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Cultivation of Microalgae Chlorella vulgaris in Open Reactor for Bioethanol Production

Authors :
Graziella Silva
Keilla Cerqueira
Jacqueline Rodrigues
Karollyna Silva
Diego Coelho
Roberto Souza
Source :
Phycology, Vol 3, Iss 2, Pp 325-336 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

Microalgae have a high growth rate, high CO2 absorption capacity, and high content of chlorophyll, proteins, vitamins, mineral salts, carbohydrates, antioxidant substances, and fatty acids. In recent years, Chlorella vulgaris has been widely used as a feedstock for producing third-generation biofuels, such as bioethanol. Thus, this work aims to develop a strategy to increase the production scale of the microalgae Chlorella vulgaris grown in distilled reused water, supplemented with a modified BG-11 medium, to use biomass in the production of bioethanol. The total cultivation of 72 L presented a concentration of 0.415 g·L−1·d−1, with 61.32 g of final biomass. To improve carbohydrate extraction, the biomass was pre-treated with sulfuric acid at different concentrations (1.5% and 3% v/v). The hydrolyzed solution was supplemented with YPD (yeast extract peptone dextrose) medium and inoculated with Saccharomyces cerevisae yeast, initiating fermentation. In each sample, the Brix degree, cell concentration, reducing sugar concentration, and alcohol content were analyzed. The sample pre-treated with sulfuric acid 1.5% v/v was the one that presented the best result, with alcohol content after distillation of 68 °GL (Gay-Lussac). It appears that the cultivation of the microalgae Chlorella vulgaris in scale-up, with reused water, has high potential in the production of third-generation biofuel.

Details

Language :
English
ISSN :
26739410
Volume :
3
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Phycology
Publication Type :
Academic Journal
Accession number :
edsdoj.bba4cf107ec54c9f9f5d9a98c51de0b1
Document Type :
article
Full Text :
https://doi.org/10.3390/phycology3020021