Data/hora: 12/06/2024 17:19:21

Provedor de dados: | 111
País: | China
Título: | Effects of temperature and time on oil extraction from some Nigerian indigenous fresh water microalgae species
Autores: | Asoiro, Felix Uzochukwu; Okonkwo, Wilfred Ifeanyi; Akubuo, Clement Onyeaghala; Nweze, Nkechinyere O.; Anyanwu, Cosmas Ngozichukwu.
Data: | 2019-07-28
Ano: | 2019
Palavras-chave: | Agricultural engineering; Bioresources engineering; Biotechnology; Energy; Renewable energy; Agriculture. oil yield; Dictyosphaerium spp; Desmodesmus subspicatus; Chlorella lewinii; Cosmarium spp; Growth rate.
Resumo: | This study determined the effects of temperature and time on oil extraction from indigenous freshwater microalgae– Dictyosphaerium, Chlorella, Desmodesmus and Cosmarium species, cultured in fifteen 2-litre column photobioreactors (PBR) (three per specie).  Growth and specific growth rates for the mixotrophic&gt;autotrophic cultivation of the species. Oil was extracted from the dried microalgae species at temperatures ranging from 40 to 120 °C at 20 oC intervals and times ranging from 30 to 210 minutes at 30 minutes’ intervals, by accelerated solvent extraction method. Extraction temperature, time and type of microalgae species had significant effect (p &lt; 0.05) on oil yield (temperature &gt; time &gt; type of species).  As extraction temperature and time increased, Desmodesmus armatus gave the optimum oil yield (72.6% at 92.5 oC), whereas, Cosmarium spp. produced the least (45.5% at 91.7 oC). Optimal oil yield and temperatures of Desmodesmus subspicatus, Chlorella lewinii and Dictyosphaerium spp. were  68.2% and 92.5 oC; 72.3% and 91.9 oC; and 66.7% and 92.5 oC respectively. The optimization result showed that oil extraction from microalgae should be conducted at about 80 oC and at the first 30 minutes of heating for oil extraction. These findings reduce extraction wastages of time, cost, energy, resources and chemicals.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.cigrjournal.org/index.php/Ejounral/article/view/5247
Editor: | International Commission of Agricultural and Biosystems Engineering
Relação: | http://www.cigrjournal.org/index.php/Ejounral/article/view/5247/3023
Formato: | application/pdf

Fonte:

Agricultural Engineering International: CIGR Journal; Vol 21, No 2 (2019): CIGR Journal; 159-169

1682-1130

Fonte: | Copyright (c) 2019 Agricultural Engineering International: CIGR Journal