Isolation, Characterization, and Degradation Performance of the 17?-Estradiol-Degrading Bacterium Novosphingobium sp. E2S

Shunyao Li, Juan Liu, Minxia Sun, Wanting Ling and Xuezhu Zhu
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Shunyao Li: Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Juan Liu: Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Minxia Sun: Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Wanting Ling: Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
Xuezhu Zhu: Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China

IJERPH, 2017, vol. 14, issue 2, 1-13

Abstract: A 17?-estradiol (E2)-degrading bacterium E2S was isolated from the activated sludge in a sewage treatment plant (STP). The morphology, biological characteristics, and 16S ribosomal RNA (rRNA) gene sequence of strain E2S indicated that it belonged to the genus Novosphingobium . The optimal degrading conditions were 30 °C and pH 7.0. The ideal inoculum volume was 5% ( v/v ), and a 20-mL degradation system was sufficient to support the removal ability of strain E2S. The addition of extra NaCl to the system did not benefit the E2 degradation in batch culture by this strain. Strain E2S exhibited high degradation efficiency with initial substrate concentrations of 10–50 mg·L ?1 . For example, in mineral salt medium containing 50 mg·L ?1 of E2, the degradation efficiency was 63.29% after seven days. In cow manure samples supplemented with 50 mg·L ?1 of E2, strain E2S exhibited 66.40% degradation efficiency after seven days. The finding of the E2-degrading strain E2S provided a promising method for removing E2 from livestock manure in order to reduce the potential environmental risks of E2.

Keywords: 17?-estradiol; estrogen; degradation; Novosphingobium sp.; cow manure (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
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