Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART A-TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING
Volume 46, Issue 9, Pages 944-951Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10934529.2011.586249
Keywords
Endocrine disruptor; water remediation; ozone; kinetics; mineralization; norfloxacin; doxycycline
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Funding
- CICYT of Spain
- European FEDER [CTQ 2009/13459/C05/05, CSD2006-00044]
- Ministry of Science and Education of Spain
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Doxycycline (Dxy) and Norfloxacin (Nfx) have been oxidized by means of different technologies of increasing complexity. Preliminary experiments showed that activated carbon adsorption (1.0 g L-1) of these antibiotics (C-Antibiotic = 5 x 10(-5) M) led to a 60 and 85 % of total organic carbon (TOC) removal, however, a significant decrease in adsorption capacity was experienced after several reuses of the adsorbent. UV-C irradiation of Dxy (20 % removal in 2 h) or Nfx (90 % removal in 2 h) did not affect the initial TOC content of the solution while single ozonation (C-O3 gas inlet concentration = 15.0 ppm) led to the instantaneous disappearance of the parent compounds while TOC conversion values in the proximity of 40 % were obtained. Complex systems based on the combination of ozone, UV-C radiation, titanium dioxide and activated carbon led to similar TOC removals of the order of 70 and 65 % for Dxy and Nfx, respectively. An attempt has been made to calculate the quantum yield and direct ozonation rate constants for doxycycline and norfloxacin. Additionally, the best systems, i.e., the O-3 and O-3/UV-C processes, have been simulated by a pseudoempirical model by considering TOC as a surrogate parameter.
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