Development of high performance photosynthetic bioreactor for the fixation of carbon dioxide

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The high performance of photosynthesis in the micro algae is required for gas excange system in CELSS system and fixing carbon dioxide in the atmosphere. Tubular photosynthetic bioreactors are desirable for achieving the efficient design of reactor because of the efficient way of illumination and producing the hydrodynamically mixing in the micro algae suspension. The purpose of this study is to measure the photosynthetic rate of micro algae and clarify the process of photosynthesis with the presence of hydrodyna flow in the tubular reactor system and find the optimum design of reactor achieving the maximum performa photosynthetic rate. Two types of reactors were employed for the prototype units. The first one (CDTR1) is coaxial double cylinder type and the second one (CDTR2) is a coaxial double cylinders with ribs on the inn surface of tubular reactor to mix suspension and scatter light. In high concentrated suspension, the oxygen production rate for the illumination from both outside and inside in CDTR2 was 1.5 times higher than that illumination from outside only in CDTR1. For higher flow rate in the tubular photobioreactor illumination condition for micro algae was improved and growth rate became larger. In micro algae tubular photobiorea with higher concentration, scattering light from both outside and inside which improves illumination condit for micro algae is effective for promoting the performance of photosynthesis.