Study of increasing lipid production from fresh water microalgae Chlorella vulgaris

Widjaja, Arief; Chien, Chao-Chang; Ju, Yi‐Hsu

doi:10.1016/j.jtice.2008.07.007

Cited by 515 publications

(272 citation statements)

References 42 publications

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“…Compared to other studies on freshwater C. vulgaris, this lipid productivity is approximately 10.8 times and 5.8 times that of (Illman et al 2000) under controlled medium and low-N medium, respectively, and superior to Widjaja et al (2009) and Yeh et al (2010) (Table 2). The maximum lipid content (45.68 %) obtained in this study is also the highest comparing to 18 and 40 % of (Illman et al 2000), 29.53 % of (Widjaja et al 2009) and 30-40 % of (Yeh et al 2010). Nitrogen is usually the important limiting nutrient for most microorganisms.…”

Section: Comparison With Other Investigatorscontrasting

confidence: 50%

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: Comparison With Other Investigatorscontrasting

confidence: 50%

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

Huang

2013

Int. J. Environ. Sci. Technol.

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“…The maximum values of total lipid productivity are higher than most of the reported in the literature (Table 1), and the trend in increasing lipid productivity under nitrogen limitation confirms the trends observed previously. [33][34][35] Lipid productivity in continuous culture was 0.276 g L -1 d -1 via a closed loop (increase of 31.5 %) over that of the continuous mode in open loop and 81.1 % in batch mode (Fig. 4).…”

Section: Resultsmentioning

confidence: 97%

Increasing of the Lipid Productivity Concentration in a Class of Continuous Culture via Dynamic Analysis and Closed-Loop Operation

López‐Pérez

Caballero²,

Ruiz-Camacho³

et al. 2017

ECB

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Good process control has often been criticized for the economic viability of large-scale production of several commercial products. In this work, the production of biodiesel from microalgae is investigated. Successful implementation of a model-based control strategy requires the identification of a model that properly captures the biochemical dynamics of microalgae, yet is simple enough to allow its implementation for controller design. This paper explores the biodiesel production in a class of continuous culture under heterotrophic conditions via closed-loop operation. A mathematical model adapted from Surisetty et al. (2010) that describe the growth of microalgae in a heterotrophic culture is studied via dynamic analysis. This model is extended to the continuous operation where bifurcation analysis was carried out for the determinate the qualitative model behavior and to analyze feasible operating conditions. This project is focused on the on the use of a mixture of two substrates that are continuously fed into the reactor chamber, and the continuous fermentation process is described by an unstructured mathematical model with a product inhibition on cell growth. In addition, we present the design of a nonlinear control law contains a class of bounded type feedback of the named control error in order to regulate the substrate concentration at maximum value to lead the lipids-diesel concentration indirectly. Lipid productivity in continuous culture was 0.276 g L -1 d -1 via a closed loop (increase of 31.5 %) over that of the continuous mode in open loop. Finally, numerical experiments proved the satisfactory performance of the proposed methodology in comparison with a linear PI controller.

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“…The microalgae was further dried with a MB 45 Moisture Analyzer (Ohaus, USA) at 60˚C until a constant mass. Drying was performed at 60˚C to preserve the biochemical compositions of the samples [9]. The moisture content of the resulting microalgae was taken as reference point, 0% (w/w) dry algae.…”

Section: Total Lipid Contentmentioning

confidence: 99%

Effect of Soaking Pre-Treatment on Reactive Extraction/<i>in situ</i> Transesterification of <i>Nannochloropsis occulata</i> for Biodiesel Production

Salam¹,

Velásquez-Orta²,

Harvey³

2017

JSBS

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Microalgal phospholipid bilayer contributes to the molar excesses of methanol and high acid concentration required in reactive extraction to achieve high fatty acid methyl ester (FAME) yield. This study reports an investigation into the effects of pre-soaking Nannochloropsis occulata in methanol at 600:1 and 1000:1 methanol to oil molar ratios prior to acid-catalyzed in situ transesterification at 8.5:1 and 15:1 H 2 SO 4 to oil molar ratios on the FAME yield. The results showed that the pre-soaked Nannochloropsis occulata produced a higher FAME yield at the two tested methanol to oil molar ratios and acid concentrations than the un-soaked, resulting in a reduction in methanol volume and acid concentration. A maximum FAME yield of 98.4% ± 1.3% was obtained for the pre-soaked Nannochloropsis occulata at 1000:1 methanol to oil molar ratio and 15:1 H 2 SO 4 to oil molar ratio. Both the phosphorus mass balance and conversion of the isolated phospholipids into FAME revealed that pre-soaking solubilizes the phospholipid bilayer to some degree, and contributes to an increased FAME yield.

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Study of increasing lipid production from fresh water microalgae Chlorella vulgaris

Cited by 515 publications

References 42 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

Increasing of the Lipid Productivity Concentration in a Class of Continuous Culture via Dynamic Analysis and Closed-Loop Operation

Effect of Soaking Pre-Treatment on Reactive Extraction/<i>in situ</i> Transesterification of <i>Nannochloropsis occulata</i> for Biodiesel Production

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Study of increasing lipid production from fresh water microalgae Chlorella vulgaris

Cited by 515 publications

References 42 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

Increasing of the Lipid Productivity Concentration in a Class of Continuous Culture via Dynamic Analysis and Closed-Loop Operation

Effect of Soaking Pre-Treatment on Reactive Extraction/&lt;i&gt;in situ&lt;/i&gt; Transesterification of &lt;i&gt;Nannochloropsis occulata&lt;/i&gt; for Biodiesel Production

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Effect of Soaking Pre-Treatment on Reactive Extraction/<i>in situ</i> Transesterification of <i>Nannochloropsis occulata</i> for Biodiesel Production