Lignocellulosic ethanol production employing immobilized Saccharomyces cerevisiae in packed bed reactor

Mishra, Abhishek; Sharma, Ajay Kumar; Sharma, Sumit; Bagai, Rashmi; Mathur, Anshu S.; Gupta, Ravi P.; Tuli, Deepak K.

doi:10.1016/j.renene.2016.02.010

Cited by 38 publications

(31 citation statements)

References 22 publications

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“…The unfiltered enzymatic hydrolysate results (SSA-U and MSA-U) are comparable to previous studies where the enzymatic hydrolysate was filtered prior to fermentation. For instance, Mishra et al [ 46 ] observed an ethanol concentration of 29 g /L from filtered enzymatic hydrolysate of acid pretreated rice straw. A maximum ethanol concentration of 2.95 g /L was reported from the filtered enzymatic hydrolysate of alkali pretreated hazelnut shells [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Bioethanol production from sugarcane leaf waste: Effect of various optimized pretreatments and fermentation conditions on process kinetics

Moodley

2019

Biotechnology Reports

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Highlights Bioethanol kinetics was investigated under SSA-F, SSA-U, MSA-F and MSA-U conditions. Monod, logistic and modified Gompertz models gave R 2 > 0.97. SSA-U pretreated SLW produced 25% more bioethanol than MSA-U. No difference was observed between filtered and unfiltered enzymatic hydrolysate. SLW residue showed a suitable protein and fat content for animal feed.

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Section: Resultsmentioning

confidence: 99%

Bioethanol production from sugarcane leaf waste: Effect of various optimized pretreatments and fermentation conditions on process kinetics

Moodley

2019

Biotechnology Reports

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“…Bioethanol production is usually conducted employing free cells, where they proliferate in the media and carry out their metabolic functions. However, for this case, the specific growth rate of cells can be affected by many factors related to either product or substrate [93]. To overcome these, as well as enhance ethanol tolerance and promote a reduction of production costs, alternative strategies for bioethanol production have been studied, among which is the application of cells immobilization.…”

Section: Cells Immobilizationmentioning

confidence: 99%

Very High Gravity Bioethanol Revisited: Main Challenges and Advances

et al. 2021

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Over the last decades, the constant growth of the world-wide industry has been leading to more and more concerns with its direct impact on greenhouse gas (GHG) emissions. Resulting from that, rising efforts have been dedicated to a global transition from an oil-based industry to cleaner biotechnological processes. A specific example refers to the production of bioethanol to substitute the traditional transportation fuels. Bioethanol has been produced for decades now, mainly from energy crops, but more recently, also from lignocellulosic materials. Aiming to improve process economics, the fermentation of very high gravity (VHG) mediums has for long received considerable attention. Nowadays, with the growth of multi-waste valorization frameworks, VHG fermentation could be crucial for bioeconomy development. However, numerous obstacles remain. This work initially presents the main aspects of a VHG process, giving then special emphasis to some of the most important factors that traditionally affect the fermentation organism, such as nutrients depletion, osmotic stress, and ethanol toxicity. Afterwards, some factors that could possibly enable critical improvements in the future on VHG technologies are discussed. Special attention was given to the potential of the development of new fermentation organisms, nutritionally complete culture media, but also on alternative process conditions and configurations.

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“…Support materials such as gels (Ramakrishna & Prakasham, 1999), porous cellulose (Sakurai, et al, 2000), natural sponge (Ogbonna, et al, 2001), agarose (Nigam, et al, 1998), alginate (Grootjen, et al, 1990) and carrageenan (Norton, et al, 1995) immobilization with calcium alginate beads is one of the most widely-used immobilization techniques for bioethanol production (Duarte, et al, 2013). The immobilization of S. cerevisiae has been performed by entrapment in calcium alginate for optimization of ethanol production by varying alginic acid concentration, bead size, glucose concentration, temperature and hardening time (Mishra, et al, 2016). Non-toxic synthetic polymers such as polyvinylalcohol (Nurhayati, et al, 2014) and polyHIPE polymer (synthesized using high internal phase emulsions) (Karagoz, et al, 2009) are alternative candidates for industrial applications.…”

Section: Can Microbial Immobilization Improve Fermentation Yields In mentioning

confidence: 99%

Lignocellulosic ethanol production: Evaluation of new approaches, cell immobilization and reactor configurations

2019

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The environmentally-friendly, economically-viable production of ethanol from cellulosic biomass remains a major contemporary challenge. Much work has been done on the disruption of cellulosic biomass structure, the production of enzymes for the conversion of cellulose and hemicellulose into simple sugars that can be fermented by bacteria or yeast, and the metabolic engineering of ethanol-producing microbes. The results of these studies have enabled the transition from laboratory to industrial scale of cellulosic ethanol production. Notably, however, current processes use free microbial cells in batch reactors. This review highlights the advantages of using immobilized and co-immobilized cells together with continuous bioreactor configurations. These developments have the potential to improve both the yield and the green credentials of cellulosic ethanol production in modern industrial settings.

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Lignocellulosic ethanol production employing immobilized Saccharomyces cerevisiae in packed bed reactor

Cited by 38 publications

References 22 publications

Bioethanol production from sugarcane leaf waste: Effect of various optimized pretreatments and fermentation conditions on process kinetics

Bioethanol production from sugarcane leaf waste: Effect of various optimized pretreatments and fermentation conditions on process kinetics

Very High Gravity Bioethanol Revisited: Main Challenges and Advances

Lignocellulosic ethanol production: Evaluation of new approaches, cell immobilization and reactor configurations

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