A review on enhanced biogas production from anaerobic digestion of lignocellulosic biomass by different enhancement techniques

Kainthola, Jyoti; Kalamdhad, Ajay S.; Goud, Vaibhav V.

doi:10.1016/j.procbio.2019.05.023

Cited by 208 publications

(83 citation statements)

References 93 publications

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“…during anaerobic digestion (15 days). The CH 4 concentration is in line with values reported by previous studies of the contents of biogas, ranging from 50% to 65% (v/v) for CH 4 and from 35% to 50% (v/v) for CO 2 during sludge anaerobic digestion [33]. The production of CH 4 indicated the presence of methanogens, and the anaerobic digestion was effective.…”

Section: Figuresupporting

confidence: 89%

“…The decomposition of materials with high carbon content, greater than 35:1, occurs more slowly, because the multiplication and development of bacteria are low, due to the lack of nitrogen, but the biogas production period is longer. On the other hand, with a C:N ratio less than 8:1, bacterial activity is inhibited due to the formation of an excessive ammonium content, which in large quantities is toxic and inhibits the process [4].…”

Section: Resultsmentioning

confidence: 99%

“…Propionate and butyrate are products of acidogenesis/fermentation. The fourth stage is methanogenesis, where microorganisms produce methane through the acetoclastic and hydrogenotrophic pathways [4].…”

Section: Introductionmentioning

confidence: 99%

“…The specific pretreatment needed to improve anaerobic digestion depends on the type of organic matter. In the case of lignocellulosic material, a large part of its composition is carbohydrates that are not readily available because they are embedded in a lignin matrix, so pretreatment is necessary before the digestion process [2,4,10]. Organosolv pretreatment is an economic and efficient method to improve the anaerobic digestion process [11].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of Anaerobic Digestion of Hydrolysed Corncob Waste by Organosolv Pretreatment for Biogas Production

et al. 2020

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This paper describes an organosolv pretreatment of corncob waste to improve its anaerobic digestion for biogas production. Through a thermochemical process based on the use of ethanol and acetic acid, it was possible to separate the fractions of lignin, considered to be a natural inhibitor of anaerobic digestion processes. In addition, with this organosolv pretreatment, the available sugars in the carbohydrates present as monosaccharides, or simple sugars, were depolymerised, facilitating the digestion process. The obtained results include the chemical characterisation of the corncob, the hydrolysate, and the mixture with cow manure, finding that these substrates have potential to be used in anaerobic digestion. The total reducing sugars consumed were 96.8%, and total sugars were 85.75%. It was clearly observed that with the use of pretreatment with organosolv, the production of biogas was superior, because 484 NmL/gVS was obtained compared to the other reported treatments. It was also observed that adding the hydrolysate organosolv increased the production because the values of the control without hydrolysate were 120 NmL/gVS in the bottle experiment. When the experiment was scaled to the 5L reactor, the total volumes of biogas that were accumulated in 15 days of production were 5050 NmL/gVS and 1212 NmL/gVS with and without hydrolysate, respectively. This indicates that the organosolv pretreatment of corncob waste is effective in improving biogas production.

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Section: Figuresupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improvement of Anaerobic Digestion of Hydrolysed Corncob Waste by Organosolv Pretreatment for Biogas Production

et al. 2020

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“…Alternatively, agricultural feedstock can be used as feed for promoting the anaerobic digestion of methanogenic bacteria [142]. Pretreatment of lignocellulosic biomass with CWLEs results in a higher biogas production yield by methanogenic bacteria, thus pointing to the increasing market of different enzyme-based products with cellulolytic activities.…”

Section: Use Of Cwles For the Production Of Biofuels From Agriculturamentioning

confidence: 99%

Green Production and Biotechnological Applications of Cell Wall Lytic Enzymes

et al. 2019

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Energy demand is constantly growing, and, nowadays, fossil fuels still play a dominant role in global energy production, despite their negative effects on air pollution and the emission of greenhouse gases, which are the main contributors to global warming. An alternative clean source of energy is represented by the lignocellulose fraction of plant cell walls, the most abundant carbon source on Earth. To obtain biofuels, lignocellulose must be efficiently converted into fermentable sugars. In this regard, the exploitation of cell wall lytic enzymes (CWLEs) produced by lignocellulolytic fungi and bacteria may be considered as an eco-friendly alternative. These organisms evolved to produce a variety of highly specific CWLEs, even if in low amounts. For an industrial use, both the identification of novel CWLEs and the optimization of sustainable CWLE-expressing biofactories are crucial. In this review, we focus on recently reported advances in the heterologous expression of CWLEs from microbial and plant expression systems as well as some of their industrial applications, including the production of biofuels from agricultural feedstock and of value-added compounds from waste materials. Moreover, since heterologous expression of CWLEs may be toxic to plant hosts, genetic strategies aimed in converting such a deleterious effect into a beneficial trait are discussed.

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