Journal
BIOTECHNOLOGY AND BIOENGINEERING
Volume 91, Issue 5, Pages 569-582Publisher
WILEY
DOI: 10.1002/bit.20475
Keywords
light transfer; predictive model; photobioreactor; Chlamydomonas reinhardtii; two-flux method; optical radiative properties
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The light attenuation in a photobioreactor is determined using a fully predictive model. The optical properties were first calculated, using a data bank of the literature, from only the knowledge of pigments content, shape, and size distributions of cultivated cells which are a function of the physiology of the current species. The radiative properties of the biological turbid medium were then deduced using the exact Lorenz-Mie theory. This method is experimentally validated using a large-size integrating sphere photometer. The radiative properties are then used in a rectangular, one-dimensional two-flux model to predict radiant light attenuation in a photobioreactor, considering a quasi-collimated field of irradiance. Combination of this radiative model with the predictive determination of optical properties is finally validated by in situ measurement of attenuation profiles in a torus photobioreactor cultivating the microalgae Chlamydomonas reinhardtii, after a complete and proper characterization of the incident light flux provided by the experimental set-up. (C) 2005 Wiley Periodicals, Inc.
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