The application of microalgae biomass and bio-products as aquafeed for aquaculture

Algae biomass is considered as an alternative raw material for the production of biofuels. The search for new types of raw materials, including high-energy types of microalgae, remains relevant, since the share of motor fuels in the structure of the global fuel and energy balance remains consistently high (about 35%), and the price of oil is characterized by high volatility. The authors have considered the advantages of microalgae as sources of raw materials for fuel production. Biochemical and thermochemical conversion are proposed as technologies for their processing. This paper presents the results of the study of the pyrolysis of the biomass of clonal culture of blue-green microalgae / cyanobacteriumArthrospira platensis rsemsu 1/02-Pfrom the collection of the Research Laboratory of Renewable Energy Sources of the Lomonosov Moscow State University. An experiment to study the process of pyrolysis of microalgae biomass was carried out at the experimental facility of the Institute of High Temperatures RAS in pure nitrogen grade 6.0 to create an oxygen-free environment with a linear heating rate of 10 ºС / min from room temperature to 1000 ºС. The whole process of pyrolysis proceeded in the field of endothermy. The specific amounts of solid residue, pyrolysis liquid and gaseous products were experimentally determined. As a result of the pyrolysis of microalgae biomass weighing 15 g, the following products were obtained: 1) coal has the mass of the solid residue is 2.68 g, or 17.7% of the initial mass of the microalgae (while 9.3% of the initial mass of the microalgae remained in the reactor); 2) pyrolysis liquid – weight 3.3 g, or 21.9% of the initial weight; 3) non-condensable pyrolysis gases – weight 1.15 l. The specific volumetric gas yield (the amount of gas released from 1 kg of the starting material) was 0.076 Nm3/ kg. The analysis of the composition and specific volume yield of non-condensable pyrolysis gases formed in the process of pyrolysis, depending on temperature. It is shown that with increasing temperature, the proportion of highcalorie components of the gas mixture (hydrogen, methane and carbon monoxide) increases. The calorific value of the mixture of these gases has been estimated.

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STUDY AND CHARACTERIZATION GROWTH OF FOUR MICROALGAE SPECIES AND TEST ANTIMICROBIAL ACTIVITY

Jurnal Zarah ◽

10.31629/zarah.v6i2.625 ◽

2018 ◽

Vol 6 (2) ◽

pp. 53-58

Author(s):

Marniati Salim

Keyword(s):

Dunaliella Salina ◽

Methanol Extract ◽

Sea Water ◽

Basal Medium ◽

Nannochloropsis Oculata ◽

Inhibitory Zone ◽

Antimicrobial Sensitivity ◽

Sensitivity Tests ◽

Microalgae Biomass ◽

Chaetoceros Calcitrans

Abstract In this study to the growth characteristics of microalgae (Dunaliella salina, Nannochloropsis oculata, Tetrasel mis chuii & Chaetoceros calcitrans), in different mediums, namely Bold’s Basal Medium (BBM) and BBM modification of sea water. The results obtained from microalgae (N.oculata, T.chuii, C.calcitrans) are better grown on BBM media while microlaga D.salina grows well on BBM modification of sea water. Microalgae biomass is extracted by maceration method in hexane and methanol solvents. Test bacteria used gram positive (Staphylococcus aureus) and gram negative (Escherichia coli). Inhibitory zone diameter results were compared with antimicrobial sensitivity tests according to Clinical and Laboratory Standards Institute (CLSI). From the results of microalgae hexane and methanol extract antibacterial activity tests (D.salina, N.oculata, T.chuii, C.calcitrans) showed that the extract was not too sensitive to inhibit bacterial growth. Keywords: microalgae, medium, antimicrobial

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Computational evaluation of microalgae biomass conversion to biodiesel

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-01314-2 ◽

2021 ◽

Author(s):

Momir Milić ◽

Biljana Petković ◽

Abdellatif Selmi ◽

Dalibor Petković ◽

Kittisak Jermsittiparsert ◽

...

