Single cell protein production of Euglena gracilis and carbon dioxide fixation in an innovative photo-bioreactor

Chae, So-Ryong; Hwang, Eung-Ju; Shin, Hyungcheol

doi:10.1016/j.biortech.2005.02.037

Cited by 178 publications

(61 citation statements)

References 8 publications

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“…Similar results were obtained by Yue and Chen [14] and Hsueh et al [15] in the photosynthetic cultivation of the microalgae Chlorella ZY-1 and Nannochlopsis oculta, obtaining positive growth rates in residence times below 120 h. Table 2 shows the growth kinetics of Aphanothece microscopica Nägeli. An analysis of these results shows that the maximum specific growth rates were obtained at 35 • C, 9 klux and 15% The maximum values obtained for μ max were similar to those obtained by other authors for the species Euglena gracilis and Anabaena variabilis, cultivated using photosynthetic metabolism [16,17]. However the maximum concentration of carbon dioxide enrichment used for these cultures was 13% (v/v), suggesting that the Aphanothece microscopica Nägeli is more tolerant to gases enriched with high levels of CO 2 , since high growth rates were obtained with up to 62% (v/v) of carbon dioxide.…”

Section: Conditionsupporting

confidence: 88%

Biomass production and carbon dioxide fixation by Aphanothece microscopica Nägeli in a bubble column photobioreactor

Jacob‐Lopes

Lacerda

Franco

2008

Biochemical Engineering Journal

101

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The objective of the present study was to evaluate the growth kinetics of Aphanothece microscopica Nägeli under different conditions of temperature, light intensity and CO 2 concentration. The growth kinetics of the microorganism and carbon biofixation were evaluated using a central composite design, considering five different temperature levels (21.5, 25, 30, 35 and 38.5 • C), light intensities (0.96, 3, 6, 9 and 11 klux) and carbon dioxide concentrations (3, 15, 25, 50 and 62%). The results obtained showed the effects of temperature, light intensity and CO 2 concentration (p < 0.05) on the photosynthetic metabolism of the microorganism. Response surface methodology was adequate for process optimisation, providing a carbon fixation rate to the order of 109.2 mg L −1 h −1 under conditions of 11 klux, 35• C and 15% carbon dioxide, representing an increase of 58.1% as compared to the conditions tested initially.

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Section: Conditionsupporting

confidence: 88%

Biomass production and carbon dioxide fixation by Aphanothece microscopica Nägeli in a bubble column photobioreactor

Jacob‐Lopes

Lacerda

Franco

2008

Biochemical Engineering Journal

101

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“…and SO x components (Michiki, 1995;Chae et al, 2006). Olaizola (2003) showed that the 449 main effect of SO x and NO x is indirect due to their acidity since they lead to a drop in pH.…”

Section: Codigestion 386mentioning

confidence: 99%

Anaerobic digestion of microalgae as a necessary step to make microalgal biodiesel sustainable

Sialve¹,

Bernet²,

Bernard³

2009

Biotechnology Advances

1,026

543

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“…The low percentage of CO 2 in the air (0.033%) will quickly limit the growth if, supplementary carbon is not supplied as roughly 45-50% of algal biomass is made of carbon (Doucha et al 2005;Chae et al 2006). This CO 2 is generally blended with air in aerated cultures or injected into the algal cultures via gas exchange vessels in photobioreactors or sumps in open raceways.…”

Section: Gas Exchangementioning

confidence: 99%

Microalgae as second generation biofuel. A review

Singh¹,

Dhar²

2011

Agron. Sustain. Dev.

152

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Microalgae are autotrophic microorganisms having extremely high photosynthetic efficiency and are valued as rich source of lipids, hydrocarbons, and other complex oils for biodiesel besides being an invaluable source of bioethanol, biomethane, and biohydrogen. Biodiesel produced from oilseed crops such as jatropha and soy have lower yields per unit land area and threaten food security. Indeed, microalgae have higher oil yields amounting to about 40 times more oil per unit area of land in comparison to terrestrial oilseed crops such as soy and canola. Further, microalgae production does not require arable land for cultivation. Biofuel is regarded as a proven clean energy source and several entrepreneurs are attempting to commercialize this renewable source. Technology for producing and using biofuel has been known for several years and is frequently modified and upgraded. In view of this, a review is presented on microalgae as second generation biofuel. Microalgal farming for biomass production is the biggest challenge and opportunity for the biofuel industry. These are considered to be more efficient in converting solar energy into chemical energy and are amongst the most efficient photosynthetic plants on earth. Microalgae have simple cellular structure, a lipid-rich composition, and a rapid rate of reproduction. Many microalgal strains can be grown in saltwater and other harsh conditions. Some autotrophic microalgae can also be converted to heterotrophic ones to accumulate high quality oils using organic carbon. However, there are several technical challenges that need to be addressed to make microalgal biofuel profitable. The efficiency of microalgal biomass production is highly influenced by environmental conditions, e.g., light of proper intensity and wavelength, temperature, CO 2 concentration, nutrient composition, salinities and mixing conditions, and by the choice of cultivation systems: open versus closed pond systems, photobioreactors. Currently, microalgae for commercial purpose are grown mostly in open circular/elongated "raceway" ponds which generally have low yields and high production costs. However, a hybrid system combining closed photobioreactor and open pond is a better option. The biggest hurdle in commercialization of microalgal biofuel is the high cost and energy requirement for the microalgal biomass production, particularly agitation, harvesting, and drying of biomass. In order to conserve energy and reduce costs, algae are often harvested in a two-step process involving flocculation followed by centrifugation, filtration, or micro-straining to get a solid concentration. However, the major bottlenecks in algal biodiesel production within the cell can be identified and handled by adopting a system approach involving transcriptomics, proteomics, and metabolomics. Research and developments in the field of new materials and advanced designs for cultivation in closed bioreactors, use of waste water for biomass production, screening of efficient strains, high-value coproduct strategy,...

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Single cell protein production of Euglena gracilis and carbon dioxide fixation in an innovative photo-bioreactor

Cited by 178 publications

References 8 publications

Biomass production and carbon dioxide fixation by Aphanothece microscopica Nägeli in a bubble column photobioreactor

Biomass production and carbon dioxide fixation by Aphanothece microscopica Nägeli in a bubble column photobioreactor

Anaerobic digestion of microalgae as a necessary step to make microalgal biodiesel sustainable

Microalgae as second generation biofuel. A review

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