The value of maximum specific growth rate (mu(max) = 0.0177 h(-1)), the maximum growth value (X(max)= 1.82 g l(-1)) The initial biomass concentration was calculated (X(o) = 0.0285 g l(-1)), the maintenance coefficient (K(c) = 0.245 g g(-1)h(-1)), the biomass yield (Y(X/S) = 0.039 g g(-1)) and the product yield (Y(P/S) = 0.0828 g g(-1)) were calculated from the model. The presented model provided a satisfactory representation of the biomass growth; biosurfactant production. The average error of biomass growth and biosurfactant production were 10.2 and 5.7%; respectively. The present model gave a satisfactory representation of the biomass growth; whereas the average percentage error in biosurfactant production through the fermentation process was 5.74% and in microorganism concentration was 10.172%.
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