Synergetic effect of nano zero-valent iron and activated carbon on high-level ciprofloxacin removal in hydrolysis-acidogenesis of anaerobic digestion

Mingdian Zhou, Chunxing Li, Lixin Zhao, Jing Ning, Xiaofang Pan, Guanjing Cai, Gefu Zhu*

*Corresponding author for this work

Research output: Contribution to journalJournal article

Abstract

Ciprofloxacin is the most commonly prescribed antibiotic, and its widespread use poses threat to environmental safety. The removal of ciprofloxacin from contaminated water has remained a major challenge. The present study investigated adding nanoscale zero-valent iron (NZVI) and activated carbon (AC) on high-level ciprofloxacin removal in hydrolysis-acidogenesis stage of anaerobic digestion. The results showed that the degradation rate of ciprofloxacin increased from 22.61% (Blank group) to 72.41% after adding NZVI/AC with concentration of ciprofloxacin in effluent decreasing from 8.25 mg L−1 to 3.48 mg L−1. The volatile fatty acids (VFAs) yield increased by 173.7% compared with the Blank group. In addition, the NZVI/AC group achieved the highest chemical oxygen demand (COD) removal rate and acidogenesis rate. The microbial community analysis presented that hydrolytic and acidogenic bacteria and microorganisms related to degrading ciprofloxacin were obviously improved in the NZVI/AC group. Moreover, eleven transformation products and the main degradation pathways were proposed based on mass spectrometry information. In summary, the NZVI/AC addition supplied promising approach for ciprofloxacin wastewater treatment.

Original languageEnglish
Article number142261
JournalScience of the Total Environment
Volume752
Number of pages10
ISSN0048-9697
DOIs
Publication statusPublished - 2021

Keywords

  • Ciprofloxacin degradation
  • Degradation pathway
  • Hydrolysis-acidogenesis
  • Microbial community
  • NZVI/AC

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