Acidogenesis of cellulosic hydrolysates for new generation biofuels

Kandylis, Panagiotis; Bekatorou, Argyro; Pissaridi, Katerina; Lappa, Katerina; Dima, Agapi; Κουτίνας, Αθανάσιος Α.

doi:10.1016/j.biombioe.2016.05.006

Cited by 36 publications

(18 citation statements)

References 84 publications

(73 reference statements)

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“…These mainly comprise volatile fatty acids (e.g., acetate, propionate, butyrate, lactate, valerate, and caproate), alcohols, formate, H 2 , and CO 2 [54,55]. The concentration and proportion of individual Volatile Fatty Acids (VFAs) produced in the acidogenic stage are important in the overall performance of the anaerobic digestion system, since acetic and butyric acids are the preferred precursors for methane formation [56].…”

Section: Acidogenesismentioning

confidence: 99%

“…The reductive deammonification reaction also produces ammonia, VFA(s), and H 2 ; the ammonia molecules produced from these coupled reactions accept free protons, which help to control pH drop within the bioreactor [15]. Increased concentration of ammonia within the bioreactor may impede optimal functionality of the anaerobic digestion process [55].…”

Section: Acidogenesismentioning

confidence: 99%

“…The hydrogenotrophic pathway has been reported as the most metabolically efficient pathway among microorganisms; because it has the most efficient carbon fixation mechanism and thus yields the most energy [63][64][65][66]. Comparatively, reports from studies have shown that hydrogenotrophic methanogens have a better growth rate than aceticlastic methanogens, and require only 4 to 12 hours to reach double in population [55]. The impressive stability of anaerobic high rate reactors, witnessed during anaerobic digestion, even under varying conditions, is attributed to the hydrogenotrophic methanogen's high growth rate [66].…”

Section: Methanogenesismentioning

confidence: 99%

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Towards Sustainable Energy: The Requisite Role of Microorganisms in the Production of Biogas and Bioethanol

Ekwebelem

Ofielu

Dike

et al. 2020

JENRR

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Increased energy consumption coupled with the ongoing climate change are urging us to develop more sustainable energy alternatives, including biofuels produced from renewable biomass. Our heavy reliance on fossil-derived fuels has not only gained intense public attention in recent years, but has also prompted us to intensively study the production of sustainable biofuels from renewable energy sources via microbial fermentation. Owing to the recent advances and availability of state-of-the-art molecular tools, our knowledge about anaerobic microorganisms and their direct and indirect contributions in the production of different biofuels have increased tremendously. Anaerobic microorganisms are mainly utilized for commercial production of biofuels such as; biogas and fuel alcohols from renewable organic matter, while photosynthetic microorganisms convert inorganic carbon and water to potential fuels (e.g. fuel alcohols) and fuel precursors (e.g. biomass, starch, lipids). Although metabolically engineered microorganisms, programmed to redirect renewable carbon sources into desired fuel products, are contemplated as best choices to obtain high volumetric productivity and yield, however, native populations of anaerobic microorganisms are still considered the primary choice for the production of biogas and bioethanol. These anaerobic microorganisms responsible for different degradation pathways and their functions in anaerobic digesters are continuously being updated. In this review, we discuss the essential role of anaerobic microbes in biogas and bioethanol production via consolidated anaerobic process. Additionally, key enzymatic reactions and microbiota involved in the degradation steps and in the production pathways are specifically highlighted. We also discussed the challenges that still exist for biofuel production from native populations of anaerobic microorganisms and their possible solutions.

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Section: Acidogenesismentioning

confidence: 99%

Section: Acidogenesismentioning

confidence: 99%

Section: Methanogenesismentioning

confidence: 99%

See 1 more Smart Citation

Towards Sustainable Energy: The Requisite Role of Microorganisms in the Production of Biogas and Bioethanol

Ekwebelem

Ofielu

Dike

et al. 2020

JENRR

View full text Add to dashboard Cite

show abstract

“…During this phase, the monomers and soluble derivatives of organic component in the substrate are converted into short chain volatile fatty acids (VFAs), hydrogen, carbon dioxide, alcohols and acetates [25]. According to different microbial proportions, acidogenic fermentation could be classified into three different types [26]. The butyric-type fermentation produces butyric acid and acetic acid along with CO 2 and H 2.…”

Section: Technical Overviewmentioning

confidence: 99%

“…Propionic-type fermentation involves no significant CO 2 and H 2 production in the production of propionic acid, acetic acid, and valeric acid. Finally, ethanol-type fermentation has major production components of ethanol and acetic acid along with small amounts of CO 2 and H 2 [26].…”

Section: Technical Overviewmentioning

confidence: 99%

Biohydrogen production from anaerobic digestion and its potential as renewable energy

et al. 2018

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The current demand-supply scenario for fossil fuels requires an alternative energy source with cleaner combustion products whilst production of hydrogen from anaerobic digestion involves the utilization of waste materials and zero emission of greenhouse gasses. However, large scale industrial application has yet not been implemented due to numerous challenges in its production, storage, and transportation. This review study demonstrates that production of hydrogen from anaerobic digestion is potentially a worthy alternative regarding energy density, environmental impact, and cost. Moreover, dependence on fossil fuel systems in the future could be minimized when biohydrogen production is feasible from renewable energy sources.

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