Methane production through anaerobic digestion: Participation and digestion characteristics of cellulose, hemicellulose and lignin

Li, Wanwu; Khalid, Habiba; Zhu, Zhe; Zhang, Ruihong; Liu, Guangqing; Chen, Chang; Thorin, Eva

doi:10.1016/j.apenergy.2018.05.055

Cited by 270 publications

(83 citation statements)

References 55 publications

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“…The cumulative gas production of cellulose and hemicellulose was 118.72% and 45.37% higher than that of RS, respectively. These results are consistent with those of Li et al [1,16] . This is because the VS of RS is lower than that of cellulose and hemicellulose, which also contain lignin.…”

Section: Resultssupporting

confidence: 94%

“…Under conditions of extreme pretreatment, when the accessibility of cellulose and hemicellulose becomes 100%, the principles of their AD are hypothesized to be comparable with that of straw and provide a basis for studying the principles of the AD of straw. Li et al [16] used cellulose, hemicellulose, and lignin as their mixtures of raw materials to study AD characteristics, and their results showed that hemicellulose is hydrolyzed more easily and acidi ed more quickly than cellulose. Therefore, the biomethane potential of cellulose was higher than that of hemicellulose.…”

Section: Introductionmentioning

confidence: 99%

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Biogas and volatile fatty acid production during anaerobic digestion of straw, cellulose, and hemicellulose with analysis of microbial communities and functions

Liu

Zuo

Peng

et al. 2020

Preprint

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Background Anaerobic digestion (AD) is a promising method for straw treatment, but the complex composition and structure of straw limit AD efficiency and methane production. The main biodegradable components of straw are cellulose and hemicellulose. Because of the different chemical structures and physicochemical properties, the performance of AD of cellulose and hemicellulose is different, thus it’s also different from that of straw. Research on the similarities and differences of AD of straw, cellulose and hemicellulose is helpful to clarify the law of anaerobic digestion of straw and provide theoretical basis for further improving the efficiency of anaerobic digestion. However, there are very few studies on AD using cellulose and hemicellulose as raw materials. Results Rice straw (RS), cellulose, and hemicellulose were used as raw materials to study biogas production performance and changes in the volatile fatty acids (VFAs). Further, microbial communities and genetic functions were analyzed separately for each material. The biogas production potential of RS, cellulose, and hemicellulose was different, with cumulative biogas production of 620.64, 412.50, and 283.75 mL/g·VS− 1, respectively. The methane content of the biogas produced from cellulose and hemicellulose was approximately 10% higher than that produced from RS after the methane content stabilized. Biogas production and the methane content of RS stabilized more quickly than that of cellulose and hemicellulose. The accumulation of VFAs occurred in the early stage of anaerobic digestion in all the three materials, and the main volatile fatty acid component of RS was acetic acid, whereas that of cellulose and hemicellulose was propionic acid. The cumulative amount of VFAs in both cellulose and hemicellulose was relatively higher than that in RS, and the accumulation time was 12 and 14 days longer, respectively. When anaerobic digestion progressed to a stable stage, Clostridium was the dominant bacterial genus in all three AD systems, and the abundance of Ruminofilibacter was higher during anaerobic digestion of RS. Genetically, AD of all the three materials proceeded mainly via aceticlastic methanogenesis, with similar functional components. Conclusion The biogas and VFAs production during AD of RS, cellulose, and hemicellulose showed marked differences. But when the AD progressed to the stable stage, there was no significant difference in microbial community and genetic function. Specifically, the biogas production potential of cellulose and hemicellulose was greater than that of RS. The accumulation of VFAs in the three AD systems occurred in the early stages. The main component of VFA that accumulated in RS was acetic acid, while the major component of VFAs accumulated in cellulose and hemicellulose digestions was propionic acid. At the stable stage, Clostridium was the dominant bacterial genus in all three AD systems. The AD of all the three materials proceeded mainly via aceticlastic methanogenesis, with similar components of gene functions.

