Abstract
The scum actinomycete Nocardia amarae was grown in batch culture and in chemostat culture on a fructose-peptone-yeast extract substrate. Chemostat growth is modeled with a two-substrate Monod equation incorporating 6 parameters which include maximum growth, kinetic constants for substrate and oxygen, cell yield and wall growth. These parameters were identified by numerically optimizing the fit. Among these parameters μ max = 0.087 ± 0.0075 h −1 and K s = 675 ± 124 mg l −1, a value much higher than found for other activated sludge bacteria. The results are compared with findings of other researches for other sludge bacteria. Different growth strategies of these organisms are discussed.
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