3 citation statements)

References 46 publications

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“…Pre-treated common reed at 120℃ for 2 hours increased the methane yield by 28.8% and improved the volatile solid content by 15% (Vakalis et al, 2022). Also, the performance of biogas yield in a two-stage anaerobic digester improved with the application of pretreatment at 140℃ for 2 minutes (Wei et al, 2022). The pretreatment at 140℃ enriched Acetolactic methanogens during the methanogenic bacteria responsible for enhancing methane content.…”

Section: Biogas Production Using Scw Pretreatmentmentioning

confidence: 94%

Subcritical Water Pretreatment for Anaerobic Digestion Enhancement: A Review

Hamzah¹,

Hamzah²,

Man³

et al. 2023

JST

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This work reviews hydrothermal subcritical water pretreatment to enhance biogas production through anaerobic digestion. The complexity of the lignocellulosic structure has been the main limitation contributing to unsatisfactory biogas production throughout the anaerobic digestion. The high resistance of the structure to biological hydrolysis has increased the interest in applying pretreatment prior to anaerobic digestion to facilitate hydrolysis. Hydrothermal subcritical water technology, an environmentally friendly pretreatment that uses water as the main medium, is gaining prominence in biogas enhancement. However, the subcritical water pretreatment influence on structural properties, biogas production, and the production of anaerobic process inhibitors signifies a knowledge gap and needs an evaluation. This review presents the need for pretreatment reaction and properties in the subcritical water region, biogas production from subcritical water pre-treated waste, production of inhibitors, and its challenges are discussed. This pretreatment could be a promising option and further enhance biogas production throughout the anaerobic digestion process.

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Section: Biogas Production Using Scw Pretreatmentmentioning

confidence: 94%

Subcritical Water Pretreatment for Anaerobic Digestion Enhancement: A Review

Hamzah¹,

Hamzah²,

Man³

et al. 2023

JST

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“…For biogas production using macroalgae and co-substrates, single- or two-stage bioreactors are usually used [ 14 , 15 ]. A two-stage bioreactor can produce about 30% more energy than a single-stage bioreactor [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor

Vasiliauskienė,

Pranskevičius,

Dauknys

et al. 2024

Microorganisms

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The use of microalgae as a raw material for biogas production is promising. Macroalgae were mixed with cattle manure, wheat straw, and an inoculant from sewage sludge. Mixing macroalgae with co-substrates increased biogas and methane yield. The research was carried out using a three-stage bioreactor. During biogas production, the dynamics of the composition of the microbiota in the anaerobic chamber of the bioreactor was evaluated. The microbiota composition at different organic load rates (OLRs) of the bioreactor was evaluated. This study also demonstrated that in a three-stage bioreactor, a higher yield of methane in biogas was obtained compared to a single-stage bioreactor. It was found that the most active functional pathway of methane biosynthesis is PWY-6969, which proceeds via the TCA cycle V (2-oxoglutarate synthase). Microbiota composition and methane yield depended on added volatile solids (VSadded). During the research, it was found that after reducing the ORL from 2.44 to 1.09 kg VS/d, the methane yield increased from 175.2 L CH4/kg VSadded to 323.5 L CH4/kg VSadded.

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“…For this reason, research on the interaction between the temporal trajectories of microbial community structure and operational parameters is systematically carried out in numerous research centres all over the world. The implementation of high-throughput sequencing techniques in AD research significantly increased our knowledge of the functioning of microbial communities [ 15 , 16 ]. Amplicon sequencing made it possible to identify Actinobacteria, Bacteroidetes, Chloroflexi, Firmicutes and Proteobacteria as dominant bacterial phyla and helped reveal several acetoclastic and hydrogenotrophic methanogens.…”

Section: Introductionmentioning

confidence: 99%

Quantitative and Qualitative Changes in the Genetic Diversity of Bacterial Communities in Anaerobic Bioreactors with the Diatomaceous Earth/Peat Cell Carrier

Pilarska

Wolna-Maruwka

Niewiadomska

et al. 2022

Cells

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This paper analyses the impact of the diatomaceous earth/peat (DEP; 3:1) microbial carrier on changes in the bacterial microbiome and the development of biofilm in the anaerobic digestion (AD) of confectionery waste, combined with digested sewage sludge as inoculum. The physicochemical properties of the carrier material are presented, with particular focus on its morphological and dispersion characteristics, as well as adsorption and thermal properties. In this respect, the DEP system was found to be a suitable carrier for both mesophilic and thermophilic AD. The evaluation of quantitative and qualitative changes in the genetic diversity of bacterial communities, carried out using next-generation sequencing (NGS), showed that the material has a modifying effect on the bacterial microbiome. While Actinobacteria was the most abundant cluster in the WF-control sample (WF—waste wafers), Firmicutes was the dominant cluster in the digested samples without the carrier (WF-dig.; dig.—digested) and with the carrier (WF + DEP). The same was true for the count of Proteobacteria, which decreased twofold during biodegradation in favor of Synergistetes. The Syntrophomonas cluster was identified as the most abundant genus in the two samples, particularly in WF + DEP. This information was supplemented by observations of morphological features of microorganisms carried out using fluorescence microscopy. The biodegradation process itself had a significant impact on changes in the microbiome of samples taken from anaerobic bioreactors, reducing its biodiversity. As demonstrated by the results of this innovative method, namely the BioFlux microfluidic flow system, the decrease in the number of taxa in the digested samples and the addition of DEP contributed to the microbial adhesion in the microfluidic system and the formation of a stable biofilm.

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Effect of hydrothermal pretreatment on two-stage anaerobic digestion of food waste and Enteromorpha: Digestion performance, bioenergy efficiency, and microbial community dynamics

Cited by 23 publications

References 46 publications

Subcritical Water Pretreatment for Anaerobic Digestion Enhancement: A Review

Subcritical Water Pretreatment for Anaerobic Digestion Enhancement: A Review

Changes in Microbiota Composition during the Anaerobic Digestion of Macroalgae in a Three-Stage Bioreactor

Quantitative and Qualitative Changes in the Genetic Diversity of Bacterial Communities in Anaerobic Bioreactors with the Diatomaceous Earth/Peat Cell Carrier

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