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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Potential of algal biofuel production in a hybrid photobioreactor

Texto completo
Autor(es):
de Jesus, Sergio S. ; Maciel Filho, Rubens
Número total de Autores: 2
Tipo de documento: Artigo Científico
Fonte: Chemical Engineering Science; v. 171, p. 282-292, NOV 2 2017.
Citações Web of Science: 7
Resumo

Hybrid bioreactors are equipment featuring characteristics of pneumatic bioreactors and stirred tanks. The production of lipids and carbohydrates was evaluated in a concentric draft tube stirred airlift photo-bioreactor. Mixotrophic cultivation was carried out using the microalgae Chlorella vulgaris grown in vegetable waste. The response surface methodology was used for the experiment optimization. A central composite rotatable design was used to evaluate the effects of light intensity, CO2 concentration and stirring (independent variables) on the lipid and carbohydrate production. The exponential phase of growth occurred mainly in the first seven days of cultivation, and the stationary phase was achieved under all experimental conditions (occurring between the 9th and 14th day). The increase in cellular concentration was obtained mainly in experiments performed with high light intensity and CO2 concentration. At a rotational speed of 800 rpm, growth was affected due to excessive shearing forces caused by increased turbulence. On the other hand, in the absence or at low CO2 concentrations there was a considerable increase in lipid and carbohydrate production. Through response surfaces, we observed that higher percentages of these metabolites may be obtained without adding CO2 and operating the bioreactor with high light intensity and with rotation speed higher than 800 rpm or at low rotational speeds as well as conventional airlift. From an economic point of view, stirring can cause an increase in power consumption; however, if the bioreactor is operated at low rotational speeds, the difference in power consumption with airlift bioreactors is minimal, while the productivity of lipids and carbohydrates increases, which makes the use of this equipment very attractive. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 10/03764-3 - Projeto e construção de um fotobiorreator airlift agitado para a produção de lipídeos e carboidratos
Beneficiário:Sergio Santos de Jesus
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 10/04903-7 - Projeto e construção de um fotobiorreator airlift agitado para a produção de biodiesel
Beneficiário:Rubens Maciel Filho
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 08/57873-8 - Um processo integrado para produção total de bioetanol e emissão zero de CO2
Beneficiário:Rubens Maciel Filho
Linha de fomento: Auxílio à Pesquisa - Programa BIOEN - Temático