Journal
ENVIRONMENTAL RESEARCH
Volume 212, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2022.113254
Keywords
Quinolones antibiotics; Enro floxacin (ENR); Co-metabolism; Biocathode; Transformation pathways; Microbial community analysis
Funding
- Hainan Provincial Natural Science Foundation of China [419QN171]
- National Natural Science Foundation of China [52100038]
- scientific research of Hainan University [KYQD (ZR) 1947]
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This study developed a biocathode system coupled with different co-metabolism conditions to degrade quinolones, specifically enrofloxacin (ENR). The study found that the degradation rate of ENR was significantly increased when co-metabolism conditions were applied, and different transformation pathways of ENR were observed. Additionally, the study identified the sensitive response of biocathodic communities to carbon source switch-over. This research provides valuable information on treating refractory quinolone antibiotics using a green bioelectrochemical method.
In this study, biocathode system coupled with different co-metabolism conditions (NaAc, glucose and NaHCO3) were developed to degrade quinolones enrofloxacin (ENR) due to its poorly metabolization, easily accumulation and potential toxicity. Simultaneously, ENR reduction kinetic rate constant in NaAc-fed, glucose-fed and NaHCO3-fed biocathodes, and sole biocathode were increased by 343.62%, 320.46%, 189.19% and 130.88% when compared with that of abiotic cathode when the operational time and ENR concentration were set to 48 h and 25 mg/L. In addition, transformation pathways of ENR revealed pathway II were dominantly occurred in NaAc-and glucose-fed biocathode while pathway IV acting as key metabolic process were shown in NaHCO3-fed biocathode. Moreover, 16S rRNA high-throughput sequencing analysis indicated that biocathodic communities were sensitive to switch-over of carbon source, namely Delftia and Bosea as organohalide-respiring bacteria (OHRB) were abundant in NaAc-and glucose-fed biocathodes while Mesotoga and Syntrophorhabdus that responsible for benzoyl-CoA metabolic process were enriched in NaHCO3-fed biocathode. Overall, this study could unravel the underlying relationship between biocathode degradation pattern of ENR and different co-metabolism conditions, and further offer valuable scientific information on treating refractory quinolones an-tibiotics via green bioelectrochemical method.
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