Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery

Silva, Carlos Eduardo de Farias; Bertucco, Alberto

doi:10.1590/1678-4324-2019160816

Cited by 19 publications

(5 citation statements)

References 41 publications

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“…To expedite the high-throughput fermentation process, pre-treatment and hydrolysis of the biomass must be coupled. The fourth generation of biofuels, known as next-generation biofuels, are produced through biorefining and rely on cutting-edge technological processes like photofermentation or combined algal biomass processes using genetically modified microalgae [37]. Due to its zero-waste approach, high-throughput fermentation is a novel bioethanol production technique.…”

Section: Fermentative Valorizationmentioning

confidence: 99%

Implementation and Optimization of Algal Biomass in Value-Added Products Recovery: A Step towards Algae-Based Green Economy

et al. 2023

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Algal biomass is a prospective feedstock for the eco-sustainable production of many different products with added value, such as meals, feeds, and fuels. The remaining biomass from the algae can be used as raw material and can be transformed into useful secondary products after the important macromolecules have been removed. By optimizing algal biomass hydrolysate utilizing microbial fermentation, several studies demonstrated the generation of bioenergy (bioalcohol, biogas, and biohydrogen) and biochemicals (organic acids and biopolymers). Since the harvest and maintenance of sustainable algal cultivation incur considerable energy and economical prowess, developing products from algae remains a challenge to be countered in commercial applications. This is a typical bottleneck issue when processing algae for fuels or chemicals at the pilot scale. Implementation of integrated algae biorefinery methods can substantially reduce the cost of production and energy consumption. An algae-based green economy can be financially more viable and utilizable, especially for countries with weaker economies. This review’s goal is to examine the implementation of integrated biorefineries for the recovery of bioproducts generated from algae and potential applications. In this context, the life cycle analysis and business elements of a unified algal biorefinery are also addressed.

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Section: Fermentative Valorizationmentioning

confidence: 99%

Implementation and Optimization of Algal Biomass in Value-Added Products Recovery: A Step towards Algae-Based Green Economy

et al. 2023

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“…The agreement to increase countries' ability to deal with the impacts of climate change and mitigate greenhouse gas (GHG) emissions. Thus, the trend is to increase the participation of biofuels in the world energy matrix [1,2,3]. To contribute to this international policy, the Very High Gravity fermentation (VHG) is a technology that can contribute to the reduction of energy consumption and the generation of residues in the ethanol production process in plants [4].…”

Section: Introductionmentioning

confidence: 99%

Protective Effect of Silica on Adaptation of saccharomyces cerevisiae, Ethanol Red® for Very High Gravity Fermentation

Oliveira,

Silva,

Faria

et al. 2023

Braz. arch. biol. technol.

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The Very High Gravity (VHG) fermentation is a technology that can lead to a reduction in waste generation, a reduction in energy consumption and GHG emissions and several technical, economic, and environmental advantages. Having, as a limiting factor, yeast tolerance to the most diverse stressors in the fermentation medium. To overcome this limitation, the aim of the work was to verify the potential protective effect of silica (+A) on Saccharomyces cerevisiae (Ethanol Red ®) submitted to VHG fermentation. Initially, an adaptive test to VHG fermentation was carried out, with 5 cell recycles in musts from sugar cane syrup. Each recycle was subjected to the treatments, in quadruplicate: T1C (control) -Wort without silica supplementation; T2S100-Wort with supplementation of 100 mg L -1 of silica and T3S300-Wort with supplementation of 300 mg L -1 of silica. As a result, the T3S300 treatment in the adaptive test, showed viability of 77.5 to 81.55%; biomass production from 8.1 to 10.0 g L -1 ; yield from 90.0 to 95.3% and productivity from 7.3 to 10.9 mL L -1 h -1 . In conclusion, the treatment of the wort with silica (+A) (100 and 300 mg L -1 ) has an effect protector on yeast and may present positive responses in VHG fermentations.

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“…Biomass for power generation is gaining popularity globally due to its long-term sustainability, potential, and environmental benefits. Furthermore, the produced biomass is almost carbon neutral and has the potential to significantly reduce net carbon emissions as well as hazardous emissions (Tumuluru et al 2012); therefore, the need for sustainable and renewable energy sources has become an urgent demand (Silva et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Algal biomass valorization for biofuel production and carbon sequestration: a review

et al. 2022

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The world is experiencing an energy crisis and environmental issues due to the depletion of fossil fuels and the continuous increase in carbon dioxide concentrations. Microalgal biofuels are produced using sunlight, water, and simple salt minerals. Their high growth rate, photosynthesis, and carbon dioxide sequestration capacity make them one of the most important biorefinery platforms. Furthermore, microalgae's ability to alter their metabolism in response to environmental stresses to produce relatively high levels of high-value compounds makes them a promising alternative to fossil fuels. As a result, microalgae can significantly contribute to long-term solutions to critical global issues such as the energy crisis and climate change. The environmental benefits of algal biofuel have been demonstrated by significant reductions in carbon dioxide, nitrogen oxide, and sulfur oxide emissions. Microalgae-derived biomass has the potential to generate a wide range of commercially important high-value compounds, novel materials, and feedstock for a variety of industries, including cosmetics, food, and feed. This review evaluates the potential of using microalgal biomass to produce a variety of bioenergy carriers, including biodiesel from stored lipids, alcohols from reserved carbohydrate fermentation, and hydrogen, syngas, methane, biochar and bio-oils via anaerobic digestion, pyrolysis, and gasification. Furthermore, the potential use of microalgal biomass in carbon sequestration routes as an atmospheric carbon removal approach is being evaluated. The cost of algal biofuel production is primarily determined by culturing (77%), harvesting (12%), and lipid extraction (7.9%). As a result, the choice of microalgal species and cultivation mode (autotrophic, heterotrophic, and mixotrophic) are important factors in controlling biomass and bioenergy production, as well as fuel properties. The simultaneous production of microalgal biomass in agricultural, municipal, or industrial wastewater is a low-cost option that could significantly reduce economic and environmental costs while also providing a valuable remediation service. Microalgae have also been proposed as a viable candidate for carbon dioxide capture from the atmosphere or an industrial point source. Microalgae can sequester 1.3 kg of carbon dioxide to produce 1 kg of biomass. Using potent microalgal strains in efficient design bioreactors for carbon dioxide sequestration is thus a challenge. Microalgae can theoretically use up to 9% of light energy to capture and convert 513 tons of carbon dioxide into 280 tons of dry biomass per hectare per year in open and closed cultures. Using an integrated microalgal bio-refinery to recover high-value-added products could reduce waste and create efficient biomass processing into bioenergy. To design an efficient atmospheric carbon removal system, algal biomass cultivation should be coupled with thermochemical technologies, such as pyrolysis.

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Bioethanol from Microalgal Biomass: A Promising Approach in Biorefinery

Cited by 19 publications

References 41 publications

Implementation and Optimization of Algal Biomass in Value-Added Products Recovery: A Step towards Algae-Based Green Economy

Implementation and Optimization of Algal Biomass in Value-Added Products Recovery: A Step towards Algae-Based Green Economy

Protective Effect of Silica on Adaptation of saccharomyces cerevisiae, Ethanol Red® for Very High Gravity Fermentation

Algal biomass valorization for biofuel production and carbon sequestration: a review

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