Abstract
Microalgal strains of the genus Scenedesmus are a promising resource for commercial biotechnological applications. The temperature-, pH- and light-dependent growth of Scenedesmus ovalternus has been investigated on a laboratory scale. Best batch process performance was obtained at 30°C, pH 8.0 and an incident photon flux density of 1300μmolphotonsm−2s−1 using a flat-plate gas-lift photobioreactor. Highest growth rate (0.11h−1) and space-time yield (1.7±0.1gCDWL−1d−1) were observed when applying these reaction conditions. Biomass concentrations of up to 7.5±0.1gCDWL−1 were achieved within six days (25.0±0.5gCDWm−2d−1). The light-dependent growth kinetics of S. ovalternus was identified using Schuster’s light transfer model and Andrews’ light inhibition model (KS=545μmolphotonsm−2s−1; KI=2744μmolphotonsm−2s−1; μmax=0.21h−1). The optimal mean integral photon flux density for growth of S. ovalternus was estimated to be 1223μmolphotonsm−2s−1.
Published Version
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