Characterization and biodegradation kinetics of a new cold-adapted carbamazepine-degrading bacterium, Pseudomonas sp. CBZ-4 |
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Authors: | Ang Li Rui Cai Di Cui Tian Qiu Changlong Pang Jixian Yang Fang Ma and Nanqi Ren |
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Institution: | Ang Li;Rui Cai;Di Cui;Tian Qiu;Changlong Pang;Jixian Yang;Fang Ma;Nanqi Ren;State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology;National Supervision and Inspection Center of Environmental Protection Equipment Quality, Yixing Urban Supervision andInspection Administration of Product Quality; |
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Abstract: | Carbamazepine is frequently detected in waters and hardly eliminated during conventional wastewater treatment processes due to its complicated chemical structure and resistance to biodegradation. A carbamazepine-degrading bacterium named CBZ-4 was isolated at a low temperature (10°C) from activated sludge in a municipal wastewater treatment plant. Strain CBZ-4, which can use carbamazepine as its sole source of carbon and energy, was identified as Pseudomonas sp. by the 16S rRNA gene sequence. The composition and percentage of fatty acids, which can reveal the cold-adaptation mechanism of strain CBZ-4, were determined. Strain CBZ-4 can effectively degrade carbamazepine at optimal conditions: pH 7.0, 10°C, 150 r/min rotation speed, and 13% inoculation volume. The average removal rate of carbamazepine was 46.6% after 144 hr of incubation. The biodegradation kinetics of carbamazepine by CBZ-4 was fitted via the Monod model. Vmax and Ks were found to be 0.0094 hr?1 and 32.5 mg/L, respectively. |
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Keywords: | carbamazepine low temperatures biodegradation kinetics Pseudomonas sp |
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