Microalgae-Based Biorefineries as a Promising Approach to Biofuel Production

Costa, Jorge Alberto Vieira; Moraes, Luiza; Moreira, Juliana Botelho; Rosa, Gabriel Martins da; Henrard, Adriano Seizi Arruda; Morais, Michele Greque de

doi:10.1007/978-981-10-1950-0_4

Cited by 9 publications

(5 citation statements)

References 160 publications

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“…SO 2 was much more dangerous than NO. The presence of SO 2 at high concentrations can inhibit the growth of microalgae [40] due to a decrease in pH [41]. Our findings showed that the injection of simulated flue gas containing 80–100 ppm SO 2 promoted the growth of the C. vulgaris ESP-31 mutants.…”

Section: Discussionmentioning

confidence: 68%

Isolation and characterization of Chlorella sp. mutants with enhanced thermo- and CO2 tolerances for CO2 sequestration and utilization of flue gases

Chou

Song

et al. 2019

Biotechnol Biofuels

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Background The increasing emission of flue gas from industrial plants contributes to environmental pollution, global warming, and climate change. Microalgae have been considered excellent biological materials for flue gas removal, particularly CO2 mitigation. However, tolerance to high temperatures is also critical for outdoor microalgal mass cultivation. Therefore, flue gas- and thermo-tolerant mutants of Chlorella vulgaris ESP-31 were generated and characterized for their ability to grow under various conditions. Results In this study, we obtained two CO2- and thermo-tolerant mutants of Chlorella vulgaris ESP-31, namely, 283 and 359, with enhanced CO2 tolerance and thermo-tolerance by using N-methyl-N-nitro-N-nitrosoguanidine (NTG) mutagenesis followed by screening at high temperature and under high CO2 conditions with the w-zipper pouch selection method. The two mutants exhibited higher photosynthetic activity and biomass productivity than that of the ESP-31 wild type. More importantly, the mutants were able to grow at high temperature (40 °C) and a high concentration of simulated flue gas (25% CO2, 80–90 ppm SO2, 90–100 ppm NO) and showed higher carbohydrate and lipid contents than did the ESP-31 wild type. Conclusions The two thermo- and flue gas-tolerant mutants of Chlorella vulgaris ESP-31 were useful for CO2 mitigation from flue gas under heated conditions and for the production of carbohydrates and biodiesel directly using CO2 from flue gas.

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Section: Discussionmentioning

confidence: 68%

Isolation and characterization of Chlorella sp. mutants with enhanced thermo- and CO2 tolerances for CO2 sequestration and utilization of flue gases

Chou

Song

et al. 2019

Biotechnol Biofuels

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“…46 Carbohydrates can be used both as a raw material for bioethanol production 47 and as sources of high-value-added compounds. 48 In conclusion, endogenous IAA and tZ were identified in the biomass of C. fusca LEB 111, C. vulgaris LEB 112, S. obliquus LEB 117, S. nidulans LEB 115 and Spirulina sp. LEB 18, under autotrophic light/dark (12/12 h) photoperiods, autotrophic continuous light (24 h) and heterotrophic conditions.…”

Section: Discussionmentioning

confidence: 83%

“…Lipids can be used also in the production of biodiesel and as sources of high‐value‐added compounds, such as polyunsaturated fatty acids that can be used in human food 46 . Carbohydrates can be used both as a raw material for bioethanol production 47 and as sources of high‐value‐added compounds 48 …”

Section: Discussionmentioning

confidence: 99%

Identification of the phytohormones indole‐3‐acetic acid and trans‐zeatin in microalgae

Cruz

Rosa

Costa

2023

J of Chemical Tech & Biotech

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BACKGROUND: Microalgae can biosynthesize phytohormones that promote plant growth and development. These compounds can potentially replace synthetic agricultural inputs that are harmful to the environment. The main plant growth-promoting phytohormones present in microalgae are auxins and cytokinins. The objective of this study was to evaluate the influence of culture conditions (autotrophic and heterotrophic) on the concentrations of the endogenous phytohormones indole-3-acetic acid (IAA) and trans-zeatin (tZ) in the microalgae Chlorella fusca LEB 111, Chlorella vulgaris LEB 112, Scenedesmus obliquus LEB 117, Synechococcus nidulans LEB 115 and Spirulina sp. LEB 18.RESULTS: All microalgae produced IAA and tZ under the three evaluated conditions (autotrophic light/dark (12/12 h), autotrophic continuous light (24 h) and heterotrophic). The IAA concentrations ranged from 1.94 to 56.45 nmol g −1 , whereas those of tZ ranged from 0.06 to 35.52 pmol g −1 . The cultivation conditions increased the carbohydrate and protein concentrations. Continuous light favored the production of carbohydrates in the studied cyanobacteria (Synechococcus nidulans LEB 115 and Spirulina sp. LEB 18). However, the light/dark condition (12/12 h) afforded the highest protein concentrations for green algae and cyanobacteria. There were no statistically significant differences in the lipid content of the strains studied. CONCLUSIONS:The results of this study are valuable and indicate that the cultivation conditions and species used in this study may be applied in sustainable agriculture, providing alternatives that may contribute to minimizing the environmental impact of synthetic chemical inputs in agriculture.

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“…Microalgae use inorganic nitrogen and phosphorus for growth [17][18][19] and due to their high resistance to pollution and the ability to easily adapt to environmental conditions they are able to proliferate in many types of wastewater 16 . Many researchers suggest using municipal, domestic, agricultural (containing nutrients from fertilizers 20 ) and industrial wastewater, effluents from landfills and biologically treated sewage for cultivation of microalgae 3,14,16,21 .…”

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confidence: 99%

“…Many researchers suggest using municipal, domestic, agricultural (containing nutrients from fertilizers 20 ) and industrial wastewater, effluents from landfills and biologically treated sewage for cultivation of microalgae 3,14,16,21 . The use of biofilm and sewage in algae cultivation contributes not only to a significant reduction of costs of biomass production, but also to the removal of nutrients, heavy metals, suspended solids, as well as toxic organic compounds 10,17,22 .…”

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confidence: 99%

The use of a natural substrate for immobilization of microalgae cultivated in wastewater

Garbowski

Pietryka

Pulikowski

et al. 2020

Sci Rep

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The methods of separation of microalgae has a significant impact in the economic aspects of their cultivation. in this study, pine bark was used as a substrate for immobilization of microalgal biomass cultivated in raw municipal sewage. the experiment was conducted in cylindrical photobioreactors (PBRs) with circulation of wastewater. Biomass was cultivated for 42 days. After that time, abundant growth of the biofilm with microalgae on the surface of pine bark as well as improvement of the quality of treated sewage were observed. The efficiency of removal of nutrients from wastewater was 64-81% for total nitrogen and 97-99% for total phosphorus. Moreover, the concentration of suspended solids in sewage was reduced, which resulted in a decrease in turbidity by more than 90%. Colorimetric analysis and Volatile Matter (VM) content in the substrate showed a decrease in the Higher Heating Value (HHV) and concentration of VM due to the proliferation of biofilm.

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Microalgae-Based Biorefineries as a Promising Approach to Biofuel Production

Cited by 9 publications

References 160 publications

Isolation and characterization of Chlorella sp. mutants with enhanced thermo- and CO2 tolerances for CO2 sequestration and utilization of flue gases

Isolation and characterization of Chlorella sp. mutants with enhanced thermo- and CO2 tolerances for CO2 sequestration and utilization of flue gases

Identification of the phytohormones indole‐3‐acetic acid and trans‐zeatin in microalgae

The use of a natural substrate for immobilization of microalgae cultivated in wastewater

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