Enhancing microalgal lipid accumulation for biofuel production

Zhu, Zhi Wei; Sun, Jin; Fei, Yun; Liu, Xufeng; Lindblad, Peter

doi:10.3389/fmicb.2022.1024441

Cited by 29 publications

(5 citation statements)

References 100 publications

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“…Lipid-rich microalgal strain is a prerequisite for bio-jet production in the HEFA process. However, the production of lipid-rich microalgal biomass is counterproductive [217], and extracting the lipid from the harvested biomass is energy-intensive [218]. Unless other value-added metabolites could be marketed in large volume, the application of the HEFA process would be limiting.…”

Section: Microalgal Biojet Fuelmentioning

confidence: 99%

Microalgal Feedstock for Biofuel Production: Recent Advances, Challenges, and Future Perspective

et al. 2023

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Globally, nations are trying to address environmental issues such as global warming and climate change, along with the burden of declining fossil fuel reserves. Furthermore, countries aim to reach zero carbon emissions within the existing and rising global energy crisis. Therefore, bio-based alternative sustainable feedstocks are being explored for producing bioenergy. One such renewable energy resource is microalgae; these are photosynthetic microorganisms that grow on non-arable land, in extreme climatic conditions, and have the ability to thrive even in sea and wastewater. Microalgae have high photosynthetic efficiencies and biomass productivity compared to other terrestrial plants. Whole microalgae biomass or their extracted metabolites can be converted to various biofuels such as bioethanol, biodiesel, biocrude oil, pyrolytic bio-oil, biomethane, biohydrogen, and bio jet fuel. However, several challenges still exist before faster and broader commercial application of microalgae as a sustainable bioenergy feedstock for biofuel production. Selection of appropriate microalgal strains, development of biomass pre-concentrating techniques, and utilization of wet microalgal biomass for biofuel production, coupled with an integrated biorefinery approach for producing value-added products, could improve the environmental sustainability and economic viability of microalgal biofuel. This article will review the current status of research on microalgal biofuels and their future perspective.

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Section: Microalgal Biojet Fuelmentioning

confidence: 99%

Microalgal Feedstock for Biofuel Production: Recent Advances, Challenges, and Future Perspective

et al. 2023

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“…Production of Diesel by microalgae strain is restricted to the laboratory experimental and pilot scale production as a result of costs associated with downstream and upstream production processes (Ambaye et al, 2021;Mahapatra et al, 2021;Mathimani & Mallick, 2018). Despite this challenges, a lots of strategies have been developed and adopted in a bid to reduce the cost of diesel production from microalgae isolates, discussions that have been entirely removed from the present findings that mainly targets usefulness and content of diesel obtained from microalgae, processes insights and factors during production process that hinder the yield and proper harvesting and methods of extraction (Ananthi et al, 2021;Zhu et al, 2022).…”

Section: Highlightsmentioning

confidence: 99%

Production and characterization of biodiesel from Chlorococcum sp.: A green microalgae

Oyelami

Azeez

Adekanmi³

et al. 2023

Environmental Quality Mgmt

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Present dependence on fossil sources for meeting energy demand globally is unsustainable as a result of non‐renewable and depleting supplies. Therefore, this study focuses on production and characterization of biodiesel by Chlorococcum littorale (Chlorococcum sp.) isolated from fish pond in Owode fish farm, Nigeria. Biomass concentration, lipid extraction and quantification were determined by filtration, solvent extraction and gravimetric methods. Extracted lipid was transesterified to diesel through process catalyzed by concentrated tetraoxosulphate (VI) acid. The constituents of fats in biodiesel produced were examined through chromatography of gas and spectroscopy of mass. Model prediction was used to assess physical and chemical parameters of biodiesel. The data gathered was subjected to statistical analysis. Chlorococcum sp. had biomass concentration (4.42 ± 0.02 g/L), Lipid content (67.75% and biodiesel yield (96.33%). Biodiesel had 48.3%, 29.20%, and 22.50% fatty acids that are saturated, monounsaturated and polyunsaturated, respectively. The biodiesel produced has the kinematic viscosity (2.74 mm2/s at 40°C); point of flash (245°C); point of cloud (7°C); point of pour (−2°C) and density (0.8760 g/cm3). Furthermore, the acidity level (0.44 mgKOH/g), value of saponification (186.49 mgKOH/g), value of peroxide (3.25 meq/kg), iodine content (38.27 mgI2/g) as well as the free fatty acid (1.34%), number of cetane (65.78), oxidative resistance (7.33 h), saturated factor of long chain (28.16°C), plugging point of cold filter (35.62°C) and high heating value (43.24°C) fell within required standard by international body. Thus, Chlorococcum sp. is ideal microalgae isolate for the biodiesel production. The biodiesel produced conform satisfactorily with the acceptable global standard.

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“…Additionally, up-regulation of KAS-I has been found to significantly enhance lipid synthesis. It has been suggested that the coordinated regulation of multiple genes involved in lipid synthesis may be more effective than targeting a single gene [239]. Overall, abiotic stress induction and gene regulation are feasible approaches to promote lipid synthesis…”

Section: Abiotic Stress Induced Genes Responsible For Lipid Productionmentioning

confidence: 99%

Advancement of Abiotic Stresses for Microalgal Lipid Production and Its Bioprospecting into Sustainable Biofuels

Singh,

Yadav,

Kumar

et al. 2023

Sustainability

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The world is currently facing global energy crises and escalating environmental pollution, which are caused by the extensive exploitation of conventional energy sources. The limited availability of conventional energy sources has opened the door to the search for alternative energy sources. In this regard, microalgae have emerged as a promising substitute for conventional energy sources due to their high photosynthetic rate, high carbohydrate and lipid content, efficient CO2 fixation capacity, and ability to thrive in adverse environments. The research and development of microalgal-based biofuel as a clean and sustainable alternative energy source has been ongoing for many years, but it has not yet been widely adopted commercially. However, it is currently gaining greater attention due to the integrated biorefinery concept. This study provides an in-depth review of recent advances in microalgae cultivation techniques and explores methods for increasing lipid production by manipulating environmental factors. Furthermore, our discussions have covered high lipid content microalgal species, harvesting methods, biorefinery concepts, process optimizing software tools, and the accumulation of triglycerides in lipid droplets. The study additionally explores the influence of abiotic stresses on the response of biosynthetic genes involved in lipid synthesis and metabolism. In conclusion, algae-based biofuels offer a viable alternative to traditional fuels for meeting the growing demand for energy.

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Enhancing microalgal lipid accumulation for biofuel production

Cited by 29 publications

References 100 publications

Microalgal Feedstock for Biofuel Production: Recent Advances, Challenges, and Future Perspective

Microalgal Feedstock for Biofuel Production: Recent Advances, Challenges, and Future Perspective

Production and characterization of biodiesel from Chlorococcum sp.: A green microalgae

Advancement of Abiotic Stresses for Microalgal Lipid Production and Its Bioprospecting into Sustainable Biofuels

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