Photosynthetic production of the filamentous cyanobacteriumSpirulina platensis in a cone-shaped helical tubular photobioreactor |
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Authors: | Y Watanabe D O Hall |
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Institution: | (1) Department of Biotechnology, Abiko Research Laboratory, Central Research Institute of Electric Power Industry, Abiko 1646, 270-11 Abiko City, Chiba prefecture, Japan;(2) Division of Life Sciences, King's College London, University of London, Campden Hill Road, W8 7AH London, UK |
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Abstract: | The photosynthetic productivity of the filamentous cyanobacteriumSpirulina platensis was investigated in a cone-shaped helical tubular photobioreactor. A laboratory-scale photobioreactor was constructed with a 0.255-m2 basal area and a conical shape (0.64 m high × 0.57 m top diameter). The photostage comprised transparent reinforced polyvinyl chloride (PVC) tubing with spirally wound, metal-wire reinforcing in the tubing wall (31 m in length and 1.6 cm internal diameter with 0.25 cm wall thickness; total volume = 6.23 l). The inner surface of the photostage (0.651 m2) was illuminated with compact fluorescent cool white lamps; the photosynthetically active radiation (400–700 nm) energy input into the photobioreactor was 1249 KJ day–1 (12 h day/12 h night). The operation of an air-lift photobioreactor with CO2-enriched air (4%) at a flow rate of 0.3 l min–1 showed a maximum daily photosynthetic efficiency of 6.83% under batch-culture conditions. This corresponded to a production rate of 15.9 g dry biomass m–2(basal area) day–1 or 0.51 g dry biomass l medium–1 day–1. |
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