Improved physicochemical pretreatment and enzymatic hydrolysis of rice straw for bioethanol production by yeast fermentation

Banoth, Chandrasekhar; Sunkar, Bindu; Tondamanati, Pruthvi Raj; Bhukya, Bhima

doi:10.1007/s13205-017-0980-6

Cited by 38 publications

(6 citation statements)

References 39 publications

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“…They are generally employed to overcome the problem of recalcitrance and easy separation of cellulose from biomass matrix, to make it more accessible for enzymatic hydrolysis . They mainly include steam explosion, liquid hot water, ammonia fiber explosion (AFEX), ammonia recycle percolation (ARP), and supercritical fluid pretreatment . These methods involve the use of high temperature, pressure, and some chemicals that collectively digest the polymeric components of LB and release the fermentable sugars.…”

Section: Conventional Pretreatment Methodsmentioning

confidence: 99%

New trends in application of nanotechnology for the pretreatment of lignocellulosic biomass

Ingle

Chandel

Antunes

et al. 2018

Biofuels Bioprod Bioref

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Pretreatment is an inevitable step in the bioethanol / biochemicals production process in which lignocellulosic biomass (LB) is converted to fermentable sugars. It has a large impact on process cost, constituting approximately 40% of total processing cost of bioethanol or biochemical production. Several physical, chemical, physicochemical, and biological pretreatment approaches are available but there are certain limitations to the use of all of these methods on a large scale, which mainly include high processing costs, the generation of toxic inhibitors, and the detoxification of the inhibitors generated. These limitations collectively restrict the use of the existing methods and warrants for the development of a novel, efficient, cost‐effective, and ecofriendly approach for the pretreatment of LB. In this context, nanotechnology‐based pretreatment methods, involving the use of various nanomaterials, have been proposed. The smaller size of nanomaterials makes them more efficient in penetrating the cell walls of LB and hence such nanomaterials can readily interact with the lignocellulosic components at low severity to release carbohydrates to be used for bioethanol and / or biochemical production. This review provides a brief description of various existing pretreatment methods and their advantages and disadvantages. It also presents a critical overview of the application of various nanotechnological methods in the pretreatment of different lignocellulosic substrates. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Conventional Pretreatment Methodsmentioning

confidence: 99%

New trends in application of nanotechnology for the pretreatment of lignocellulosic biomass

Ingle

Chandel

Antunes

et al. 2018

Biofuels Bioprod Bioref

View full text Add to dashboard Cite

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“…The 1st pre-treatment procedure was a hydrothermal pre-treatment (HT), where the straw was heated up to 120° for 30 min with a vapor pressure of 1.5 kg cm −2 in an autoclave while accompanied by demineralized water. A method recognized by other studies too [33]. The 2nd pretreatment was a chemical pre-treatment (CT), where the straw was submerged in tannery wastewater for 24 hours at 37 °C in 500 mL infusion bottles followed by a washing of the straw and a hydrothermal pre-treatment.…”

Section: Pre-treatment Of Biomassesmentioning

confidence: 99%

Co-Ensiling of Wheat Straw as an Alternative Pre-Treatment to Chemical, Hydrothermal and Mechanical Methods for Methane Production

et al. 2020

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Wheat straw without pre-treatment is only converted to methane to a low degree during anaerobic digestion for fuel production due to its low hydrolysis. Current pre-treatment technologies are challenged by high expenses to energy or chemical agents. We examined the low-tech co-ensiling pre-treatment as an alternative pre-treatment of wheat straw, and compared the results with hydrothermal, chemical and mechanical pre-treatment methods. The effects of co-ensiling duration and the mixing ratio between straw and sugar beet root on the methane yields, surface morphology and chemical composition were examined. It was found that co-ensiling could improve production of methane by 34.7%, while a combined hydrothermal and chemical pre-treatment could increase the production of methane by 25.4%. The study demonstrated that the effect of co-ensiling could overlap with hydrothermal and chemical pre-treatment by having similar effects to increase lignocellulosic hydrolysis and improve methane production.

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“…Among them, sodium hydroxide is reported to be more efficient and helps remove uronic and acetyl groups from hemicellulose, which helps in the digestion of hemicelluloses (Chang and Holtzapple, 2000). A combination of physicochemical pretreatment methods such as the application of steam explosion with KOH for the pretreatment of rice straw has also been studied for the substantial increase in the yield of fermentable sugars (Banoth et al, 2017). In order to assess the efficacy of various chemicals for the pretreatment of lignocellulosic biomass, the yield of fermentable sugars obtained from various biomasses is compared.…”

Section: Introductionmentioning

confidence: 99%

An Approach to Correlate Chemical Pretreatment to Digestibility Through Biomass Characterization by SEM, FTIR and XRD

Sunkar

Bhukya²

2022

Front. Energy Res.

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A comprehensive study was carried out to assess the efficiency of different chemicals on the pretreatment of plant biomass, corn cobs. The efficiency was assessed based on its effect on subsequent hydrolysis of biomass for the conversion to fermentable sugars. Both alkali- and acid-based pretreatments were carried out under optimized conditions to avoid the formation of inhibitors and also to yield more sugars. Among the different chemicals used, 2% NaOH (w/v) was found to be effective with the delignification efficiency of 84.32%, and furthermore, the biomass saccharification efficiency was found to be 86.28% using 1.20% (v/v) HNO3 at 100°C for 90 min, whereas the pretreatment with other chemicals such as KOH, NaClO2, Na2SO3, and NH3 had significantly (p < 0.05) low delignification, which ultimately reduced the saccharification efficiency. In acid–base-based pretreatment, 1.5% (v/v) HNO3 resulted in 63.42% delignification along with 68% digestion of hemicelluloses. The effect of pretreatment efficiency on digestibility was investigated by biomass characterization using SEM, FTIR, and XRD analyses before and after the treatment process. The imaging studies clearly indicated that 2% NaOH efficiently digested the complex matrix alignment and enhanced the surface area of the carbohydrate polymer which had shown a positive impact on the rate of hydrolysis. The study concludes that alkali-based pretreatment is the efficient and cost-viable technique for the effective valorization of corn cobs for the production of fermentable sugars which can be further converted to various valuable bioproducts.

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Improved physicochemical pretreatment and enzymatic hydrolysis of rice straw for bioethanol production by yeast fermentation

Cited by 38 publications

References 39 publications

New trends in application of nanotechnology for the pretreatment of lignocellulosic biomass

New trends in application of nanotechnology for the pretreatment of lignocellulosic biomass

Co-Ensiling of Wheat Straw as an Alternative Pre-Treatment to Chemical, Hydrothermal and Mechanical Methods for Methane Production

An Approach to Correlate Chemical Pretreatment to Digestibility Through Biomass Characterization by SEM, FTIR and XRD

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