Journal
BIORESOURCE TECHNOLOGY
Volume 313, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123609
Keywords
Aerobic denitrification; Antibiotics degradation; Strain growth characteristics; Denitrifying gene expression; N2O production
Funding
- Natural Science Fund of China [31972842, 41401556]
- Zhejiang Province Science and Technology Projects [2015C03010, 2019SNLF022]
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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 mu g OTC L(-1)h(-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 mu g/L. The transcriptional results revealed that antibiotics exposure caused (< 2h) down-regulation of the denitrifying related genes, but triggered a significant subsequent up-regulation (4 h). Less nitrous oxide productions were observed in both aerobic and anoxic denitrification processes with antibiotics. Overall, the hormesis effect caused by antibiotics exposure indicated a potential approach to enhance the co-metabolism degradation performance for nitrate and antibiotics in aerobic denitrification.
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