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Section: Resultssupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Biogas and volatile fatty acid production during anaerobic digestion of straw, cellulose, and hemicellulose with analysis of microbial communities and functions

Liu

Zuo

Peng

et al. 2020

Preprint

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show abstract

“…Their conversion needs a structural more diverse community with members of various phyla (e.g., Firmicutes, Bacteroidetes, Chloroflexi, Proteobacteria, Spirochaetes, Synergistetes, Thermotogae, Cloacimonetes as well as Euryarchaeota) e.g., [18,30,38,43,[50][51][52]. Such communities are enabled to successively, complementarily and efficiently degrade most of the bioavailable/bioaccessible feedstock compounds (except the anaerobically hardly-degradable lignin [51,53]) due to a high functional and ecological diversity (broad range of metabolic pathways, generalists, specialists, redundancy, resilience, concurrence, syntrophy, co-occurrence). As chemically more complex feedstocks often feature high lignocellulose contents, pretreatment techniques are applied in order to enhance rheology, degradability and hence biogas/methane production [52,[54][55][56].…”

Section: Chemical Composition Of the Feedstocksmentioning

confidence: 99%

Process Disturbances in Agricultural Biogas Production—Causes, Mechanisms and Effects on the Biogas Microbiome: A Review

2019

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Disturbances of the anaerobic digestion process reduce the economic and environmental performance of biogas systems. A better understanding of the highly complex process is of crucial importance in order to avoid disturbances. This review defines process disturbances as significant changes in the functionality within the microbial community leading to unacceptable and severe decreases in biogas production and requiring an active counteraction to be overcome. The main types of process disturbances in agricultural biogas production are classified as unfavorable process temperatures, fluctuations in the availability of macro- and micronutrients (feedstock variability), overload of the microbial degradation potential, process-related accumulation of inhibiting metabolites such as hydrogen (H2), ammonium/ammonia (NH4+/NH3) or hydrogen sulphide (H2S) and inhibition by other organic and inorganic toxicants. Causes, mechanisms and effects on the biogas microbiome are discussed. The need for a knowledge-based microbiome management to ensure a stable and efficient production of biogas with low susceptibility to disturbances is derived and an outlook on potential future process monitoring and control by means of microbial indicators is provided.

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“…The lignin provides crosslinking between cellulose and hemicellulose (holocellulose) in biomass and its rigid structure retards decomposition of holocellulose. 25 Water lettuce having high holocellulose content (60.7 wt%) and low lignin content (11.6 wt%) makes it suitable for biogas production. A change in pH during digestion was attributed to the concentration of VFAs or ammonia.…”

Section: Resultsmentioning

confidence: 99%

Kinetic analysis of methane production from anaerobic digestion of water lettuce (Pistia stratiotesL.) with waste sludge

Madenoğlu

Falizi

Kabay

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Increasing demand on energy sources has motivated research studies on renewable energy originating from biomass. Water lettuce (Pistia stratiotes L.) as an invader lignocellulosic biomass with high crop yield can be utilized in anaerobic digestion to produce biomethane. Substrate and inoculum concentrations, and temperature are important parameters for kinetic analysis of methane production that was performed with water lettuce and waste sludge for the first time. Kinetic analysis can be used in reactor design, scale up and identification of optimum conditions. RESULTS In the present study, anaerobic digestion of water lettuce with waste sludge as inoculum was performed in a batch system. Substrate concentration [30, 40 and 50 g total solid (TS) L−1], waste sludge concentration (3.4 and 6.8 g TS L−1) were investigated at different digestion temperatures (35, 45, 55 and 65 °C). In the studied range, the highest biogas yield [321 mL g–1 volatile solid (VS) with 72.5% of methane content) was reached at substrate concentration of 30 g TS L−1 and waste sludge concentration of 6.8 g TS L−1 at 35 °C. The Cone model fitted well to the actual methane production compared to the modified Gompertz model. The effect of digestion temperature on methane production potential was described by the Ratkowsky model (R2 = 0.91) and optimum digestion temperature was found as 45 °C. Experimental methane yields were 81.5–232.7 mL methane g–1 VS which were 27.7–79.0% of theoretical maximum methane yield. Energy conversion efficiency was reached up to 78.4%. CONCLUSION The results revealed that anaerobic digestion of water lettuce with waste sludge for high methane production rate was accomplished at certain substrate and inoculum concentrations and temperature. © 2019 Society of Chemical Industry

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Methane production through anaerobic digestion: Participation and digestion characteristics of cellulose, hemicellulose and lignin

Cited by 270 publications

References 55 publications

Biogas and volatile fatty acid production during anaerobic digestion of straw, cellulose, and hemicellulose with analysis of microbial communities and functions

Biogas and volatile fatty acid production during anaerobic digestion of straw, cellulose, and hemicellulose with analysis of microbial communities and functions

Process Disturbances in Agricultural Biogas Production—Causes, Mechanisms and Effects on the Biogas Microbiome: A Review

Kinetic analysis of methane production from anaerobic digestion of water lettuce (Pistia stratiotesL.) with waste sludge

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