The role of microalgae in the bioeconomy

Fernández, Francisco Gabriel Acién; Reis, Alberto; Wijffels, René H.; Barbosa, María J.; Verdelho, Vítor; Llamas, Bernardo

doi:10.1016/j.nbt.2020.11.011

Cited by 189 publications

(100 citation statements)

References 52 publications

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“…Microalgae usually refer to a wide group of microscopic organisms that are capable of carrying out the oxygenic photosynthesis. This includes eukaryotic microalgae and prokaryotic cyanobacteria (Acién et al, 2021;Umamaheswari & Shanthakumar, 2016). Generally, microalgae use the photoautrotophic metabolism to grow, that is, they use an inorganic carbon source; light as an energy source; and nutrients to produce carbohydrates, lipids, proteins, and so forth.…”

Section: Microalgae Cultivationmentioning

confidence: 99%

“…Open systems are usually the most economical option (Acién et al, 2021;Acién Fernández et al, 2018). However, as they have no physical barriers between the culture and the atmosphere, they are significantly more affected than closed PBRs by the contamination of competing organisms and grazers, which negatively affects microalgae performance ( Day et al, 2017;Galès et al, 2019).…”

Section: Open/closed Systemsmentioning

confidence: 99%

“…Consequently, microalgae in the deepest places of the reactor remain light-limited or even in complete darkness, reducing microalgae productivity (Fernández et al, 2016;Raeisossadati, Moheimani, & Parlevliet, 2019). For this reason, light path in microalgae reactors tends to be short, that is, around 15-30 cm for raceway ponds (Acién et al, 2021;Arbib, de Godos, Ruiz, & Perales, 2017) and in the range of 2-10 cm for closed PBRs (González-Camejo, Aparicio, et al, 2020; Slegers, Wijffels, van Straten, & van Boxtel, 2011). However, it must be considered that the shorter the light path, the higher the risk of overheating, which can be detrimental for microalgae growth (see Section 2.1.12).…”

Section: Light Pathmentioning

confidence: 99%

“…Mixing also plays a significant role in determining the operating costs of the treatment systems. In this respect, raceway ponds (Section 3.1.2) are usually mixed using paddlewheels, which energy requirements are less than 10 W m −3 , while air sparging of closed PBRs (Section 3.1.3) can consume up to 400 W m −3 (Acién et al, 2021).…”

Section: Mixingmentioning

confidence: 99%

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Outdoor microalgae‐based urban wastewater treatment: Recent advances, applications, and future perspectives

et al. 2021

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Although microalgae‐based wastewater treatment has been traditionally carried out in extensive waste stabilization ponds, recent trends focus on the use of microalgae to apply the circular economy principles in the wastewater treatment sector due to the capacity of algae to absorb carbon dioxide while recovering nutrients from sewage. To this aim, the development of new intensive microalgae‐based systems with higher efficiency and level of process control is required. Results obtained for these systems at lab scale are generally promising. However, upscaling to outdoor conditions is often uncertain. Some advances have been made in terms of applying open systems at large scale. However, there are still some issues related to land requirements and the economic feasibility and robustness of the process that have to be overcome to widely implement these systems. This article aims at describing the main design and operating factors regarding outdoor microalgae cultivation. It will also explain some microalgae cultivation technologies to treat wastewater, showing their advantages, disadvantages, and the possibility to treat different wastewater streams with microalgae cultures. Future perspectives of this biotechnology will be commented as well. This article is categorized under: Engineering Water > Engineering Water

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Section: Microalgae Cultivationmentioning

confidence: 99%

Section: Open/closed Systemsmentioning

confidence: 99%

Section: Light Pathmentioning

confidence: 99%

Section: Mixingmentioning

confidence: 99%

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Outdoor microalgae‐based urban wastewater treatment: Recent advances, applications, and future perspectives

et al. 2021

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“…Within these concepts, metabolically-engineered microalgae could become renewable and environment-friendly sources of diverse carbon-based compounds [ 1 ] and fuels [ 2 ]. Among biotechnologically suitable microorganisms, microalgae are especially promising, since they are photoautotrophic and readily cultivateable in cheap water-based media, using sunlight and carbon dioxide [ 3 ]. Metabolic engineering and synthetic biology approaches can substantially expand the range of products obtainable from microalgae [ 4 ] and increase their photoautotrophic productivity [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

A novel, robust and mating-competent Chlamydomonas reinhardtii strain with an enhanced transgene expression capacity for algal biotechnology

Dementyeva¹,

Freudenberg²,

Baier³

et al. 2021

Biotechnology Reports

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Highlights Widely applicable UV mutagenesis method to improve transgene expression in the microalga Chlamydomonas . New CC-1690*** chassis strain with shear stress tolerance, mating-competence and high transgene expression capacity. Proof-of-concept cadaverine production from CO 2 with CC-1690***.

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