Fecitrate converted from Fe 2 O 3 particles in coal-fired flue gas promoted microalgal biomass and lipid productivities.

In order to reutilize Fe ₂ O ₃ particles in flue gas from coal-fired power plant as a ferrum nutrient for improving microalgae growth, Na-Citrate was proposed to chelate FeCl ₃ derived from Fe ₂ O ₃ and HCl reactions to promote biomass and lipid productivities of Chlorella PY-ZU1. Fe-Citrate gave much higher biomass and lipid productivities than FeCl ₃ , Fe-EDTA, Fe-DTPA and Fe-HEDTA, because organic chelator prevented Fe ³⁺ from depositing, lower stability constant resulted in easier dissociation of ferric chelate, smaller chelate facilitated Fe ²⁺ (reduced from Fe ³⁺ ) transportation through cell membranes. The biomass growth and photosynthetic capacity of Chlorella PY-ZU1 cultivated with Fe-Citrate (converted from Fe ₂ O ₃ particles) medium were similar to those with commercial ferric ammonium citrate medium. The biomass and lipid productivities of Chlorella PY-ZU1 cultivated with 5 mg L ^-1 Fe-Citrate medium were 1.30 and 1.72 times, respectively, higher than those with FeCl ₃ growth medium.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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