Simultaneous aerobic denitrification and antibiotics degradation by strain Marinobacter hydrocarbonoclasticus RAD-2

• Published in: Bioresource technology 2020-10, Vol.313, p.123609-123609, Article 123609
• Main Authors: Ruan, Yunjie, Kumar Awasthi, Mukesh, Cai, Lei, Lu, Huifeng, Xu, Xiangyang, Li, Wenbing
• Format: Article
• Language: English
• Subjects: Aerobic denitrification; Antibiotics degradation; Denitrifying gene expression; N2O production; Strain growth characteristics
• ISSN: 0960-8524; 1873-2976; 1873-2976
• DOI: 10.1016/j.biortech.2020.123609

[Display omitted] •Aerobic denitrification and antibiotics degradation was gained in strain RAD-2.•No significant influence on denitrification performance with antibiotics shock.•Insignificant inhibiting effect on strain growth under antibiotics dosage.•Antibiotics triggered significant time-lapse up-regulation of denitrifying genes.•Less N2O productions were founded in denitrification process with antibiotics. Simultaneous denitrification and antibiotics (oxytetracycline, OTC and ciprofloxacin, CFX) degradation was evaluated using a typical aerobic denitrifying strain Marinobacter hydrocarbonoclasticus RAD-2. There was no significant influence on the aerobic nitrate removal efficiency of strain RAD-2 in the presence of these two antibiotics. Along with denitrification, the average degradation rate of 2.92 μg OTC L−1h−1 was achieved, while no degradation was observed for CFX. The growth behavior indicated that an insignificant inhibition effect could have occurred at an antibiotics dosage lower than 300 μg/L. The transcriptional results revealed that antibiotics exposure caused (