نبذة مختصرة : application/pdf ; There has been increasing concern recently over the potential of estrogens and their mimics to cause estrogenic effects on aquatic fauna. Recently, we found Sphingomonas cloacae, the nonylphenol -degrading bacterium, and Novosphingobium tardaugenes, the estradiol-degrading bacterium, from sewage treatment plants. Nonylphenol was biodegraded to nonanol, while estradiol was suggested to be degraded to CO2 or volatile compounds. Subsequently, S. cloacae was evaluated for its utility in remediation of NP-contaminated wastewater. We next constructed and evaluated a lab-scale wastewater treatment system with a 3 L column which was filled with S. cloacae-immobilizing carriers. The system worked properly and removed several hundreds of ppb of NP to ecologically safe concentrations of less than 10 ppb in wastewater. The wastewater samples with pH values of 6 or 8 were also treated efficiently without pH adjustment. These results suggested that the biotreatment system could efficiently remediate industrial wastewater and contribute to the preservation of aquatic environments. ; 特集 : 「環境調和型社会を指向して」 ; departmental bulletin paper
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