Abstract
Continuous lactic acid fermentation was carried out to produce an appropriate feed solution for rapid ethanol fermentation in soy sauce production. Lactic acid bacteria were immobilised physically within porous alumina ceramic beads and the fermentation substrate was a filtered extract of soy sauce mash. Lactic acid concentration was controlled by dilution rate. The volumetric production rate was dependent on the dilution rate and was much higher than that in batch fermentation. The lactic acid productivity was mathematically modelled from the basic material balance and the rate equation. The simulated results agreed with the experimental ones.
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