Since microalgae have a high photosynthetic capability, solar energy-driven CO 2 fixation technologies using microalgae have the potential to convert CO 2 in the stack gas from a thermal power station into energy-rich biomass. We investigated a new design of photobioreator in order to achieve efficient photosynthetic performance. The system has several advantages over the conventional mass culture system of microalgae. We have investigated the energy and material balances of microalgal biomass production in a photobioreactor system both theoretically and experimentally. CO 2 conversion to microalgal biomass in the laboratory scale conical-shaped helical tubular photobioreactor incorporating Spirulina platensis was investigated. The photobioreactor system was constructed with a basal area of 0.255 m 2 .The total volume of photostage was 6.23 litre with 0.651 m 2 light absorbing area ( inner surface of cone). The photostage was illuminated with cool white fluorescent lamps, the daily energy input of the photosynthetic active radiation (PAR, 400-700nm) into the photobioreactor was 1249 kJ. The productivity of Spirulina platensis of this photobioreactor was 15.9 g dry biomass per m 2 (basal area) per day,or 0.51 g dry biomass litre -1 day -1 . This corresponded to a photosynthetic efficiency of 6.83 % (PAR). According to these results, a large scale microalgal production using a unit basic type photobioreactor (1 m 2 basal area) is discussed.
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