Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 190, Issue 1-3, Pages 253-259Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2011.03.036
Keywords
Pseudomonas sp.; Carbazole; Biodegradation; Nitrogen transformation
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Funding
- Chinese Ministry of Science and Technology [2009AA06Z309]
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Carbazole, one representative of non-alkaline nitrogen heterocyclic compounds, is widespread in the natural environment and harmful to human health. In this research, the seven bacterial strains using carbazole as their sole carbon, nitrogen and energy source were isolated from activated sludge of a coking wastewater treatment plant. All strains efficiently degraded 500 mg/L of carbazole in the medium within 36 h. Based on the DNA sequence and phylogenetic tree analysis, the seven strains were identified as the genera Pseudomonas with different evolutionary pathways. PCR analysis revealed that the seven isolates carried the car gene. Moreover, all of these strains could utilize and transform ammonium and nitrate efficiently, and the six strains except BC043 strain coded the nitrite reductase gene (nirS) and the nitrous oxide reductase (nosZ), that indicated their denitrification ability. All these strains may be useful in the bioremediation of environments contaminated by carbazole. (C) 2011 Elsevier B.V. All rights reserved.
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