期刊
CHEMICAL ENGINEERING JOURNAL
卷 240, 期 -, 页码 211-220出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2013.11.057
关键词
Antibiotics; Wastewater; Removal; Nanofiltration; Ozonation; UV/O-3
资金
- Fundamental Research Funds for the Central Universities
- National Natural Science Foundation of China [NSFC 51278079]
- Open Project of State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [ESK201301]
This work did a systematic investigation on removal of trace antibiotics from wastewater treatment plant (WWTP) effluent through nanofiltration (NF), and disposal of the NE concentrate by advanced oxidation processes (AOPs). Four antibiotics, namely, norfloxacin (NOR), ofloxacin (OFL), roxithromycin (ROX) and azithromycin (AZI), which had high detection frequencies in effluents from WWTPs in Dalian (China), were selected as the target micropollutants. High rejections of antibiotics (>98%) were obtained in all sets of NF experiments. UV254 photolysis, ozonation and UV/O-3 process were employed to treat NF concentrate. Results demonstrated that UV254 photolysis was not effective in degrading the four antibiotics, while ozone-based processes exhibited high removal efficiencies in 30 min. A synergetic effect between O-3 and UV was observed in degradation of the selected antibiotics during UV/O-3 treatment. Generation of hydroxyl radicals in the process was testified using electron paramagnetic resonance (EPR) spin trapping technology. In treatment of NF concentrate from real secondary effluent, UV/O-3 process achieved excellent removal efficiencies of antibiotics (>87%), a partial removal of dissolved organic carbon (DOC) (40%), an increase of BOD5/COD ratio (4.6 times), and a reduction of acute toxicity (58%). The study revealed that nanofiltration could efficiently remove antibiotics from WWTP effluent, and meanwhile, UV/O-3 process was able to further eliminate the antibiotics in the NF concentrate effectively. (C) 2013 Elsevier B.V. All rights reserved.
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