Bioconversion of alkali delignified cotton stalk using two-stage dilute acid hydrolysis and fermentation of detoxified hydrolysate into ethanol

Keshav, Praveen Kumar; Naseeruddin, Shaik; Koti, Sravanthi; Linga, Venkateswar Rao

doi:10.1016/j.indcrop.2016.07.031

Cited by 67 publications

(22 citation statements)

References 39 publications

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“…The total holocellulose content (sum of cellulose and hemicellulose) of CS is 52.7% (w/w), making CS a potential feedstock for ethanol production. The total polysaccharide content of cotton stalk can be fairly compared with other extensively explored lignocellulosic materials, such as sugarcane bagasse, 67.1%; corn stover, 58.3%; wheat straw, 54.0%; and sorghum straw, 61.0%; and widely accepted switch grass, 52.9%, for ethanol production [6].…”

Section: Composition Of Native and Pretreated Csmentioning

confidence: 99%

“…Various pretreatments of CS have been reported in literature i.e., alkali pretreatment [4,6,26], high pressure-assisted alkali pretreatment and ultrasound-assisted alkali pretreatment [27,28], steam explosion [29], liquid hot water pretreatment [23], dilute acid pretreatment [27,30], pretreatment with ILs [22], ozone treatment [4]. The outcome of each pretreatment in terms of lignin and hemicellulose solubilization depends on the pretreatment method and the conditions applied.…”

Section: Composition Of Native and Pretreated Csmentioning

confidence: 99%

“…According to Food and Agricultural Organization of the United Nations cotton production in 2014 was approximately 26 million tones worldwide [5]. Cotton stalk (CS), a by-product of cotton production, generated in huge volumes annually, approximately 2 metric tons of dry matter/ha, is a major low-cost source of sugars that can be converted into bio-based products such as fuel ethanol [6].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Various Pretreatment Methods on Bioethanol Production from Cotton Stalks

et al. 2019

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Cotton stalks (CS) are considered a good candidate for fuel-ethanol production due to its abundance and high carbohydrate content, but the direct conversion without pretreatment always results in extremely low yields due to the recalcitrant nature of lignocelluloses. The present study was undertaken to investigate the effect of various chemical and physicochemical pretreatment methods, i.e., alkali, microwave-assisted acid, organosolv, hydrothermal treatment, and sequentially organosolv and hydrothermal pretreatment, on chemical composition of CS and subsequent ethanol production applying pre-hydrolysis and simultaneous saccharification and fermentation (PSSF) at high solid loading. The best results in terms of ethanol production were achieved by the sequential combination of organosolv and hydrothermal pretreatment (32.3 g/L, using 15% w/v substrate concentration and 6 h pre-hydrolysis) with an improvement of 32% to 50% in ethanol production compared to the other pretreatments. Extending pre-hydrolysis time to 14 h and increasing substrate concentration to 20% w/v, ethanol production reached 47.0 g/L (corresponding to an ethanol yield of 52%) after 30 h of fermentation.

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Section: Composition Of Native and Pretreated Csmentioning

confidence: 99%

Section: Composition Of Native and Pretreated Csmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Various Pretreatment Methods on Bioethanol Production from Cotton Stalks

et al. 2019

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“…CS contains amount of carbohydrates, like cellulose and hemicelluloses, which can be converted into a variety of usable forms of energy such as bioethanol, biohydrogen, and biogas 3 , 4 . Among all the biofuels, biogas is paid increasing attention because its production process and conditions are simpler than the production of other biofuels, which make biogas production more practical 5 .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of methane production from Cotton Stalk using different pretreatment techniques

Zhang

Khalid

et al. 2018

Sci Rep

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China produces large amount of cotton stalk (CS) residues as agricultural biomass, which are incinerated on-site, causing air pollution. The high organic content of CS could be utilized for biogas production, but the direct digestion without pretreatment always leads to a low methane yield and biodegradability, due to the complicated structure of lignocellulose. In order to search best fitting pretreatment methods in effective anaerobic digestion (AD) of CS, effects of various pretreatments including KOH, NaOH, Ca(OH)2, alkali hydrogen peroxide (AHP), H2SO4, H3PO4 and steam explosion (SE) were studied. It was seen that all treatments resulted in varying methane yields. Among all the pretreatments, acid pretreatment is not suitable for AD of CS. The results showed that the highest cumulative methane yield (CMY) of 192.4 mL·gVS−1 was obtained after 3% AHP pretreatment of CS, and the methane yield improved by 254.3% than the untreated CS. Therefore, AHP treatment was proven to be an efficient pretreatment technique. XRD and FTIR analyses had shown that pretreated CS had favorable structural changes. This research is beneficial in developing environment friendly and cost-effective pretreatment technologies to utilize CS for methane production in future application.

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“…Interestingly, commonly-used activated carbon does not allow for complete removal of fermentation inhibitors. For example, the use of a two-stage detoxification (combination of hydrolysis treatment with calcium hydroxide and activated carbon) allows to remove 78.3% of the total phenolic and furan compounds from the solution after two-stage hydrolysis with sulfuric acid [43]. The use of electrodialysis allows for the complete removal of acetic acid and more than 50% of total phenolic compounds, however, it has no significant effect on reducing the concentration of furan derivatives [44].…”

Section: Influence Of the Pre-treatment And Saccharification Conditiomentioning

confidence: 99%

Comparison and Optimization of Saccharification Conditions of Alkaline Pre-Treated Triticale Straw for Acid and Enzymatic Hydrolysis Followed by Ethanol Fermentation

et al. 2018

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This paper concerns the comparison of the efficiency of two-stage hydrolysis processes, i.e., alkaline pre-treatment and acid hydrolysis, as well as alkaline pre-treatment followed by enzymatic hydrolysis, carried out in order to obtain reducing sugars from triticale straw. For each of the analyzed systems, the optimization of the processing conditions was carried out with respect to the glucose yield. For the alkaline pre-treatment, an optimal catalyst concentration was selected for constant values of temperature and pre-treatment time. For enzymatic hydrolysis, optimal process time and concentration of the enzyme preparation were determined. For the acidic hydrolysis, performed with 85% phosphoric acid, the optimum temperature and hydrolysis time were determined. In the hydrolysates obtained after the two-stage treatment, the concentration of reducing sugars was determined using HPLC. The obtained hydrolysates were subjected to ethanol fermentation. The concentrations of fermentation inhibitors are given and their effects on the alcoholic fermentation efficiency are discussed.

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Bioconversion of alkali delignified cotton stalk using two-stage dilute acid hydrolysis and fermentation of detoxified hydrolysate into ethanol

Cited by 67 publications

References 39 publications

Effect of Various Pretreatment Methods on Bioethanol Production from Cotton Stalks

Effect of Various Pretreatment Methods on Bioethanol Production from Cotton Stalks

Enhancement of methane production from Cotton Stalk using different pretreatment techniques

Comparison and Optimization of Saccharification Conditions of Alkaline Pre-Treated Triticale Straw for Acid and Enzymatic Hydrolysis Followed by Ethanol Fermentation

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