Improvement of gaseous energy recovery from sugarcane bagasse by dark fermentation followed by biomethanation process

Kumari, Sinu; Das, Debabrata

doi:10.1016/j.biortech.2015.07.038

Cited by 72 publications

(7 citation statements)

References 31 publications

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“…Therefore, it is possible that other factors are involved in determining saccharification efficiency. In fact, two major characteristics of cell wall—the cellulose crystalline index (CrI) and the degree of polymerization (DP) of β-1,4-glucans—have been considered essential to negatively affect biomass digestibility under various pretreatments in different species, including sugarcane [25, 26, 49, 50]. In addition, recent studies have suggested that the arabinose (Ara) substitution degree of xylans could reduce cellulose crystallinity for positively affecting biomass enzymatic digestibility under chemical pretreatments in sugarcane and other grasses [25, 51, 52].…”

Section: Discussionmentioning

confidence: 99%

Silencing of a BAHD acyltransferase in sugarcane increases biomass digestibility

Souza

Pacheco

Duarte

et al. 2019

Biotechnol Biofuels

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Background Sugarcane ( Saccharum spp.) covers vast areas of land (around 25 million ha worldwide), and its processing is already linked into infrastructure for producing bioethanol in many countries. This makes it an ideal candidate for improving composition of its residues (mostly cell walls), making them more suitable for cellulosic ethanol production. In this paper, we report an approach to improving saccharification of sugarcane straw by RNAi silencing of the recently discovered BAHD01 gene responsible for feruloylation of grass cell walls. Results We identified six BAHD genes in the sugarcane genome (Sac BAHD s) and generated five lines with substantially decreased SacBAHD01 expression. To find optimal conditions for determining saccharification of sugarcane straw, we tried multiple combinations of solvent and temperature pretreatment conditions, devising a predictive model for finding their effects on glucose release. Under optimal conditions, demonstrated by Organosolv pretreatment using 30% ethanol for 240 min, transgenic lines showed increases in saccharification efficiency of up to 24%. The three lines with improved saccharification efficiency had lower cell-wall ferulate content but unchanged monosaccharide and lignin compositions. Conclusions The silencing of SacBAHD01 gene and subsequent decrease of cell-wall ferulate contents indicate a promising novel biotechnological approach for improving the suitability of sugarcane residues for cellulosic ethanol production. In addition, the Organosolv pretreatment of the genetically modified biomass and the optimal conditions for the enzymatic hydrolysis presented here might be incorporated in the sugarcane industry for bioethanol production. Electronic supplementary material The online version of this article (10.1186/s13068-019-1450-7) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Silencing of a BAHD acyltransferase in sugarcane increases biomass digestibility

Souza

Pacheco

Duarte

et al. 2019

Biotechnol Biofuels

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“…In total, 60% of the lignin was completely removed at 0.25 N NaOH concentration (50 • C, 30 min). Alkali-pre-treated sugarcane bagasse boosted the efficiency of enzymatic hydrolysis by around 2.6 times compared to untreated bagasse [71]. On the contrary, Freitas et al used 1G sugarcane molasses as a substrate for hydrogen production in three expanded granular sludge bed (EGSB) reactors under mesophilic conditions (30 ± 1 • C) [72].…”

Section: Substratesmentioning

confidence: 99%

Critical Assessment of Hydrogen and Methane Production from 1G and 2G Sugarcane Processing Wastes Using One-Stage and Two-Stage Anaerobic Digestion

2023

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Sugarcane is a lignocellulosic crop which is used to produce sugar in sugarcane processing industries. Globally, sugarcane processing industries generate solid and liquid wastes amounting to more than 279 million tons per annum and by-products; namely, trash, bagasse, mill mud, and molasses. The valorisation of waste and by-products has recently increased and is playing a significant role in achieving policies and goals associated with circular bioeconomy and sustainable development. For the valorisation of sugarcane processing industry waste and by-products, a number of technologies are well established and in use, while other innovative technologies are still ongoing through research and development with promising futures. These by-products obtained from sugarcane processing industries can be converted into biofuels like hydrogen and methane via anaerobic digestion. Molasses belongs to the first-generation (1G) waste, while trash, bagasse, and mill mud belong to second-generation (2G) waste. Various studies have been carried out in converting both first- and second-generation sugarcane processing industry wastes into renewable energy, exploiting anaerobic digestion (AD) and dark fermentation (DF). This review emphasises the various factors affecting the AD and DF of 1G and 2G sugarcane processing industry wastes. It also critically addresses the feasibility and challenges of operating a two-stage anaerobic digestion process for hydrogen and methane production from these wastes.

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“…Sequential alkali pretreatment and AD has been widely applied for the valorization of lignocellulosic biomass, which besides promoting delignification causes the swelling of cellulose fibers, leading to a reduction in their crystallinity and degree of polymerization (Kumari and Das, 2015;Zhu et al, 2010). However, the alkaline pretreatmentaided AD approach applied to bioplastics has been much less investigated (Cazaudehore et al, 2022b;García-Depraect et al, 2021;Yasin et al, 2022).…”

Section: Alkaline Pretreatmentmentioning

confidence: 99%

Enhancement of Biogas Production Rate from Bioplastics by Alkaline Pretreatment

et al. 2022

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Improvement of gaseous energy recovery from sugarcane bagasse by dark fermentation followed by biomethanation process

Cited by 72 publications

References 31 publications

Silencing of a BAHD acyltransferase in sugarcane increases biomass digestibility

Silencing of a BAHD acyltransferase in sugarcane increases biomass digestibility

Critical Assessment of Hydrogen and Methane Production from 1G and 2G Sugarcane Processing Wastes Using One-Stage and Two-Stage Anaerobic Digestion

Enhancement of Biogas Production Rate from Bioplastics by Alkaline Pretreatment

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