Keyword(s):

Biomass Conversion ◽

Computational Evaluation ◽

Microalgae Biomass

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Tuning Microbial Community in Non-Conventional Two-Stage Anaerobic Bioprocess for Microalgae Biomass Valorization into Targeted Bioproducts

Bioresource Technology ◽

10.1016/j.biortech.2021.125387 ◽

2021 ◽

pp. 125387

Author(s):

Mercedes Llamas ◽

Silvia Greses ◽

Elia Tomás-Pejó ◽

Cristina González-Fernández

Keyword(s):

Microbial Community ◽

Two Stage ◽

Biomass Valorization ◽

Microalgae Biomass

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Sugar and no sugar added fruit microalgae-enriched jams: a study about their physicochemical, rheological, and textural properties

European Food Research and Technology ◽

10.1007/s00217-021-03819-6 ◽

2021 ◽

Author(s):

Zaida Natalia Uribe-Wandurraga ◽

María Bravo-Villar ◽

Marta Igual ◽

Carmen Savall ◽

Purificación García-Segovia ◽

...

Keyword(s):

Food System ◽

Textural Properties ◽

Arthrospira Platensis ◽

Microalgae Biomass ◽

Textural Parameters ◽

Weak Gel ◽

Biomass Extract ◽

And Control ◽

Colour Coordinates ◽

Control Samples

AbstractJams are preparations of fruits whose main preserving agent is sugar. Due to this, health concerns of consumers have resulted in a sugar reduction, and its replacement using alternative sweeteners and introducing new ingredients enhancing nutritional properties. In this study, four types of fruits jams (plum, strawberry, apple, and peach), with or without sugar, were prepared using two microalgae biomass, Arthrospira platensis (Spirulina) and Chlorella vulgaris, and Dunaliella salina extract as ingredients at different mix levels of concentrations, 0.10%–0.10%–0.05% respectively, for plum; 0.04%–0.00%–0.01 respectively, for strawberry; 0.06%–0.04%–0.00% respectively, for apple and 0.00%–0.01%–0.04% respectively, for peach. Physicochemical, rheological, and textural parameters were evaluated. Substitution of sugar/fructose syrup in the jam’s preparation caused changes in pH values, solid soluble content, and rheological and textural properties compared to sugar jams. Using sugar or sweeteners as isomalt, stevia and sucralose and microalgae biomass or extract showed significant changes in colour coordinates, however, these differences were not perceptible by the human eye. Jams containing microalgae biomass-extract showed higher G', G'', G*, and η* values than their corresponding control samples. All the jams presented weak-gel characteristics, distinguishing fruit jams. However, the results of weak-gel model analysis suggest that the influence of the different ingredients in the food system depends not only on their concentration but also on the interactions in the gel structure. Strawberry and apple jams showed no significant differences between microalgae biomass-extract samples and control samples, for both sugar and no sugar added jams being the best-obtained samples.

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Biological activities and plant growth regulators producing from some microalgae biomass cultivated in different wastewater concentrations

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-01610-x ◽

2021 ◽

Author(s):

Walaa M. Elakbawy ◽

Sanaa M. M. Shanab ◽

Emad A. Shalaby

Keyword(s):

Plant Growth ◽

Plant Growth Regulators ◽

Growth Regulators ◽

Biological Activities ◽

Microalgae Biomass

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Controlling of two destructive zooplanktonic predators in Chlorella mass culture with surfactants

Biotechnology for Biofuels ◽

10.1186/s13068-021-01873-6 ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Xiaobin Wen ◽

Aoqi Zhang ◽

Xiaoyan Zhu ◽

Lin Liang ◽

Yan Huo ◽

...

Keyword(s):

Mass Culture ◽

Chemical Method ◽

Sodium Dodecyl ◽

Sodium Dodecyl Benzene Sulfonate ◽

Biofuel Production ◽

Benzene Sulfonate ◽

Microalgae Biomass ◽

Mass Cultures ◽

Dodecyl Benzene Sulfonate ◽

Raceway Ponds

Abstract Background Predatory flagellates and ciliates are two common bio-contaminants which frequently cause biomass losses in Chlorella mass culture. Efficient and targeted ways are required to control these contaminations in Chlorella mass cultivation aiming for biofuel production especially. Results Five surfactants were tested for its ability to control bio-contaminations in Chlorella culture. All five surfactants were able to eliminate the contaminants at a proper concentration. Particularly the minimal effective concentrations of sodium dodecyl benzene sulfonate (SDBS) to completely eliminate Poterioochromonas sp. and Hemiurosomoida sp. were 8 and 10 mg L−1, respectively, yet the photosynthesis and viability of Chlorella was not significantly affected. These results were further validated in Chlorella mass cultures in 5, 20, and 200 m2 raceway ponds. Conclusions A chemical method using 10 mg L−1 SDBS as pesticide to control predatory flagellate or ciliate contamination in Chlorella mass culture was proposed. The method helps for a sustained microalgae biomass production and utilization, especially for biofuel production.

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