Abstract
This investigation examined the effects of ferric ion source and concentration on the biomass yield, fatty acid methyl esters (FAME) productivity and composition from Scenedesmus rubescens-like microalga. The algae cultivated with Fe2+–SO42-/EDTA had higher ash free dry biomass (AFDB) production and in vivo chlorophyll a concentration than those with Fe2+–SO42- and Fe3+–Cl− (P<0.001). The high or low Fe2+ concentration can partly restrict the ammonia consumption, the AFDB and FAME accumulation. The algae at 1mg/L Fe2+ concentration had the highest AFDB and FAME productivity (341.1±25.8 and 107.8±19.3mg/L/d) (P<0.001). The mean content of C16 and C18 series at all Fe2+ concentrations was 88.6%±2.9% of total FAME, and it decreased with the increase of Fe2+ concentrations. Among the fatty acids profiles, the contents of C18: 0, C18: 1n−7 and C18: 1n−9 are significantly changed under the different Fe2+ concentrations, but not the contents of C16 series.
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