Volume 18 Issue 3
Jun.  2005
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LIN WANG, QI-FANG LUO. Biodegradation Characteristics of Environmental Endocrine Disruptor Di-n-butyl Phthalate[J]. Biomedical and Environmental Sciences, 2005, 18(3): 187-191.
Citation: LIN WANG, QI-FANG LUO. Biodegradation Characteristics of Environmental Endocrine Disruptor Di-n-butyl Phthalate[J]. Biomedical and Environmental Sciences, 2005, 18(3): 187-191.

Biodegradation Characteristics of Environmental Endocrine Disruptor Di-n-butyl Phthalate

Funds:  国家自然科学基金(Grant 30271104)
  • Objective The biodegradation characteristics of di-n-butyl phthalate (DBP), an environmental endocrine disruptor, were studied by the method of dominant bacteria and immobilized microorganisms. Methods Taking DBP as the only carbon source to acclimatize the collected activated sludge, the concentration of DBP increased progressively in the process of acclimatization. Plate streaking was used to separate 1 strain of the degradation dominant bacteria after acclimatization. Better conditions to degrade DBP by the bacterium could be obtained through orthogonal experiments and the bacterium was identified. Then the acclimated activated sludge was made to immobilize the microorganism using polyvinyl alcohol as entrapment agent. The immobilized microorganism degraded DBP at different conditions. Results The appropriate conditions to degrade DBP by the dominant bacteria were: degradation time, 32 h; DBP concentration, 200 mg/L; rate of shaking incubator, 100 r/min; pH, 7 and temperature, 30℃. DBP could be degraded by more than 95% under such conditions. The bacteria were identified as pseudomonas. The proliferated immobilized microorganisms degraded DBP more effectively and more adapted to temperature and pH than the free acclimated activated sludge. Conclusion One strain of DBP degradation dominant bacteria was separated from the acclimatized activated sludge. It could grow with DBP as the only carbon source and energy, and degraded DBP effectively. After having been immobilized and proliferated, the dominant bacteria could keep a higher biological activity and degrade DBP more effectively than activated sludge.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Biodegradation Characteristics of Environmental Endocrine Disruptor Di-n-butyl Phthalate

Funds:  国家自然科学基金(Grant 30271104)

Abstract: Objective The biodegradation characteristics of di-n-butyl phthalate (DBP), an environmental endocrine disruptor, were studied by the method of dominant bacteria and immobilized microorganisms. Methods Taking DBP as the only carbon source to acclimatize the collected activated sludge, the concentration of DBP increased progressively in the process of acclimatization. Plate streaking was used to separate 1 strain of the degradation dominant bacteria after acclimatization. Better conditions to degrade DBP by the bacterium could be obtained through orthogonal experiments and the bacterium was identified. Then the acclimated activated sludge was made to immobilize the microorganism using polyvinyl alcohol as entrapment agent. The immobilized microorganism degraded DBP at different conditions. Results The appropriate conditions to degrade DBP by the dominant bacteria were: degradation time, 32 h; DBP concentration, 200 mg/L; rate of shaking incubator, 100 r/min; pH, 7 and temperature, 30℃. DBP could be degraded by more than 95% under such conditions. The bacteria were identified as pseudomonas. The proliferated immobilized microorganisms degraded DBP more effectively and more adapted to temperature and pH than the free acclimated activated sludge. Conclusion One strain of DBP degradation dominant bacteria was separated from the acclimatized activated sludge. It could grow with DBP as the only carbon source and energy, and degraded DBP effectively. After having been immobilized and proliferated, the dominant bacteria could keep a higher biological activity and degrade DBP more effectively than activated sludge.

LIN WANG, QI-FANG LUO. Biodegradation Characteristics of Environmental Endocrine Disruptor Di-n-butyl Phthalate[J]. Biomedical and Environmental Sciences, 2005, 18(3): 187-191.
Citation: LIN WANG, QI-FANG LUO. Biodegradation Characteristics of Environmental Endocrine Disruptor Di-n-butyl Phthalate[J]. Biomedical and Environmental Sciences, 2005, 18(3): 187-191.

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