Reduction of CO2 by a high-density culture of Chlorella sp. in a semicontinuous photobioreactor

Chiu, Sheng Yi; Kao, Chien Ya; Chen, Chiun-Hsun; Kuan, Tang Ching; Ong, Seow Chin; Lin, Chih‐Sheng

doi:10.1016/j.biortech.2007.08.013

Cited by 577 publications

(233 citation statements)

References 21 publications

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“…Figure 3 shows that C. vulgaris can grow in 15, 30, and 50 % of CO 2 , indicating the possibility of using flue gas as a carbon source. Although the previous research indicates that a high CO 2 concentration (e.g., 10 %, Chiu et al 2008) inhibits the growth of C. vulgaris, the results obtained in the current study show that C. vulgaris can grow well in CO 2 concentrations ranging from 15 to 50 %. Furthermore, analysis of variance (ANOVA) results indicate that pH, light intensity, and CO 2 concentration were significant factors affecting the dry weight, with a p value less than 0.01.…”

Section: Discussioncontrasting

confidence: 97%

“…First, this particular strain of C. vulgaris has an amazing tolerance toward CO 2 (up to 50 %) compared to the results of Chiu et al (2008), who showed that the growth of Chlorella is limited by a CO 2 concentration exceeding 2 %. Furthermore, the lipid content reached its highest value at 30 % CO 2 , whereas Lv et al (2010) showed that lipid content decreased if the CO 2 concentration exceeded 1 %.…”

Section: Comparison With Other Investigatorsmentioning

confidence: 76%

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High lipid content and productivity of microalgae cultivating under elevated carbon dioxide

Huang

2013

Int. J. Environ. Sci. Technol.

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This study examined the cell growth rate, lipid contents, lipid productivity, chlorophyll a concentration, and carbon dioxide tolerance of Chlorella vulgaris under various cultivation conditions. The pH, concentration of carbon dioxide in media, and light intensity variables were manipulated to obtain high lipid productivity. The optimum conditions were at pH 7.0, 2,930 lux, and 30 % carbon dioxide. Biomass concentration reached 1,288, 1,130, and 1,083 mg L -1 at 15, 30, and 50 % CO 2 after 6 days, respectively, implying that this strain has appreciable tolerance to carbon dioxide. The highest concentration of chlorophyll a occurred at 2,930 lux and decreased with increasing light intensity gradually. The maximum specific growth rate was 3.25 day -1 based on the dry weight and 4.63 day -1 based on the cell number. The lipid content (45.68 %) and lipid productivity (86.03 mg day -1 L -1 ) obtained in this study are higher than reported values in literatures. Hence, C. vulgaris is a good candidate for subsequent research in biodiesel production under elevated carbon dioxide concentration by microalgae.

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Section: Discussioncontrasting

confidence: 97%

Section: Comparison With Other Investigatorsmentioning

confidence: 76%

High lipid content and productivity of microalgae cultivating under elevated carbon dioxide

Huang

2013

Int. J. Environ. Sci. Technol.

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“…Deste modo, uma maior quantidade de células é capaz de captar energia luminosa, excitando pigmentos fotossintéticos e produzindo, consequentemente, maior quantidade de biomassa microalgal. Nos biorreatores dos tipos erlenmeyer e raceway, o fenômeno de sombreamento pode ter ocorrido nos ensaios, devido à área reduzida do cultivo exposta à luz, diminuindo-se a atividade fotossintética e, consequentemente, a produtividade de biomassa nos cultivos (Alabi et al, 2009 Estudos anteriores mostraram que concentrações superiores a 5% (v/v) de CO 2 foram prejudiciais aos cultivos de microalgas, inibindo seu crescimento celular (Chiu et al, 2008;Ho et al, 2010;Yoo et al, 2010). Porém, para Spirulina sp.…”

