Abstract
The kinetics of acetic acid production by liquid-surface cultures of Acetobacter aceti strain M7 was investigated. Specific rates of acetic acid production (qpf, g acetic acid/ cm2 microbial film per hour), ethanol consumption and oxygen uptake were estimated on the basis of liquid-surface area: these were virtually constant, irrespective of the thickness of the microbial film. The effect of acetic acid concentration (P) on qpf was found to be expressed from a series of experiments, as follows: qpf = 0.0227(1-P/93)2.204. A simple mathematical model was proposed to describe quantitatively the acetic acid production rate as a function of specific surface area and dilution rate. The mathematical model could reasonably well approximate to experimental data in the literature. The oxygen transfer rate through the air-liquid interface of a reactor in the presence of a microbial film was 3.6 times larger than that in the absence of the microbial film.
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