Quinoline is one of the common refractory organic pollutants in coking wastewater. An aerobic bacterial strain KDQ3 capable of utilizing quinoline as the sole source of carbon, nitrogen and energy was isolated from activated sludge of a coking wastewater treatment plant. The morphological properties and the 16S rDNA sequence identified KDQ3 as sp.. The optimized temperature and initial pH for quinoline degradation were 37℃ and 7.0-8.0, and the degradation kinetics fit with Haldane's model. KDQ3 could degrade 200 mg·L quinoline in the presence of 10.4 mg·L hexavalent chromium. In addition, KDQ3 was able to degrade quinoline in real coking wastewater of aerobic tank and improve the removal of COD, indicating that KDQ3 had the potential of bioaugmentation for removal of quinoline from coking wastewater.
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