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Stankov V, Stankov MN, Cvetnić M, Sigurnjak Bureš M, Ukić Š, Kučić Grgić D, Lončarić Božić A, Kušić H, Bolanča T. Environmental aspects of UV-C-based processes for the treatment of oxytetracycline in water. Environ Pollut 2021; 277:116797. [PMID: 33647807 DOI: 10.1016/j.envpol.2021.116797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 02/16/2021] [Accepted: 02/17/2021] [Indexed: 06/12/2023]
Abstract
This study is focused on oxytetracycline (OTC) degradation by direct photolysis (UV-C) and photobased advanced oxidation processes (AOPs) (UV-C/H2O2 and UV-C/S2O82-). OTC degradation pathways were revealed by LC-MS/MS and GC-MS/MS analyses. The evolution/degradation profiles of 12 detected byproducts were correlated with changes in biodegradability and toxicity toward Vibrio fischeri recorded during the treatment. Both photobased AOPs yielded higher OTC degradation and mineralization rates than direct photolysis. The OTC degradation pathway was found to be rather specific regarding the main reactive species (HO• or SO4•-)/mechanism, yielding different patterns in toxicity changes, while biodegradability profiles were less affected. Biodegradability was correlated with the observed degradation and mineralization kinetics. The recorded toxicity changes indicate that byproducts formed by initial OTC degradation are more toxic than the parent pollutant. The prolonged treatment resulted in the formation of byproducts that contributed to a decrease in toxicity and an increase in biodegradability, as particularly emphasized in the case of UV-C/S2O82-.
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Affiliation(s)
- Vladimir Stankov
- Sample Control D.o.o., Franje Puškarića 18, 10250, Lučko, Croatia; University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Mirjana Novak Stankov
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Matija Cvetnić
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Marija Sigurnjak Bureš
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Šime Ukić
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Dajana Kučić Grgić
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Ana Lončarić Božić
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia
| | - Hrvoje Kušić
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia.
| | - Tomislav Bolanča
- University of Zagreb, Faculty of Chemical Engineering and Technology, Marulićev Trg 19, 10000, Zagreb, Croatia; University North, Trg Dr. Žarka Dolinara 1, Koprivnica, 48000, Croatia
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