Section: Resultsunclassified

BIOFIXAÇÃO DE CO2 POR Spirulina sp. LEB 18 CULTIVADA EM DIFERENTES BIORREATORES

Duarte¹,

Morais²,

Vaz³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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(um espaço) RESUMO -A biofixação de CO 2 por microalgas é uma tecnologia baseada na fotossíntese, para obtenção de carbono orgânico, gerando biomassa aplicável na produção de diversos bioprodutos. O objetivo do trabalho foi avaliar parâmetros cinéticos do cultivo, bem como a biofixação de CO 2 por Spirulina sp. LEB 18 em biorreatores dos tipos erlenmeyer, raceway e tubular, utilizando-se como fonte de carbono CO 2 comercial. A microalga foi cultivada em meio Zarrouk, com substituição da fonte de carbono por 10% (v/v) de CO 2 , nos diferentes biorreatores. Os máximos valores de concentração celular 1,60 g. L -1 e taxa de biofixação (274,5 mg. L -1 .d -1 ) foram obtidos nos cultivos em biorreator tubular, substituindo-se a fonte de carbono original do meio de cultivo por 10% (v/v) de CO 2 comercial. O uso de fontes alternativas para o cultivo de microalgas, como CO 2 , pode reduzir custos de produção da biomassa, além de contribuir com a redução da emissão de efluentes gasosos para a atmosfera. INTRODUÇÃOO aquecimento global, induzido pela elevada concentração de gases de efeito estufa (GEE) na atmosfera, tem sido tema de grande preocupação. Projeções indicam que, em 2030, a concentração de CO 2 atmosférico poderá alcançar 55% das emissões registradas no ano de 2004. Diante disso, tecnologias vêm sendo aplicadas a fim de promover a mitigação destes gases poluentes. O planeta Terra possui cerca de 70% de água, sendo que 97% dessa encontram-se nos oceanos. Nos oceanos, é onde ocorre cerca de 50% da fixação do CO 2 devido às microalgas (Ohse et al., 2007).Em relação à capacidade fotossintética, as microalgas são mais eficientes que as plantas vasculares e podem ser produzidas em meios de cultivos relativamente simples e em larga escala (Scragg et al., 2002). Atributos desejáveis para a fixação de CO 2 incluem altas taxas de crescimento, tolerância a constituintes dos gases de combustão, tais como SO X , NO X , materiais particulados e possibilidade de produção de bioprodutos, como biodiesel e bioetanol, Facilidade de colheita, associados à sedimentação espontânea ou características de biofloculação, tolerância a altas Área temática: Processos Biotecnológicos 1

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“…The optimal CO 2 concentration for most microalgal species is usually recommended to be 0.038-10%, for example, the maximum biomass production was observed at 2.5% CO 2 for microalgae Chlorella sp. (Chiu et al, 2008) and at 6% for Scenedesmus obliquus and Chlorella kessleri (de Morais and Costa, 2007b).…”

Section: Co 2 Sourcementioning

confidence: 99%

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

Klinthong

Yang

Huang

et al. 2015

Aerosol Air Qual. Res.

209

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Fossil fuels, which are recognized as unsustainable sources of energy, are continuously consumed and decreased with increasing fuel demands. Microalgae have great potential as renewable fuel sources because they possess rapid growth rate and the ability to store high-quality lipids and carbohydrates inside their cells for biofuel production. Microalgae can be cultivated on opened or closed systems and require nutrients and CO 2 that may be supplied from wastewater and fossil fuel combustion. In addition, CO 2 capture via photosynthesis to directly fix carbon into microalgae has also attracted the attention of researchers. The conversion of CO 2 into chemical and fuel (energy) products without pollution via this approach is a promising way to not only reduce CO 2 emissions but also generate more economic value. The harvested microalgal biomass can be converted into biofuel products, such as biohydrogen, biodiesel, biomethanol, bioethanol, biobutanol and biohydrocarbons. Thus, microalgal cultivation can contribute to CO 2 fixation and can be a source of biofuels. This article reviews the literature on microalgae that were cultivated using captured CO 2 , technologies related to the production of biofuels from microalgae and the possible commercialization of microalgae-based biofuels to demonstrate the potential of microalgae. In this respect, a number of relevant topics are addressed: the nature of microalgae (e.g., species and composition); CO 2 capture via microalgae; the techniques for microalgal cultivation, harvesting and pretreatment; and the techniques for lipid extraction and biofuel production. The strategies for biofuel commercialization are proposed as well.

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Reduction of CO2 by a high-density culture of Chlorella sp. in a semicontinuous photobioreactor

Cited by 577 publications

References 21 publications

High lipid content and productivity of microalgae cultivating under elevated carbon dioxide

High lipid content and productivity of microalgae cultivating under elevated carbon dioxide

BIOFIXAÇÃO DE CO2 POR Spirulina sp. LEB 18 CULTIVADA EM DIFERENTES BIORREATORES

A Review: Microalgae and Their Applications in CO2 Capture and Renewable Energy

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