Bioflocculation of the oceanic microalga Dunaliella salina by the bloom-forming dinoflagellate Heterocapsa circularisquama, and its effect on biodiesel properties of the biomass

Cho, Kichul; Hur, Sung‐Pyo; Lee, Chi-Heon; Ko, Kyungjun; Lee, Yeon-Ji; Kim, Kil-Nam; Kim, Moo‐Sang; Chung, Young‐Ho; Kim, Daekyung; Oda, Tatsuya

doi:10.1016/j.biortech.2015.12.047

Cited by 27 publications

(13 citation statements)

References 17 publications

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“…This FAME profile is more similar to that found by El Arroussi et al [24] than to that of the present work. Again, the cultivation medium used by Cho et al [25] was similar to the report in this work, differing mainly in the use of sodium acetate as carbon source. These results support the conclusion that sodium acetate has a positive effect on the FAME profile of D. salina oil.…”

Section: Resultssupporting

confidence: 54%

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Nannochloropsis gaditana and Dunaliella salina as Feedstock for Biodiesel Production: Lipid Production and Biofuel Quality

Bredda

Rós

Pedro

et al. 2019

JABB

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Introduction: Microalgal lipids have a wide range of applications, from biodiesel manufacture in the energy industry to the production of polyunsaturated fatty acids for the pharmaceutical industry. Microalgal lipid productivity and quality, however, vary greatly depending on cultivation parameters. Aims: In this study, we investigated the potential of two marine microalgae, Nannochloropsis gaditana and Dunaliella salina, to be used as feedstock for biodiesel production. Methodology: A Taguchi L4 orthogonal array design was applied to understand the effects of sodium acetate (0 or 2 g L−1), sodium bicarbonate (0 or 2 g L−1), and sodium nitrate (25 or 75 mg L−1) concentrations on biomass and lipid productivities. Fatty acid methyl ester (FAME) profiles of microalgal lipids obtained under the best conditions were determined, and FAME results were used to predict biodiesel properties. Results: Both carbon sources (sodium acetate and sodium bicarbonate) improved biomass productivity. Lipid productivity was enhanced only by sodium acetate. The highest lipid productivities obtained were 10.25 ± 1.02 and 12.12 ± 0.28 mg L−1 day−1 for N. gaditana and D. salina, respectively. Palmitic (C16:0), stearic (C18:1), oleic (C18:1), linoleic (C18:2), lauric (C12:0), and myristic (C14:0) acids were the major components of D. salina oil. The major fatty acids in N. gaditana oil were C16:0, C18:0, and C18:1. Conclusion: The great differences in FAME profiles resulted in different biodiesel properties. Biodiesel from N. gaditana oil was predicted to have a higher cetane number (73.20) than that derived from D. salina oil (59.59). D. salina oil biodiesel, however, was predicted to have better properties than N. gaditana oil biodiesel, including lower cloud point (0.46°C) and cold filter plugging point (−7.27°C).

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Section: Resultssupporting

confidence: 54%

“…Cho et al [25] studied the effect of oxidative stress on biomass and lipid production by D. salina exposed to phenols. The major FAME components of the oil produced by control microalgae (without phenol exposure) were C16:0 (19.63%), C18:1 (1.60%), and C18:3 (45.58%).…”

Section: Resultsmentioning

confidence: 99%

Nannochloropsis gaditana and Dunaliella salina as Feedstock for Biodiesel Production: Lipid Production and Biofuel Quality

Bredda

Rós

Pedro

et al. 2019

JABB

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“…The growth rate of D. salina was optimal at this laboratory conditions using a salinity of 3.5% (w/v), as expected [51], and has also been demonstrated to be a very suitable microalgae for biofuel production at large scale [52,53]. Table 1 shows that the Gompertz a value of D. salina was the highest, which can be attributed to a higher displacement along the x-axis, indicating that this species needed more time to start the exponential growth phase.…”

Section: Speciessupporting

confidence: 58%

Modelling of Biomass Concentration, Multi-Wavelength Absorption and Discrimination Method for Seven Important Marine Microalgae Species

2018

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Due to the possible depletion of fossil fuels in the near future and the necessity of finding new food sources for a growing world population, marine microalgae constitutes a very promising alternative resource, which can also contribute to carbon dioxide fixation. Thus, seven species (Chaetoceros calcitrans, Chaetoceros gracilis, Isochrysis galbana, Nannochloropsis gaditana, Dunaliella salina, Tetraselmis suecica, and Tetraselmis chuii) were grown in five serial batch cultures at a bench scale under continuous illumination. The batch cultures were inoculated with an aliquot that was extracted from a larger-scale culture in order to obtain growth data valid for the entire growth cycle with guaranteed reproducibility. Thus, measurements of optical density at several wavelengths and cell counting with a haemocytometer (Neubauer chamber) were performed every one or two days for 22 days in the five batch cultures of each specie. Modeling of cell growth, the relationship between optical density (OD) and cell concentration and the effect of wavelength on OD was performed. The results of this study showed the highest and lowest growth rate for N. gaditana and T. suecica, respectively. Furthermore, a simple and accurate discrimination method by performing direct single OD measurements of microalgae culture aliquots was developed and is already available for free on internet.

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“…Microalgae dewatering costs could be greatly reduced with bioflocculation, because no chemical costs are incurred with little energy consumption [15,16]. The dewatering of microalgae with bioflocculation, using bacteria as a flocculating agent which is cultivated alongside the microalgae, presents the setback of microbiological contamination and possible interference with food or pharmaceutical applications [17,18]. Ndikubwimana et al reported increased flocculation efficiency from 44.8 ± 0.1% to 96.0 ± 0.3% after 10 min [19].…”

Section: Introductionmentioning

confidence: 99%

Optimisation of Tray Drier Microalgae Dewatering Techniques Using Response Surface Methodology

et al. 2018

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The feasibility of the application of a tray drier in dewatering microalgae was investigated. Response surface methodology (RSM) based on Central Composite Design (CCD) was used to evaluate and optimise the effect of air temperature and air velocity as independent variables on the dewatering efficiency as a response function. The significance of independent variables and their interactions was tested by means of analysis of variance (ANOVA) with a 95% confidence level. Results indicate that the air supply temperature was the main parameter affecting dewatering efficiency, while air velocity had a slight effect on the process. The optimum operating conditions to achieve maximum dewatering were determined: air velocities and temperatures ranged between 4 to 10 m/s and 40 to 56 °C respectively. An optimised dewatering efficiency of 92.83% was achieved at air an velocity of 4 m/s and air temperature of 48 °C. Energy used per 1 kg of dry algae was 0.34 kWh.

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Bioflocculation of the oceanic microalga Dunaliella salina by the bloom-forming dinoflagellate Heterocapsa circularisquama, and its effect on biodiesel properties of the biomass

Cited by 27 publications

References 17 publications

Nannochloropsis gaditana and Dunaliella salina as Feedstock for Biodiesel Production: Lipid Production and Biofuel Quality

Nannochloropsis gaditana and Dunaliella salina as Feedstock for Biodiesel Production: Lipid Production and Biofuel Quality

Modelling of Biomass Concentration, Multi-Wavelength Absorption and Discrimination Method for Seven Important Marine Microalgae Species

Optimisation of Tray Drier Microalgae Dewatering Techniques Using Response Surface Methodology

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