Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Department of Environmental Engineering, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark.
Sci Total Environ. 2021 Jan 15;752:142261. doi: 10.1016/j.scitotenv.2020.142261. Epub 2020 Sep 7.
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 to 3.48 mg L. 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.
环丙沙星是最常用的抗生素，其广泛使用对环境安全构成威胁。从受污染的水中去除环丙沙星仍然是一个主要挑战。本研究调查了在厌氧消化的水解-产酸阶段添加纳米零价铁 (NZVI) 和活性炭 (AC) 以去除高水平的环丙沙星。结果表明，添加 NZVI/AC 后，环丙沙星的降解率从 22.61%（空白组）增加到 72.41%，出水中环丙沙星的浓度从 8.25mg/L 降低到 3.48mg/L。与空白组相比，挥发性脂肪酸 (VFAs) 产量增加了 173.7%。此外，NZVI/AC 组实现了最高的化学需氧量 (COD) 去除率和产酸率。微生物群落分析表明，NZVI/AC 组中水解和产酸细菌以及与降解环丙沙星有关的微生物明显得到改善。此外，基于质谱信息提出了十一种转化产物和主要降解途径。总之，NZVI/AC 的添加为环丙沙星废水处理提供了有前景的方法。
