Perspectives on microbial community in anaerobic digestion with emphasis on environmental parameters: A systematic review

Pasalari, Hasan; Gholami, Mitra; Rezaee, Abbas; Esrafili, Ali; Farzadkia, Mahdi

doi:10.1016/j.chemosphere.2020.128618

Cited by 107 publications

(27 citation statements)

References 86 publications

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“…Firmicutes is a class of gram-positive bacteria and one of the largest families in the domain bacteria. Most Firmicutes bacterial walls contain high levels of peptidoglycans (50%-80%) and are thick enough to form spores, resulting in them being highly resistant to dehydration or extreme environments 43 . Besides, several studies have shown that a large number of Firmicutes in the gut are associated with obesity 44 – 46 .…”

Section: Discussionmentioning

confidence: 99%

The effects of combined environmental factors on the intestinal flora of mice based on ground simulation experiments

Sun

Yang

Wang

et al. 2021

Sci Rep

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The composition and function of intestinal microbial communities are important for human health. However, these intestinal floras are sensitive to changes in the environment. Adverse changes to intestinal flora can affect the health of astronauts, resulting in difficulties in implementing space missions. We randomly divided mice into three groups and placed each group in either a normal environment, simulated microgravity environment or a combined effects environment, which included simulated microgravity, low pressure and noise. Fecal samples of the mice were collected for follow-up analysis based on metagenomics technology. With the influence of different space environmental factors, the species composition at the phylum and genus levels were significantly affected by the combined effects environment, especially the abundance of the Firmicutes and Bacteroidetes. Furthermore, screening was conducted to identify biomarkers that could be regarded as environmental markers. And there have also been some noticeable changes in the function of intestinal floras. Moreover, the abundance of antibiotic resistance genes (ARGs) was also found to be changed under different environmental conditions, such as bacitracin and vancomycin. The combined effects environment could significantly affect the species composition, function, and the expression of ARGs of intestinal flora of mice which may provide a theoretical basis for space medical supervision and healthcare.

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Section: Discussionmentioning

confidence: 99%

The effects of combined environmental factors on the intestinal flora of mice based on ground simulation experiments

Sun

Yang

Wang

et al. 2021

Sci Rep

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“…Finally, as terminal functional microorganisms in the AD, methanogens are responsible for producing biogas. An effective and optimal performance of AD is highly depending on healthy metabolic cooperation between microorganisms participating in the bio methanation of organic matter (Pasalari et al, 2020).…”

Section: Fundamental Of Anaerobic Digestion Process In Producing Methane Gasmentioning

confidence: 99%

“…Fermentative bacteria that involved during hydrolysis stages are Firmicutes, Bacteroidetes, Fibrobacter, Spirochaetes, and Thermotogae . Those bacteria will involve during the fermentative and metabolised processes during hydrolysis stages by the action of its various hydrolytic enzymes to breakdown the macromolecular organic structure into simpler soluble monomers such as sugar, amino acids and long chain fatty acids (LFAs) (Pasalari et al, 2020).…”

Section: Microbial Community In Hydrolysis Stagementioning

confidence: 99%

“…The most common acidogenic bacteria in the acidogenic phase are Firmicutes, Bacteroidetes, Proteobacteria and Actinobacteria (Pasalari et al, 2020;Ur Rehman et al, 2019). These bacteria secrete lytic enzymes to degrade organic matter and because of their spores, they are able to live in harsh conditions and habitats.…”

Section: Microbial Community In Acidogenesis Stagementioning

confidence: 99%

“…These bacteria secrete lytic enzymes to degrade organic matter and because of their spores, they are able to live in harsh conditions and habitats. Certain fermentation-phase products, including acetic acids, H 2 and CO 2 , may be specifically used by methanogens for the production of biogas (Pasalari et al, 2020).…”

Section: Microbial Community In Acidogenesis Stagementioning

confidence: 99%

See 2 more Smart Citations

Review on landfill gas formation from leachate biodegradation

Japperi

Asri

Bakar

et al. 2021

MJCET

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Landfill waste management is a very crucial procedure in handling Municipal Solid Waste (MSW) because it may create significant environmental issues if it is not managed properly. Landfill leachate and landfill gas (LFG) is part of the landfill waste management which triggered lot of researchers especially in terms of the environmental implications associated with the movement of the gasses during the waste constituents’ processes. Hence, this paper review is aiming to understand the behaviour of leachate itself as a decomposition agent in producing landfill gas (biogas). Biogas is naturally produced by anaerobic bacteria through anaerobic digestion which is affected by operating parameters and substrate characteristic. The results indicate that temperature, pH, and C/N ratio of leachate are the important factors that could increase the production of biogas with high content of methane. Furthermore, in terms of microbial activity during anaerobic digestion process, hydrogenotrophic and acetoclastic methanogen are the dominant substrate that contribute in producing methane gas as the final product. Firmicutes and Bacteroidetes are the common fermentative bacteria that had been found during fermentation process in hydrolysis and acidogenic phases. While, methanobacterial, methanococcal, methanomicrobial, methanosarcinal, and methanopyral are being classified as orders among 65 types of methanogenic archaea during methanogenesis stage. Overall, the relationships between operating parameters and microbial structure are important aspects that need to be considered in order to optimize the production of methane gas.

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Enhancement of anaerobic digestion of dairy wastewater by addition of conductive materials with or without the combination of external voltage application

Fountoulakis,

Frkova,

Lemaigre

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDThe addition of conductive materials or the application of external voltage is a promising novel methodology to enhance methane production in anaerobic digesters. However, there is limited knowledge about their individual or combined effects on the anaerobic digestion of dairy wastewater. The aim of this study was to examine the effects of granular activated carbon (GAC) or magnetite addition and external voltage application, both individually and in combination, for the anaerobic digestion of real, undiluted dairy wastewater.RESULTSThe results showed that the estimated maximum methane production rate increased significantly (P < 0.05) from 143 ± 8 mL gVSadded−1 day−1 in the control reactors to 163 ± 11 mL gVSadded−1 day−1 and 166 ± 11 mL gVSadded−1 day−1 in the reactors containing GAC, with or without the combination of external voltage, respectively. The addition of GAC, in both cases, resulted in higher consumption rate of acetate, indicating a promotion of the methanogenesis step. By contrast, the application of external voltage or the addition of magnetite had no significant effect on either methane production rate nor methane yield. Moreover, the analysis of the microbial community showed that the addition of GAC resulted in the enrichment of Desulfobacterota, Methanosarcina, Candidatus Methanofastidiosum and Methanolinea.CONCLUSIONOverall, GAC addition seems a promising strategy to increase methane production in anaerobic digesters treating dairy wastewater. © 2024 The Author(s). Journal of Chemical Technology and Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry (SCI).

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Perspectives on microbial community in anaerobic digestion with emphasis on environmental parameters: A systematic review

Cited by 107 publications

References 86 publications

The effects of combined environmental factors on the intestinal flora of mice based on ground simulation experiments

The effects of combined environmental factors on the intestinal flora of mice based on ground simulation experiments

Review on landfill gas formation from leachate biodegradation

Enhancement of anaerobic digestion of dairy wastewater by addition of conductive materials with or without the combination of external voltage application

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