期刊
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
卷 60, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.algal.2021.102513
关键词
Photoinhibition; Biomass yield on substrate; Oxygen balance; High density; Acidophilic microalgae
The study showed that Galdieria sulphuraria can be cultivated with high productivity in an environment with pH 1.7 and organic carbon, and that biomass productivity is higher in mixotrophic cultivation compared to autotrophic cultivation. Mixotrophy allows for efficient recycling of oxygen and CO2 within the cells, leading to less waste of substrate carbon.
Galdieria sulphuraria is an acidophilic micmalga isolated in proximity of sulfuric ponds where pH is below 3 and most organisms cannot grow. We cultivated G. sulphuraria ACUF 64 free of contamination for over 2 months in a medium containing organic carbon at pH 1.7 with continuous, high intensity, lighting. We compared biomass productivity of chemostat and repeated batch cultivations. The optimal biomass density in autotrophic and mixotrophic cultures was identified. In autotrophy biomass productivity was 28.3 g(x).m(-2) .day(-1), 1.8 to 7.7-fold higher than previously reported. Autotrophy was compared to 'oxygen balanced' mixotrophy where intracellular recirculation of O-2 and CO2 take place. Aeration was not needed and 92% of the substrate carbon was converted into biomass. In mixotmphy biomass productivity was 1.8 times higher than autotrophic culture and linear growth was maintained at high biomass concentration (9.7 g(x).T-1). Light tolerance and high productivity in dense culture make our strain promising for mixotmphic outdoor cultivation.
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