Biochar production from microalgae: a new sustainable approach to wastewater treatment based on a circular economy.

The generation of wastewater due to human activities are the main responsible for environmental problems. These problems are caused by the large amount of organic and inorganic pollutants related to the presence of pesticides, metals, pathogens, drugs and dyes. The photosynthetic treatment of effluents emerges as a sustainable and low-cost alternative for developing wastewater treatment systems based on a circular economy.

Renewal of nanofibers in Chlorella fusca microalgae cultivation to increase CO fixation.

This study explored strategies to increase the CO fixation ability of microalgae by renewing polymeric nanofibers in cultures of Chlorella fusca LEB 111. Nanofibers composed of 10% (w v) polyacrylonitrile (PAN)/dimethylformamide (DMF) containing 4% (w v) iron oxide nanoparticles (NPsFeO) were added to photobioreactors. The nanomaterial was renewed in the test cultures as follows: renewal only on day 7; renewal only on day 15; or renewal on both days 7 and 15 (i.

Physical and biological fixation of CO with polymeric nanofibers in outdoor cultivations of Chlorella fusca LEB 111.

The objective of this study was to cultivate Chlorella fusca LEB 111 with nanofibers indoors and outdoors to verify the effect on CO biofixation and macromolecule production. The microalgae were cultured with 10% (w v) polyacrylonitrile (PAN)/dimethylformamide (DMF) nanofibers containing 4% (w v) iron oxide nanoparticles (NPsFeO), which were added to the cultivations at concentrations of 0, 0.1, 0.

Green alga cultivation with nanofibers as physical adsorbents of carbon dioxide: Evaluation of gas biofixation and macromolecule production.

The objective of this study was to evaluate the biofixation and production of biocompounds by Chlorella fusca LEB 111 cultivated with different concentrations of carbon dioxide (CO) adsorbent nanofibers in their free form or retained. Cultures were grown in 15% (v v) CO with 0.1, 0.

Innovative nanofiber technology to improve carbon dioxide biofixation in microalgae cultivation.

The aim of this study was to develop nanofibers containing nanoparticles with potential for the biological fixation of CO together with the microalgae Chlorella fusca LEB 111. An electrospinning technique was used for the production of polymeric nanofibers with different concentrations of iron oxide nanoparticles: 0, 2, 4, 6, 8, and 10% (w v). Nanofibers with a nanoparticle concentration of 4% (w v) were selected for use in the microalgal cultivation due to their smaller diameter (434 nm), high specific surface area (13.

Nanoencapsulation of the Bioactive Compounds of Spirulina with a Microalgal Biopolymer Coating.

Microalgae have been studied in biotechnological processes due to the various biocompounds that can be obtained from their biomasses, including pigments, proteins, antioxidants, biopeptides, fatty acids and biopolymers. Microalgae biopolymers are biodegradable materials that present similar characteristics to traditional polymers, with the advantage of being rapidly degraded when discarded. In addition, nanoencapsulation is capable of increasing the availability of bioactive compounds by allowing the release of these biocompounds to occur slowly over time.

CO2 Biofixation by the Cyanobacterium Spirulina sp. LEB 18 and the Green Alga Chlorella fusca LEB 111 Grown Using Gas Effluents and Solid Residues of Thermoelectric Origin.

The concentration of carbon dioxide (CO2) in the atmosphere has increased from 280 to 400 ppm in the last 10 years, and the coal-fired power plants are responsible for approximately 22 % of these emissions. The burning of fossil fuel also produces a great amount of solid waste that causes serious industrial and environmental problems. The biological processes become interesting alternative in combating pollution and developing new products.

Biologically Active Metabolites Synthesized by Microalgae.

Microalgae are microorganisms that have different morphological, physiological, and genetic traits that confer the ability to produce different biologically active metabolites. Microalgal biotechnology has become a subject of study for various fields, due to the varied bioproducts that can be obtained from these microorganisms. When microalgal cultivation processes are better understood, microalgae can become an environmentally friendly and economically viable source of compounds of interest, because production can be optimized in a controlled culture.

Biological effects of Spirulina (Arthrospira) biopolymers and biomass in the development of nanostructured scaffolds.

Spirulina is produced from pure cultures of the photosynthetic prokaryotic cyanobacteria Arthrospira. For many years research centers throughout the world have studied its application in various scientific fields, especially in foods and medicine. The biomass produced from Spirulina cultivation contains a variety of biocompounds, including biopeptides, biopolymers, carbohydrates, essential fatty acids, minerals, oligoelements, and sterols.