Enzymatic hydrolysis of microalgal cellulose for bioethanol production, modeling and sensitivity analysis

Shokrkar, Hanieh; Ebrahimi, Sirous; Zamani, Mehdi

doi:10.1016/j.fuel.2018.04.143

Cited by 55 publications

(12 citation statements)

References 35 publications

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“…As observed from the data, the production of ethanol from banana peels favoured acidic condition in order to obtain a higher yield of ethanol. Similar trends in the results from this study were also observed in other bio-ethanol studies, such as [14] which recorded highest glucose yield from hydrolysis at acidic pH of 4.8, also in [15],which recorded 57% of glucose yield at pH of 5, and [7], in which this study observed highest glucose concentration when using acid pre-treatment. High glucose concentration and yield from hydrolysis will also give high concentration of bio-ethanol during the fermentation process.…”

Section: Resultssupporting

confidence: 91%

“…However, limited researches haven been conducted on effect of pH on the bio-ethanol production from banana peels. Similar research of pH effect has been conducted by [14] and [15], where these researches have focused on optimizing pH value for maximum bio-ethanol production from hydrolysis of microalgae. Hence, this study was carried out to determine the effect of pH on the banana peel-derived bio-ethanol production via hydrolysis and fermentation.…”

Section: Fig 2 Steps Involved In Conversion Of Banana Peels To Bio-mentioning

confidence: 83%

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Production of Biofuel (Bio-Ethanol) From Fruitwaste: Banana Peels

Hamzah¹,

Alias²,

Ahmad³

2019

IJEAT

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Bio-ethanol, a type of biofuel, is known as renewable energy source as it is derived from biomass as its raw material. Biomass can be found in abundance and sustainable i.e. sources are available continuously, unlike the currently used conventional fossil fuels where these sources are limited and depleting. In this study, biomass from fruit waste, banana peels, were utilized to produce bio-ethanol via hydrolysis and fermentation process. Banana peels, a lignocellulosic biomass, possesses compositions which favour these processes, where the banana peels are rich in cellulose content and low in lignin content. Mechanical pre-treatment of the banana peels was conducted to further ease the hydrolysis process by reducing the particle size of the biomass. Hydrolysis was carried out for 24 hours at 50ºC at different pH using sulfuric acid H2SO4 acid and sodium hydroxide NaOH as the base, to study the effect of pH on the hydrolysis process and hence the final bio-ethanol production, in terms of concentration. Fermentation of the hydrolysis products were carried out using glucose-yeast broth for 4 days at temperature of 35ºC. Water content in the bio-ethanol product from fermentation process was separated using rotary evaporator, prior to ethanol analysis using Gas Chromatography (GC-MS). Concentration of ethanol was found to be the highest at acidic pH conditions; pH 4 to 6. Lowest ethanol concentration was recorded at higher pH values, indicating alkaline conditions do not favour the hydrolysis process.

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Section: Resultssupporting

confidence: 91%

Section: Fig 2 Steps Involved In Conversion Of Banana Peels To Bio-mentioning

confidence: 83%

Production of Biofuel (Bio-Ethanol) From Fruitwaste: Banana Peels

Hamzah¹,

Alias²,

Ahmad³

2019

IJEAT

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“…The sensitivity function of the model parameter can be represented as:

δ_{C_{Et}, normalβ} = \frac{β}{{normalC}_{normalEt}} . \frac{normal∂ C_{Et}}{normal∂ normalβ}

where C Et is ethanol concentration and β is model parameter …”

Section: Resultsmentioning

confidence: 99%

Model‐based evaluation of continuous bioethanol production plant

Shokrkar

Abbasabadi

Ebrahimi

2018

Biofuels Bioprod Bioref

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In this study, a mathematical model has been developed to evaluate the performance of industrial‐scale bioethanol production from molasses by Saccharomyces cerevisiae in a series of bioreactors operated in continuous mode. The model was based on three simple metabolic pathways in the yeast including molasses fermentation, molasses oxidation, and ethanol oxidation. The model parameters were estimated using the AQUASIM software by minimizing the error between measurements and calculated results. Results show that the model predictions agree well with the experimental results. The model is a useful tool to predict volumes, levels, discharge flow, bioethanol, and biomass concentrations in each bioreactor during the process. As it is not practical to make changes in steady‐state continuous operation processes, the model can also be used to optimize the process performance and to increase the biomass and ethanol yields. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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“…Green algae accumulate high levels of polysaccharides both as cell-wall constituents and storage molecules that can be fermented to bioethanol [ 51 , 52 ]. Oil fraction of algal biomass, which range from 20 to 60% DW depending on the species and growth conditions [ 19 , 53 ], is processed by transesterification to produce biodiesel.…”

Section: Main Textmentioning

confidence: 99%

Biomass from microalgae: the potential of domestication towards sustainable biofactories

et al. 2018

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Interest in bulk biomass from microalgae, for the extraction of high-value nutraceuticals, bio-products, animal feed and as a source of renewable fuels, is high. Advantages of microalgal vs. plant biomass production include higher yield, use of non-arable land, recovery of nutrients from wastewater, efficient carbon capture and faster development of new domesticated strains. Moreover, adaptation to a wide range of environmental conditions evolved a great genetic diversity within this polyphyletic group, making microalgae a rich source of interesting and useful metabolites. Microalgae have the potential to satisfy many global demands; however, realization of this potential requires a decrease of the current production costs. Average productivity of the most common industrial strains is far lower than maximal theoretical estimations, suggesting that identification of factors limiting biomass yield and removing bottlenecks are pivotal in domestication strategies aimed to make algal-derived bio-products profitable on the industrial scale. In particular, the light-to-biomass conversion efficiency represents a major constraint to finally fill the gap between theoretical and industrial productivity. In this respect, recent results suggest that significant yield enhancement is feasible. Full realization of this potential requires further advances in cultivation techniques, together with genetic manipulation of both algal physiology and metabolic networks, to maximize the efficiency with which solar energy is converted into biomass and bio-products. In this review, we draft the molecular events of photosynthesis which regulate the conversion of light into biomass, and discuss how these can be targeted to enhance productivity through mutagenesis, strain selection or genetic engineering. We outline major successes reached, and promising strategies to achieving significant contributions to future microalgae-based biotechnology.

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Enzymatic hydrolysis of microalgal cellulose for bioethanol production, modeling and sensitivity analysis

Cited by 55 publications

References 35 publications

Production of Biofuel (Bio-Ethanol) From Fruitwaste: Banana Peels

Production of Biofuel (Bio-Ethanol) From Fruitwaste: Banana Peels

Model‐based evaluation of continuous bioethanol production plant

Biomass from microalgae: the potential of domestication towards sustainable biofactories

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