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Application of advanced oxidation processes to doxycycline and norfloxacin removal from water
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 (CAntibiotic = 5 × 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 (CO3 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 O3 and O3/UV-C processes, have been simulated by a pseudoempirical model by considering TOC as a surrogate parameter.
Application of advanced oxidation processes to doxycycline and norfloxacin removal from water
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 (CAntibiotic = 5 × 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 (CO3 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 O3 and O3/UV-C processes, have been simulated by a pseudoempirical model by considering TOC as a surrogate parameter.
Application of advanced oxidation processes to doxycycline and norfloxacin removal from water
Rivas, Javier (author) / Encinas, Ángel (author) / Beltrán, Fernando (author) / Graham, Nigel (author)
Journal of Environmental Science and Health, Part A ; 46 ; 944-951
2011-07-15
8 pages
Article (Journal)
Electronic Resource
Unknown
Application of advanced oxidation processes to doxycycline and norfloxacin removal from water
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