Effect of combined chemical and thermal pretreatments on biogas production from lignocellulosic biomasses

Patowary, Dipam; Baruah, D.C.

doi:10.1016/j.indcrop.2018.08.055

Cited by 49 publications

(12 citation statements)

References 44 publications

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“…The contents of cellulose, hemicellulose and lignin in biomass are crucial factor for bioconversion. Generally, these compositions vary in amounts because of the difference in growth conditions and species [25]. In this study, the untreated SSS contained 37.74% cellulose, 28.07% hemicelluloses and 21.48% lignin (Table 1).…”

Section: Resultsmentioning

confidence: 97%

Pretreatment of sweet sorghum straw and its enzymatic digestion: insight into the structural changes and visualization of hydrolysis process

Dong

Wang

et al. 2019

Biotechnol Biofuels

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BackgroundThe efficient utilization of lignocellulosic biomass for biofuel production has received increasing attention. Previous studies have investigated the pretreatment process of biomass, but the detailed enzymatic hydrolysis process of pretreated biomass remains largely unclear. Thus, this study investigated the pretreatment efficiency of dilute alkali, acid, hydrogen peroxide and its ultimate effects on enzymatic hydrolysis. Furthermore, to better understand the enzymatic digestion process of alkali-pretreated sweet sorghum straw (SSS), multimodal microscopy techniques were used to visualize the enzymatic hydrolysis process.ResultAfter pretreatment with alkali, an enzymatic hydrolysis efficiency of 86.44% was obtained, which increased by 99.54% compared to the untreated straw (43.23%). The FTIR, XRD and SEM characterization revealed a sequence of microstructural changes occurring in plant cell walls after pretreatment, including the destruction of lignin–polysaccharide interactions, the increase of porosity and crystallinity, and reduction of recalcitrance. During the course of hydrolysis, the cellulase dissolved the cell walls in the same manner and the digestion firstly occurred from the middle of cell walls and then toward the cell wall corners. The CLSM coupled with fluorescent labeling demonstrated that the sclerenchyma cells and vascular bundles in natural SSS were highly lignified, which caused the nonproductive bindings of cellulase on lignin. However, the efficient delignification significantly increased the accessibility and digestibility of cellulase to biomass, thereby improving the saccharification efficiency.ConclusionThis work will be helpful in investigating the biomass pretreatment and its structural characterization. In addition, the visualization results of the enzymatic hydrolysis process of pretreated lignocellulose could be used for guidance to explore the lignocellulosic biomass processing and large-scale biofuel production.

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Section: Resultsmentioning

confidence: 97%

Pretreatment of sweet sorghum straw and its enzymatic digestion: insight into the structural changes and visualization of hydrolysis process

Dong

Wang

et al. 2019

Biotechnol Biofuels

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“…It has been reported that reductions in crystallinity index increased biogas yields [38,57]. Patowary and Baruah [49] reported decreases in the crystallinity index of rice straw from 0.97 to 0.85 and corn stalk from 0.96 to 0.87 by increasing the pretreatment severity through applying a combination of chemical and thermal pretreatments (using banana peel ash and CaOH at 60-90 • C for 2-10 h). The decreases in crystallinity index were simultaneous with increases in biogas production in all cases except that of the most severe pretreatment conditions (the highest temperature of 90 • C for the highest duration time of 10 h).…”

Section: Changes In Cellulose Crystallinitymentioning

confidence: 99%

Pretreatment of lignocelluloses for enhanced biogas production: A review on influencing mechanisms and the importance of microbial diversity

Mirmohamadsadeghi

Karimi

Azarbaijani

et al. 2021

Renewable and Sustainable Energy Reviews

159

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“…Hemicellulose and cellulose, collectively called holocellulose, are polymers of sugars which are biodegradable and can be effectively utilized to produce biogas [6,7]. The presence of lignin is a hindrance to the enzymatic hydrolysis of cellulose during the anaerobic digestion, what makes the hydrolysis of lignocellulose often becomes the rate-limiting step during process [8,9]. In fact, the major difficulty with the lignocellulosic substrate is the proper digestion of biomass during the AD due to the complex and recalcitrant nature of feedstock, which makes absolutely necessary a pretreatment step [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Taherdanak et al [17] evaluated the improvement of biomethane production from wheat submitted to pretreatment with H 2 SO 4 1% (v/v) at room temperature for 10 min followed by autoclave at 121 °C for four different time (10,30,60, and 120 min) and achieved an increase in methane yield of 8.9% after pretreatment for 60 min and 15.5% after 120 min, compared to untreated wheat. Patowary and Baruah [8] investigated the combination of chemical (banana peel ash and calcium hydroxide) and thermal treatments (60-90 °C for time intervals of 2, 6, and 10 h) of rice straw and corn stalk and reported that biogas production of rice straw and corn stalk pretreated at 90 °C for 6 h was enhanced by 62% and 66%, respectively as compared to untreated rice straw and corn stalk. Kim et al [18] assessed the effects of autoclaving (121 °C, 1.45 atm, 60 min) of rice straw after addition of 2% H 2 SO 4 and the results showed a reduction of about 20% in methane yield, indicating the inhibitory effect of the acid in the biogas production process.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Co-Digestion of Tannery Wastes and Untreated/Pretreated Oat Straw

et al. 2021

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The combination of carbon and nitrogen-rich co-substrates results in a better balance and increases the stability of the anaerobic co-digestion (AcoD) process. In this work, the AcoD process of waste from the leather industry (shavings and sludge) with waste from agriculture (oat straw) was assessed with regard to the energy (biogas production) and waste treatment efficiency (reduction of organic matter). The results indicate that the addition of untreated oat straw improved the AcoD process, increasing biogas production (25.44 mL of cumulative biogas/g of VSS added) by almost 60% when compared to the AcoD of only leather waste (16.17 mL/gVSS). Also, the effect of acid, alkaline, thermal, and the combination of these pretreatment techniques was evaluated on the lignocellulosic composition of oat straw and on methane yields. Pretreatments improved the characteristics and bioavailability of oat straw, particularly in methodologies that use alkali, with a significant increase in cellulose content accompanied by a decrease in hemicellulose and lignin content. However, the possible formation of secondary products or sterilization of important microorganisms did not reflect in a greater production of biogas: 21.06 mL/gVSS for oat straw pretreated only with HCl and 21.91 mL/gVSS for oat straw pretreated with HCl in autoclave; 5.20 mL/gVSS for oat straw pretreated with NaOH; and 3.43 mL/gVSS for oat straw pretreated with NaOH in autoclave; thermal pretreatment probably has generated toxic compounds from hemicellulose and cellulose degradation, which inhibited the AcoD process and, as consequence, virtually no biogas was produced.

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Effect of combined chemical and thermal pretreatments on biogas production from lignocellulosic biomasses

Cited by 49 publications

References 44 publications

Pretreatment of sweet sorghum straw and its enzymatic digestion: insight into the structural changes and visualization of hydrolysis process

Pretreatment of sweet sorghum straw and its enzymatic digestion: insight into the structural changes and visualization of hydrolysis process

Pretreatment of lignocelluloses for enhanced biogas production: A review on influencing mechanisms and the importance of microbial diversity

Anaerobic Co-Digestion of Tannery Wastes and Untreated/Pretreated Oat Straw

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