Abstract
The characteristics of oxygen absorption in a shallow flow reactor, in which a microbial film was developed on the liquid surface, were investigated in connection with biooxidative removal of acetic acid. The oxygen absorption rate (OAR) through the microbial film was estimated from the decrease in acetic acid concentration based on the experimental fact that acetic acid was oxidized stoichiometrically by the microbial film. The OAR values were 3.5 to 7.3-fold greater than those measured by the sulfite oxidation method with the same liquid depth and liquid flow rate. A theoretical approach using the equations of diffusion and consumption of oxygen in the microbial film could not predict the enhancement well. The increment of OAR was likely to be attributed to the wrinkling surface of the microbial film that had a substantially larger surface area than the free liquid surface.
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