Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 25, Issue 11, Pages 2281-2290Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(12)60293-9
Keywords
carbamazepine; low temperatures; biodegradation kinetics; Pseudomonas sp.
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Funding
- National Creative Research Group from the National Natural Science Foundation of China [51121062]
- National Natural Science Foundation of China [51108120, 51178139]
- China Postdoctoral Science Foundation [201104430]
- 46th China Postdoctoral Science Foundation [20090460901]
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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 degrees 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 degrees 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. V-max and K-s were found to be 0.0094 hr(-1) and 32.5 mg/L, respectively.
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