Enhanced lipidic algae biomass production using gas transfer from a fermentative Rhodosporidium toruloides culture to an autotrophic Chlorella protothecoides

Santos, Carla A.; Caldeira, M. L.; Silva, Teresa Lopes da; Novais, J. M.; Reis, Alberto

http://hdl.handle.net/10400.9/2452

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Authors

Santos, Carla A.

Caldeira, M. L.

Silva, Teresa Lopes da

Novais, J. M.

Reis, Alberto

Abstract(s)

In order to produce single-cell oil for biodiesel, a yeast and a microalga were, for the first time, grown in two separate reactors connected by their gas-phases, taking advantage of their complementary nutritional metabolisms, i.e., respiration and photosynthesis. The yeast Rhodosporidium toruloides was used for lipid production, originating a carbon dioxideenriched outlet gas stream which in turn was used to stimulate the autotrophic growth of Chlorella protothecoides in a vertical-alveolar-panel (VAP) photobioreactor. The microalgal biomass productivity was 0.015 g L1 h1, and its lipid productivity attained 2.2 mg L1- h1 when aerated with the outlet gas stream from the yeast fermenter. These values represent an increase of 94% and 87%, respectively, as compared to a control culture aerated with air. The CO2 bio-fixed by the microalgal biomass reached an estimated value of 29 mg L1 h1 in the VAP receiving the gas stream from the fermenter, a value 1.9 times higher than that measured in the control VAP.

Keywords

Microalga Yeasts Lipids Biodiesel Carbon dioxide fixation

URI

http://hdl.handle.net/10400.9/2452

Citation

Santos, C.A.; Caldeira, .L.; Silva, T. Lopes da; Novais, J.M.; Reis, A. Enhanced lipidic algae biomass production using gas transfer from a fermentative Rhodosporidium toruloides culture to an autotrophic Chlorella protothecoides. In: Bioresource Technology, 2013, Vol. 138, p. 48-54