Hydrothermal liquefaction of residual microalgae biomass after pulsed electric field-assisted valuables extraction

Guo, Bingfeng; Yang, Boda; Silve, Aude; Akaberi, Sahar; Scherer, Daniel; Papachristou, Ioannis; Frey, Wolfgang; Hornung, Ursel; Dahmen, Nicolaus

doi:10.1016/j.algal.2019.101650

Cited by 36 publications

(14 citation statements)

References 41 publications

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“…A few studies regarding the extraction of multiple products from microalgae with PEF (usually, proteins and carbohydrates) do exist [42,43] although in these cases, the compounds are extracted together and not in a true cascade format. Guo et al also evaluated the valorization of residual biomass through hydrothermal liquefaction after the extraction of one product (lipids, proteins or amino acids) [44]. Αn example of cascade extraction of different components from microalgae utilizing PEF, was a previous work of our group [45], where carbohydrate and lipid extractions were performed in two different steps after PEF-treatment of wet Auxenochlorella protothecoides.…”

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confidence: 99%

Analysis of the lipid extraction performance in a cascade process for Scenedesmus almeriensis biorefinery

Papachristou

Akaberi

Silve

et al. 2021

Biotechnol Biofuels

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Background Microalgae have attracted considerable interest due to their ability to produce a wide range of valuable compounds. Pulsed Electric Fields (PEF) has been demonstrated to effectively disrupt the microalgae cells and facilitate intracellular extraction. To increase the commercial viability of microalgae, the entire biomass should be exploited with different products extracted and valorized according to the biorefinery scheme. However, demonstrations of multiple component extraction in series are very limited in literature. This study aimed to develop an effective lipid extraction protocol from wet Scenedesmus almeriensis after PEF-treatment with 1.5 MJ·kgDW−1. A cascade process, i.e., the valorization of several products in row, was tested with firstly the collection of the released carbohydrates in the water fraction, then protein enzymatic hydrolysis and finally lipid extraction. Biomass processed with high pressure homogenization (HPH) on parallel, served as benchmark. Results Lipid extraction with ethanol:hexane (1:0.41 vol/vol) offered the highest yields from the different protocols tested. PEF-treatment promoted extraction with almost 70% of total lipids extracted against 43% from untreated biomass. An incubation step after PEF-treatment, further improved the yields, up to 83% of total lipids. Increasing the solvent volume by factor 2 offered no improvement. In comparison, extraction with two other systems utilizing only ethanol at room temperature or elevated at 60 °C were ineffective with less than 30% of total lipids extracted. Regarding cascade extraction, carbohydrate release after PEF was detected albeit in low concentrations. PEF-treated samples displayed slightly better kinetics during the enzymatic protein hydrolysis compared to untreated or HPH-treated biomass. The yields from a subsequent lipid extraction were not affected after PEF but were significantly increased for untreated samples (66% of total lipids), while HPH displayed the lowest yields (~ 49% of total lipids). Conclusions PEF-treatment successfully promoted lipid extraction from S. almeriensis but only in combination with a polar:neutral co-solvent (ethanol:hexane). After enzymatic protein hydrolysis in cascade processing; however, untreated biomass displayed equal lipid yields due to the disruptive effect of the proteolytic enzymes. Therefore, the positive impact of PEF in this scheme is limited on the improved reaction kinetics exhibited during the enzymatic hydrolysis step.

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confidence: 99%

Analysis of the lipid extraction performance in a cascade process for Scenedesmus almeriensis biorefinery

Papachristou

Akaberi

Silve

et al. 2021

Biotechnol Biofuels

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“…One possible solution to enhance the economic viability of algal biorefinery is to integrate the production of high value products like bioactive compounds into an algae biorefinery system. 124 Guo et al 125 demonstrated the viability of this integration by extracting valuable biochemicals including lipid, protein, and amino acids from Auxenochlorella protothecoides, C. vulgaris, and S. almeriensis and converting the extracted residues via HTL into bio-oil. Algae cultivation in wastewater is another approach to enhance the sustainability of algae biorefinery.…”

Section: Main Challengesmentioning

confidence: 99%

Recent Advances in Algae-Derived Biofuels and Bioactive Compounds

Feng

Kang

Salaudeen

et al. 2022

Ind. Eng. Chem. Res.

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Owing to the declining reserve of fossil resources as well as more concerns on climate change, and essential energy security, and especially the broad consensus on carbon neutralization, it is significantly critical to develop renewable and sustainable energy and chemicals. Algae as alternative resources can be applied to produce biofuels and biochemicals. Among them, algae-derived natural pigments exhibit high market value due to their uses in pharmaceutical and food industries. As a result of the developments of engineering tools, it is feasible to scale up algal processing and applications. Prior to the industrial implementation, life cycle assessment is required to ensure the environmental feasibility of algae-based biofuels and biochemicals. In this article, recent advances in processing algae for liquid, gas, and solid fuels are reviewed. New approaches for enhancing the natural pigment accumulation are also discussed. Recent studies on life cycle assessment of algae-based biofuels and biochemicals, as well as the main challenges faced by the algal biorefinery, are discussed in this manuscript.

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“…7 ) (Elliott et al 2015 ; Elliott 2016 ; Jones et al 2014 ; Vardon et al 2012 ). The most promising part of this technology is that whole biomass slurry is converted to bio-crude oil without any waste and biomass drying after extraction of valuable compounds (Guo et al 2019b ). Importantly, the obtained bio-oil can be further processed using established petroleum refineries (Elliott 2016 ; US Department of Energy 2015 ; 2016 ).…”

Section: Biofuel Feedstocks Affect Food Energy and Environmentmentioning

confidence: 99%

Roadmap to sustainable carbon-neutral energy and environment: can we cross the barrier of biomass productivity?

Maurya

Mondal

Kumar

et al. 2021

Environ Sci Pollut Res

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The total number of inhabitants on the Earth is estimated to cross a record number of 9 × 10 3 million by 2050 that present a unique challenge to provide energy and clean environment to every individual. The growth in population results in a change of land use, and greenhouse gas emission due to increased industrialization and transportation. Energy consumption affects the quality of the environment by adding carbon dioxide and other pollutants to the atmosphere. This leads to oceanic acidification and other environmental fluctuations due to global climate change. Concurrently, speedy utilization of known conventional fuel reservoirs causes a challenge to a sustainable supply of energy. Therefore, an alternate energy resource is required that can maintain the sustainability of energy and environment. Among different alternatives, energy production from high carbon dioxide capturing photosynthetic aquatic microbes is an emerging technology to clean environment and produce carbon-neutral energy from their hydrocarbon-rich biomass. However, economical challenges due to low biomass production still prevent the commercialization of bioenergy. In this work, we review the impact of fossil fuels burning, which is predominantly used to fulfill global energy demand, on the quality of the environment. We also assess the status of biofuel production and utilization and discuss its potential to clean the environment. The complications associated with biofuel manufacturing using photosynthetic microorganisms are discussed and directed evolution for targeted phenotypes and targeted delivery of nutrients are proposed as potential strategies to increase the biomass production.

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Hydrothermal liquefaction of residual microalgae biomass after pulsed electric field-assisted valuables extraction

Cited by 36 publications

References 41 publications

Analysis of the lipid extraction performance in a cascade process for Scenedesmus almeriensis biorefinery

Analysis of the lipid extraction performance in a cascade process for Scenedesmus almeriensis biorefinery

Recent Advances in Algae-Derived Biofuels and Bioactive Compounds

Roadmap to sustainable carbon-neutral energy and environment: can we cross the barrier of biomass productivity?

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