Effect of copper(II) on biodegradation of benzo[a]pyrene by Stenotrophomonas maltophilia |
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| Authors: | Shuona Chen Hua Yin Jinshao Ye Hui Peng Na Zhang Baoyan He |
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| Institution: | 1. Department of Environmental Engineering, Jinan University, Guangzhou 510632, PR China;2. Key Laboratory of water/soil toxic pollutants control and bioremediation of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, PR China;3. College of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, PR China;4. The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, PR China |
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| Abstract: | Benzoa]pyrene (BaP) biodegradation by Stenotrophomonas maltophilia was studied under the influence of co-existed Cu(II) ions. About 45% degradation was achieved within 3 d when dealing with 1 mg L?1 BaP under initial natural pH at 30 °C; degradation reached 48% in 2 d at 35 °C. Efficacy of BaP biodegradation reached the highest point at pH 4. In the presence of 10 mg L?1 Cu(II) ions, the BaP removal ratio was 45% on 7th day, and maintained stable from 7 to 14 d at 30 °C under natural pH. The favorable temperature and pH for BaP removal was 25 °C and 6.0 respectively, when Cu(II) ions coexisted in the solutions. Experiments on cometabolism indicated that S. maltophilia performed best when sucrose was used as an additional carbon source. GC–MS analysis revealed that the five rings of BaP opened, producing compounds with one or two rings which were more bioavailable. |
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