Growth yield determination in a chemostat culture of the marine microalgaIsochrysis galbana |
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Authors: | E Molina Grima F García Camacho J A Sánchez Pérez F G Acién Fernández J M Fernández Sevilla |
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Affiliation: | (1) Departamento de Ingeniería Química, Facultad de Ciencias Experimentales, Universidad de Almería, Spain |
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Abstract: | The growth yield of the PUFA-producing marine microalgaIsochrysis galbana ALII-4 grown in a light limited chemostat, was measured under a wide variety of conditions of incident irradiance (I
O
) and dilution rates (D). The experiments were conducted under laboratory conditions at 20 °C under continuous light. D ranged from 0.0024 to 0.0410 h–1 at three intensities of Io (820, 1620 and 3270 µmol photon m–2 s–1) close to those found in outdoor cultures. A maximum efficiency
max
= 0.616 g mol photon–1 was obtained at I
O
= 820 µmol photon m–2 s–1 and D = 0.030 h–1 and the maximum capacity of the biomass to metabolize the light harvested was found to be 13.1 µmol photon g–1 s–1. Above this value, a significant drop in the system efficiency was observed. A new approach based in the averaged irradiance is used to assess the photon flux absorbed by the biomass. |
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Keywords: | Quantum yield average irradiance light absorption photobioreactor photosynthetic efficiency |
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