Abstract
The effect of biomass concentration on the net volumetric productivity, yield on light and nightly biomass loss rate of Tetraselmis suecica was studied using a pilot-scale tubular photobioreactor (PBR) under outdoor light conditions. The net average productivity and yield on light of Tetraselmis suecica were optimal at a biomass concentration of 0.7gL−1. Cultures grown at higher biomass concentrations showed a prolonged respiration period at low light periods, while light was wasted in more dilute cultures at high light intensities. At optimal biomass concentration of 0.7gL−1 the highest average net productivity and yield on light were 0.35±0.03gL−1 d−1 and 1.19±0.15gmol−1, respectively. The highest nightly biomass loss rate was measured for Tetraselmis suecica grown at an optimal biomass concentration, which can be explained by higher maintenance costs of the microalgae with a higher growth rate.This study shows that the productivity and yield on light can be enhanced by optimizing the biomass concentration.
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