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Substrate Inhibition of the Growth of Bacterium ncib 8250 by Phenol

SUMMARY: Examination of the growth kinetics of Bacterium NCIB 8250 in a two-stage continuous culture showed that growth of this organism on phenol could be accounted for by the Haldane function for substrate inhibition. The magnitude of the constants (K
s
< 1 mg/l; and K
i
, no mg/l) was such that inhibition was the dominant factor governing the growth of the organism even at substrate concentrations less than 10 mg/l. The maintenance requirement of the organism was high (0·24 to 0·28 g/g h), probably owing to the energy requirement for rupture of the aromatic nucleus of the substrate.
The influence of such kinetics on the treatment of inhibitory wastes by the activated-sludge process is discussed. Extreme sensitivity of the experimental system to slight changes in operating conditions was explicable by a mathematical model using constants found in the investigations.