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A mixture of nine polychlorinated biphenyl (PCB) congeners with four to six chlorine substituents was cometabolized in an aerobic chemostat culture of Alcaligenes sp. JB1, grown on 3-methylbenzoate. Pseudo-first-order biodegradation rate constants (k b ) were calculated using a steady-state kinetic model. These rate constants varied from 7.8 to 0.44 h -1 . Comparable results for exposure to high and low influent concentrations confirmed the assumption of pseudo-first-order kinetics for most of the congeners studied. Alcaligenes sp. JB1 was found to degrade 2,3-dichlorophenyl rings very rapidly and 2,5-dichlorophenyl rings relatively slowly. Certain penta- and hexachlorobiphenyls were degraded faster than some tetrachlorobiphenyls. For example, 2,2',3,3',6,6'-hexachlorobiphenyl was degraded faster than 2,2',6,6'-tetrachlorobiphenyl. On the other hand, 2,2',3,3',4,4'-HCB was degraded much more slowly than 2,2',3,3'-TCB. A control experiment with Pseudomonas fluorescens NCTC10038, a bacterium incapable of PCB (co)metabolism, showed that losses caused by physical or chemical phenomena were negligible.

Biodegradation Kinetics of Highly Chlorinated Biphenyls by Alcaligenes sp. JB1 in an Aerobic Continuous Culture System