Abstract
In this work, a membrane photobioreactor integrating with a flashing light (MFLPBR) has been developed for dense culture of a fast growing and oil-rich benthic diatom mutant Nitzschia sp. L8. Under 45 μmol/m2/s light intensity, 0.5 Hz flashing light (FL) could obviously improve the photosynthetic activity, specific growth rate and biomass yield of L8, with the increments by 18.5 %, 32.2 % and 137.6 % comparing to the continuous illumination culture. The total lipid content of L8 reached up to 53.5 % of dry weight, indicating a diversion of carbon flow from carbohydrates to lipids, resulting in increased biomass and lipid accumulation under FL. When L8 was subject to attached growth on the membrane surface in MFLPBR, cell growth was further improved, reaching the biomass yield and lipid productivity of 0.423 g/L and 30.35 mg/L/d in MFLPBR. The MFLPBR was proved to be a feasible strategy to promote the growth of benthic diatom for biomass and lipid production.
Published Version
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