Abstract
The absorption of CO2 and O2 gas into the chlorella suspension and the stripping of O2 gas generated by photosynthesis of chlorella through the hydrophobic microporous hollow fiber membrane of polypropylene took place. The chlorella suspension flowed inside the hollow fibers and the gas mixture of CO2 and air flowed outside them. The following results were obtained :(1) Overall mass transfer coefficient of CO2 and O2 gas for absorption did not depend on the flow rate of gas mixture, the total pressure of gas mixture, the CO2 concentration of gas mixture and the chlorella concentration, but only on the flow rate of suspension, (2) Overall mass transfer coefficient was correlated by the dimensionless equation given below, Sh=A (Pe) 1/3The value of A in equation was smaller than that obtained in the previous papers using the similar type of membrane module. This difference in A was explained by the apparant decrease in interfacial area of membrane per unit volume of suspension due to the dence packing of hollow fibers per unit cross-sectional area of shell in our module as compared with the others, and(3) The supply of CO2 gas and the stripping of O2 gas generated by photosynthesis could be taken place at the same time through the one membrane module.
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