Bioethanol Production From Lignocellulosic Biomass by Environment-Friendly Pretreatment Methods: A Review

Tayyab, Muhammad

doi:10.15666/aeer/1601_225249

Cited by 101 publications

(64 citation statements)

References 137 publications

(110 reference statements)

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“…Similarly, Wu and He [53] explained that Firmicutes can play a role in lignin depolymerization. Moreover, they can take part in rice straw compost [54,55], and decaying wood [56]. The phyla Verrucomicrobia and Gemmatimonadetes were highly abundant in the S-, compared to the M-and MS-amended soils in the first phase, whereas MS was most dominant, as compared to Mand S-amended soil in the second phase, respectively.…”

Section: Discussionmentioning

confidence: 99%

Effect of Sugarcane Straw and Goat Manure on Soil Nutrient Transformation and Bacterial Communities

et al. 2018

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Crop residue and animal manure as a soil amendment have been recognized as a feasible agricultural practice owing to its contribution in improving the soil fertility (SF). The primary advantages of this practice are determined by the activities of soil microorganisms. However, goat manure (M), sugarcane straw (S), and goat manure plus straw (MS) amendments influence soil bacteria, their activities, and SF in clay-loam soil remains undefinable. Therefore, this study distinguished the efficacy of M, MS, and S amendment on soil enzyme activities and the availability of nutrients, including various bacterial populations in clay-loamy soil with respect to two different phases (50 and 100 days). In order to analyze the bacterial structure and their activities, we employed high-throughput sequencing (HTS) and soil enzyme activity (SEA) tests. Soil amended with M and MS not only significantly enhanced nutrient availability, including C, P, and N, soil pH, as well as SEA for C and N cycles in both phases. Additionally, the increase in nutrient availability was greater in M-and MS-amended soils in the second phase (100 days) compared to the M-and S-amended soils in the first phase (50 days). Moreover, plant growth promoting and lignocellulose degrading bacterial genera were enhanced under M-and MS-amended soil compared to S-amended soil in both phases. Distance-based redundancy analysis (dbRDA) showed that soil pH, carbon-nitrogen ratio (C:N), and nitrates (NO 3 − )were inducing the fewest changes, while total nitrogen (TN), total carbon (TC), available nitrogen (AN), available phosphorus (AP), total phosphorus (TP), available potassium (AK), and ammonium (NH 4 + )were the main operators in terms of change in bacterial populations. In general, we observed that M and MS are better amendment sources as compared to S amendment in order to enhance the SF in the clay-loamy soil in both phases, but greater fertility was exhibited in the second phase.

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Section: Discussionmentioning

confidence: 99%

Effect of Sugarcane Straw and Goat Manure on Soil Nutrient Transformation and Bacterial Communities

et al. 2018

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“…A significant content in acetyl groups was also found, which indicates highly acetylated xylan structure. Regarding lignin, the value found denoted a relatively high lignified biomass, since a large number of lignocellulosic biomasses show lignin content values below 30% dwb [31,32]. However, other biomasses as hazelnut shell or Japanese cedar also exhibit high lignin contents between 33%-40% dwb [31].…”

Section: Characterization Of Os Biomassmentioning

confidence: 91%

“…The results are presented in Table 1. OS is an industrial residue which shows relatively high hemicellulose content (~26% dwb) and low cellulose content (~21% dwb), in comparison to other lignocellulosic biomasses, such as hardwoods or herbaceous type biomass, in which cellulose may constitute up to 1.4 fold the value of hemicelluloses, according to the data provided by Tayyab, et al [31]. Hemicelluloses are mostly composed by xylan, accounting for up to 23.4% of raw OS and thus showing a high potential for xylose extraction.…”

Section: Characterization Of Os Biomassmentioning

confidence: 99%

Biorefinery of the Olive Tree—Production of Sugars from Enzymatic Hydrolysis of Olive Stone Pretreated by Alkaline Extrusion

et al. 2020

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This work addresses for the first time the study of olive stone (OS) biomass pretreatment by reactive extrusion technology using NaOH as the chemical agent. It is considered as a first step in the biological conversion process of the carbohydrates contained in the material into bio-based products. OS is a sub-product of the olive oil extraction process that could be used in a context of a multi-feedstock and multi-product biorefinery encompassing all residues generated around the olive oil production sector. OS biomass is pretreated in a twin-screw extruder at varying temperatures—100, 125 and 150 °C and NaOH/biomass ratios of 5% and 15% (dry weight basis), in order to estimate the effectiveness of the process to favour the release of sugars by enzymatic hydrolysis. The results show that alkaline extrusion is effective in increasing the sugar release from OS biomass compared to the raw material, being necessary to apply conditions of 15% NaOH/biomass ratio and 125 °C to attain the best carbohydrate conversion rates of 55.5% for cellulose and 57.7% for xylan in relation to the maximum theoretical achievable. Under these optimal conditions, 31.57 g of total sugars are obtained from 100 g of raw OS.

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“…Microwave irradiation is a non-conventional heating method that has long been used for the pretreatment of LCB under an applied electromagnetic field. The first study of microwave irradiation pretreatment was carried out by Ooshima et al (1984) and since then this method has been retained a convenient one owing to its several advantages including easy operation, energy efficient, minimum inhibitors formation and high heating capacity in short period of time (Tayyab et al, 2018). In this method, the dielectric polarization causes molecular collisions and generates thermal energy that results in the disruption of the complex lignocellulosic structure (Aguilar-Reynosa et al, 2017).…”

Section: Microwave Assisted Size Reductionmentioning

confidence: 99%

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

et al. 2018

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Lignocellulosic biomass (LCB) is the most abundantly available bioresource amounting to about a global yield of up to 1. 3 billion tons per year. The hydrolysis of LCB results in the release of various reducing sugars which are highly valued in the production of biofuels such as bioethanol and biogas, various organic acids, phenols, and aldehydes. The majority of LCB is composed of biological polymers such as cellulose, hemicellulose, and lignin, which are strongly associated with each other by covalent and hydrogen bonds thus forming a highly recalcitrant structure. The presence of lignin renders the bio-polymeric structure highly resistant to solubilization thereby inhibiting the hydrolysis of cellulose and hemicellulose which presents a significant challenge for the isolation of the respective bio-polymeric components. This has led to extensive research in the development of various pretreatment techniques utilizing various physical, chemical, physicochemical, and biological approaches which are specifically tailored toward the source biomaterial and its application. The objective of this review is to discuss the various pretreatment strategies currently in use and provide an overview of their utilization for the isolation of high-value bio-polymeric components. The article further discusses the advantages and disadvantages of the various pretreatment methodologies as well as addresses the role of various key factors that are likely to have a significant impact on the pretreatment and digestibility of LCB.

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Bioethanol Production From Lignocellulosic Biomass by Environment-Friendly Pretreatment Methods: A Review

Cited by 101 publications

References 137 publications

Effect of Sugarcane Straw and Goat Manure on Soil Nutrient Transformation and Bacterial Communities

Effect of Sugarcane Straw and Goat Manure on Soil Nutrient Transformation and Bacterial Communities

Biorefinery of the Olive Tree—Production of Sugars from Enzymatic Hydrolysis of Olive Stone Pretreated by Alkaline Extrusion

Recent Trends in the Pretreatment of Lignocellulosic Biomass for Value-Added Products

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