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Batch experiments were conducted to examine the effects of high concentrations of 1,1,1-trichloroethane (TCA) on the biotransformation of TCA by Clostridium sp. strain TCAIIB. The biotic dehalogenation of TCA to 1,1-dichloroethane by nongrowing cells was measured at 35 degrees C, and the data were used to obtain the kinetic parameters of the Monod relationship half-velocity coefficient Ks (31 microM) and the coefficient of maximum rate of TCA biotransformation (kTCA; 0.28 mumol per mg per day). The yield of biomass decreased with an increase in the TCA concentration, although TCA concentrations up to 750 microM did not completely inhibit bacterial growth. Also, kTCA was higher in the presence of high concentrations of TCA. A mathematical model based on a modified Monod equation was used to describe the biotransformation of TCA. The abiotic transformation of TCA to 1,1-dichloroethene was measured at 35 degrees C, and the first-order formation rate coefficient for 1,1-dichloroethene (ke) was determined to be 0.86 per year.

Kinetics of biotransformation of 1,1,1-trichloroethane by Clostridium sp. strain TCAIIB