Chlorella Microalga Biomass Cultivation for Obtaining Energy in Climatic Conditions of St. Petersburg

Politaeva, Natalia; Кузнецова, Т. А.; Smyatskaya, Yulia A.; Atamaniuk, Iryna; Trukhina, Elena

doi:10.1007/978-3-319-70987-1_59

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…Several factors are to be considered before extracting valuable compounds from microalgae. Studies show that the cultivation conditions significantly affect the growth rate and composition of microalgae biomass [48][49][50][51][52]. The effect of physical factors such as the light spectrum and intensity [49,50], IR, UV and laser radiation influence the cultivation rate and the composition of the biomass [51,52].…”

Section: Introductionmentioning

confidence: 99%

Obtaining DHA–EPA Oil Concentrates from the Biomass of Microalga Chlorella sorokiniana

et al. 2022

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Microalgae have attracted growing interest all around the world due to their potential applications in multiple sectors of industry, such as energetics, nutraceuticals, pharmaceuticals, agriculture, and ecology. Concepts of biorefinery of microalgae lipids for biodiesel production coupled with other applications have been suggested in several studies. However, very few studies focus on overcoming the degree of unsaturation of microalgae lipids using methods of fractionation. This study presents a method for obtaining two oil fractions from microalgae Chlorella sorokiniana suitable for food and biofuels via urea complex formation with further production of a long-chain PUFA concentrated oil suitable for the nutraceutical industry. A DHA–EPA-rich fraction was obtained from the dry microalga biomass using a succession of extraction, urea-complexation, fractionation, and esterification with glycerol. Analytical and organoleptic methods were used to assess the quality of the final product. Results show that the urea-complexation method allowed the obtaining of two lipid fractions with different fatty acid profiles. The urea complexed fraction (UCF) contained a majority of saturated fatty acids (54.46%); thus, it could find applications in the biofuels or food industry. The non-urea complexed fraction (NUCF) was rich in polyunsaturated fatty acids (PUFA) (81.00%), especially long-chain PUFA with 16.52% EPA and 35.08% DHA. The recovery rates of EPA and DHA in the NUCF reached 59% and 87.14%, respectively. Finally, the physicochemical and organoleptic characteristics of the DHA–EPA oil concentrate were determined and found conform to the norms recommended by the WHO/FAO standards for edible oils and the Russian State Standard GOST 1129-2013.

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Section: Introductionmentioning

confidence: 99%

Obtaining DHA–EPA Oil Concentrates from the Biomass of Microalga Chlorella sorokiniana

et al. 2022

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“…The biomass was grown in cultivators using a nutrient medium with a balanced composition of macro-and microelements. The optimal conditions for the cultivation of the biomass of Chlorella sorokiniana are presented in the following works [18][19][20][21]. The biomass was grown using fluorescent lamps for illumination, a constant aeration at a rate of 1.5 l/min and a temperature of 25°C.…”

Section: Methodsmentioning

confidence: 99%

Influence of the drying method on the sorption properties the biomass of Chlorella sorokiniana microalgae

et al. 2019

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In this paper, it is proposed to use the biomass of microalgae Chlorella sorokiniana as a biosorbent for wastewater treatment, as well as an oral sorbent. Biosorbents are capable of adsorbing both organic and inorganic compounds, including heavy metals. The sorption capacity depends on the type of aquatic plant and microalgae strain. The use of microalgae and aquatic plants as biosorbents for pollutant treatments is discussed in the introduction part. The biomass of microalgae Chlorella sorokiniana was chosen as the object of this study. The cultivation conditions (temperature, light, pH and aeration) and the optimal biomass harvesting parameters are presented. Dehydration of biomass was carried out in two ways: IR-drying and freeze-drying. The obtained samples were tested for the ability of the biomass to extract heavy metal ions (zinc, cadmium, zinc, copper) from standard solutions. The initial concentration of heavy metal ions in the working solutions was 10 mg/l. Results show that the lyophilized samples demonstrated up to 99.9% of heavy metal removal efficiency. The paper also presents the composition of Chlorella sorokiniana biomass, in which up to 40.97-41.87% are proteins. The analysis of the amino-acid composition showed a ratio of essential to non-essential amino-acids higher than 0.8. All the above results confirm the possibility of using microalgae biomass as an oral sorbent and as an additive in the production of functional foods.

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“…For our investigations it was used microalgae Chlorella Sorokiniana, its cultivation conditions are presented in [7][8][9]. It studied biomass concentration processes as follows: microalga Chlorella Sorokiniana suspension with optical density 1.160 was put in seven cylinders (volume of a cylinder is 500 ml, diameter is 90 mm, height is 390) together with reagents (coagulants, flocculants).…”

Section: Methodsmentioning

confidence: 99%

Concentration of Chlorella Sorokiniana Microalga Biomass at Combined Usage of Coagulants and Flocculants

Politaeva

Smyatskaya

Toumi

et al. 2018

Eurasian Chem. Tech. J.

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In this work there were studied various methods for concentrating the algae biomass, and mechanisms of concentration processes of the microalgae cells. Presented are papers devoted to usage of various coagulants and flocculants (iron (III) chlorides and sulphates, titanium tetrachloride, slaked lime, potassium chloride, potassium permanganat, aluminum potassium sulphates, Flopam FO 4550 SH). In the experimental part there is studied the usage of FeCl3*6H2O coagulant in the amount of 4, 6, 8, 10, 20, 30 mg/l of microalga Chlorella Sorokiniana suspension. Microstructure investigations have shown that at addition of ferrous chloride of concentration more than 20 mg/l, the cell death is more than 50%. Concentrations from 4 to 10 mg/l achieve low degree of precipitation (not more than 18%). Aiming at increasing degree of precipitation we investigated usage of two-component system coagulant-flocculant. Usage of two-component system results in a significant increase of precipitation degree of microalga Chlorella Sorokiniana: at addition of chitosan the degree reaches 53%, at addition of PAA it is 79%. It was determined the volume of the thickened biomass sludge. It shows that usage of chitosan results in more tightened biomass layer, which occupies minimal volume (V = 140 ml). The following three-component mixture is an optimum variant for high-efficient precipitation of biomass: coagulant FeCl3 in the amount of 6 mg/l; flocculants as a mixture of chitosan 2% and PAA 1% in the amount of 10 ml/l. Addition of chitosan solution as a flocculant results in decrease of pH value, which is caused by usage of acetic acid for preparation of chitosan solution. Microstucture analysis of the precipitated biomass shows that at coloration of Chlorella Sorokiniana cells by methylene blue, the amount of dead (colored) cells is not less than 5%. Consequently, the precipitated biomass might be used for obtaining of valuable components.

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Chlorella Microalga Biomass Cultivation for Obtaining Energy in Climatic Conditions of St. Petersburg

Cited by 15 publications

References 3 publications

Obtaining DHA–EPA Oil Concentrates from the Biomass of Microalga Chlorella sorokiniana

Obtaining DHA–EPA Oil Concentrates from the Biomass of Microalga Chlorella sorokiniana

Influence of the drying method on the sorption properties the biomass of Chlorella sorokiniana microalgae

Concentration of Chlorella Sorokiniana Microalga Biomass at Combined Usage of Coagulants and Flocculants

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