Abstract
Sequencing-batch reactors were used to develop an activated sludge enrichment culture capable of degrading 1-naphthylamine (1NA). Approximately 5 months acclimation with salicylic acid (1600 mg l−1) as the primary source of carbon were required to obtain an enrichment culture able to degrade even small quantities of 1NA. After an additional 4 months acclimation, during which the concentration of salicyclic acid was decreased to 50 mg l−1, a culture developed that degraded 1NA concentrations as high as 300 mg l−1. Kinetic determinations showed that 1NA degradation (in the presence of salicylate) followed Michaelis-Menten kinetics with Km and Vm values of 32.5±2.2 mg l−1 and 375±18 ng 1NA mg−1 cells h−1, respectively. The same enrichement was able to degrade 1NA when present as the sole source of carbon and energy and to convert approximately 87% to CO2.
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