Holistic exploitation of pulsed electric field (PEF)-treated and lipid extracted microalgae Auxenochlorella protothecoides, utilizing anaerobic digestion (AD)

Straessner, R.; Nikolausz, Marcell; Silve, Aude; Nazarova, N. I.; Wuestner, R.; Papachristou, Ioannis; Akaberi, Sahar; Leber, K.; Mueller, Georg; Frey, Wolfgang

doi:10.1016/j.algal.2022.102950

Cited by 4 publications

(3 citation statements)

References 75 publications

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“…Note that the energy analysis currently omits certain requirements such as pumping, transesterification, purification, and treatment of the rest water/biomass etc. However, the energy that can be recovered from the rest biomass using, i.e., anaerobic digestion 47 is also not considered.…”

Section: Discussionmentioning

confidence: 99%

Excess of Water Enables Efficient Lipid Extraction from Wet Pulsed-Electric Field-Treated A. protothecoides Microalgae Using Immiscible Solvents

Silve,

Nazarova,

Wüstner

et al. 2024

ACS Sustainable Chem. Eng.

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This article presents a new processing approach to perform lipid extraction on the wet microalgae A. protothecoides using nonpolar solvents or solvents of low polarity. It was demonstrated that solvents such as hexane, heptane, or 2-butanol exhibit a negligible extraction efficiency (<4% of total lipid content) when added to the pulsed-electric field (PEF)-treated and dewatered biomass slurry. In contrast, extraction efficiency after PEF treatment could substantially be increased by adding water and solvent to the biomass slurry. For this case, additional water admixture during extraction enabled to recover 67.3, 62, or 82.3% of the total lipid content, respectively. When utilizing methyl terbutyl ether (MTBE), ethylacetate, and 2-methyltetrahydrofuran (2-MeTHF) as extracting solvents, the yield increase by additional water admixture is far less pronounced. In all cases, the extraction process was performed after a PEF treatment using 1.50 MJ/kgDW plus 24-h incubation and 20 h of mixing time with the solvents and the solvent/water mixtures. Estimations on the energy required for the whole downstream process showed that this process variant allows an energy consumption of 31.48 MJ/kgbiodiesel at maximum and 7.98 MJ/kgbiodiesel at minimum. The low energy requirements (only <22% of the energy content of the lipids) open pathways to energetical applications of microalgae lipids.

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Section: Discussionmentioning

confidence: 99%

Excess of Water Enables Efficient Lipid Extraction from Wet Pulsed-Electric Field-Treated A. protothecoides Microalgae Using Immiscible Solvents

Silve,

Nazarova,

Wüstner

et al. 2024

ACS Sustainable Chem. Eng.

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“…A 51% higher biomethane was produced when Acutodesmus obliquus was pretreated with glass beads [85]. Recently, Straessner et al [86] used pulsed electric field (PEF) for the first time as a pretreatment technology to improve biomethane yield from Auxenochlorella protothecoides. PEF is a wellestablished technology commonly used for extracting molecules from microalgae biomass.…”

Section: Pretreatment Technologiesmentioning

confidence: 99%

From Microalgae to Bioenergy: Recent Advances in Biochemical Conversion Processes

et al. 2023

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Concerns about rising energy demand, fossil fuel depletion, and global warming have increased interest in developing and utilizing alternate renewable energy sources. Among the available renewable resources, microalgae biomass, a third-generation feedstock, is promising for energy production due to its rich biochemical composition, metabolic elasticity, and ability to produce numerous bioenergy products, including biomethane, biohydrogen, and bioethanol. However, the true potential of microalgae biomass in the future bioenergy economy is yet to be realized. This review provides a comprehensive overview of various biochemical conversion processes (anaerobic digestion, direct biophotolysis, indirect biophotolysis, photo fermentation, dark fermentation, microalgae-catalyzed photo fermentation, microalgae-catalyzed dark fermentation, and traditional alcoholic fermentation by ethanologenic microorganisms) that could be adapted to transform microalgae biomass into different bioenergy products. Recent advances in biochemical conversion processes are compiled and critically analyzed, and their limitations in terms of process viability, efficacy, scalability, and economic and environmental sustainability are highlighted. Based on the current research stage and technological development, biomethane production from anaerobic digestion and bioethanol production from traditional fermentation are identified as promising methods for the future commercialization of microalgae-based bioenergy. However, significant challenges to these technologies’ commercialization remain, including the high microalgae production costs and low energy recovery efficiency. Future research should focus on reducing microalgae production costs, developing an integrated biorefinery approach, and effectively utilizing artificial intelligence tools for process optimization and scale-up to solve the current challenges and accelerate the development of microalgae-based bioenergy.

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“…En la actualidad, diversos métodos han sido desarrollados al extraer lípidos de microalgas con la finalidad de aprovechar el perfil único de ácidos grasos que incluyen saturados e insaturados, los cuales poseen un potencial como materia prima para una variedad de productos, aplicaciones alimentarias, cosméticas y fuente de energía: biometano, biodiesel e incluso combustibles de aviación. Sin embargo, la elección del sistema es crucial, ya que la composición y cantidad depende de la especie de microalga y de la técnica de extracción (Shanmuganathan et al, 2023), puesto que se deben considerar algunos factores: tiempo de procesamiento, eficiencia, seguridad, viabilidad económica, preservación de las características y la naturaleza de los residuos generados (Straessner et al, 2023).…”

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Rompiendo barreras celulares: métodos aplicados en la extracción de lípidos en microalgas

Ortega-Clemente,

Mena-Vázquez,

Rodríguez-Ramírez

2024

CIENCIAUANL

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En la actualidad, diversos métodos han sido desarrollados al extraer lípidos de microalgas con la finalidad de aprovechar el perfil único de ácidos grasos que incluyen saturados e insaturados, los cuales poseen un potencial como materia prima para una variedad de productos, aplicaciones alimentarias, cosméticas y fuente de energía: biometano, biodiesel e incluso combustibles de aviación. Sin embargo, la elección del sistema es crucial, ya que la composición y cantidad depende de la especie de microalga y de la técnica de extracción, puesto que se deben considerar algunos factores: tiempo de procesamiento, eficiencia, seguridad, viabilidad económica, preservación de las características y la naturaleza de los residuos generados.

show abstract

Holistic exploitation of pulsed electric field (PEF)-treated and lipid extracted microalgae Auxenochlorella protothecoides, utilizing anaerobic digestion (AD)

Cited by 4 publications

References 75 publications

Excess of Water Enables Efficient Lipid Extraction from Wet Pulsed-Electric Field-Treated A. protothecoides Microalgae Using Immiscible Solvents

Excess of Water Enables Efficient Lipid Extraction from Wet Pulsed-Electric Field-Treated A. protothecoides Microalgae Using Immiscible Solvents

From Microalgae to Bioenergy: Recent Advances in Biochemical Conversion Processes

Rompiendo barreras celulares: métodos aplicados en la extracción de lípidos en microalgas

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