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Effective fractionation of microalgae biomass as an initial step for its utilization as a bioenergy feedstock
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Orientador(es)
Resumo(s)
Scenedesmus obliquus, a biotechnologically relevant microalgae, was grown in 70 L vertical photobioreactors
using non-supplemented secondary brewery wastewater as a culture medium. Upon collection, by mechanical
means, the cells were subjected to hydrothermal (autohydrolysis) and dilute acid hydrolysis (0.5 % sulfuric acid)
pre-treatments carried out using pressure micro-reactors under isothermal conditions up to 300 min.
Both processes enabled a high recovery of soluble sugars (~50 %) that were, in a great majority, present in the
added-value oligomeric form (92 % and 90.5 % for autohydrolysis and dilute acid hydrolysis, respectively).
Protein solubilization also presented relevant yields (35 % removal), with dilute acid hydrolysis allowing both
higher oligosaccharides and protein productivities at a milder temperature.
As compared to the current whole microalgae biomass-based upgrade strategies, the use of these mild processes
is extremely promising, as they will enable the future co-production of added-value oligosaccharides, and
protein, which can be relevant co-products of a biofuels-based biorefinery
Descrição
Palavras-chave
autohydrolysis biorefineries blue bioeconomy dilute acid hydrolysis protein, oligosaccharides pre-treatment Scenedesmus obliquus
Contexto Educativo
Citação
Energy Conversion and Management: X 16 (2022) 100317
Editora
Elsevier