| 摘要 |
PURPOSE:To use a carbonic acid gas as a carbon source efficiently and to carry out stirring in a tank efficiently, by setting an air lift part at part of an endless circulating water channel. CONSTITUTION:A wafer tank which carries out culture of fine algae under light irradiation condition using a carbonic acid gas as a carbon source consists of an endless water channel comprising an open water channel 1 and a pipe water channel 2 which communicates an upper stream end b to a downstream end c of the open water channel by passing under the surface of the water prescribed by the open water channel. An air lift part a is set at part of the pipe water channel 2 and a carbonic acid gas is introduced from the bottom of the air lift part to the water tank. Consequently, a circulating flow is formed in the water channel. The carbonic acid gas is recovered from the top of the air lift part a and fed to the bottom of the part.
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