Erythromycin oxidation and ERY-resistant Escherichia coli inactivation in urban wastewater by sulfate radical-based oxidation process under UV-C irradiation
| Main Authors: | I. Michael-Kordatou, M. Iacovou, Z. Frontistis, E. Hapeshi, D.D. Dionysiou, D. Fatta-Kassinos |
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| Format: | Article Journal |
| Terbitan: |
, 2015
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5074231 |
Daftar Isi:
- This study evaluates the feasibility of UV-C-driven advanced oxidation process induced by sulfate radicals (SO4-) in degrading erythromycin (ERY) in secondary treated wastewater. The results revealed that 10 mg L-1 of sodium persulfate (SPS) can result in rapid and complete antibiotic degradation within 90 min of irradiation, while ERY decay exhibited a pseudo-first-order kinetics pattern under the different experimental conditions applied. ERY degradation rate was strongly affected by the chemical composition of the aqueous matrix and it decreased in the order of: ultrapure water (kapp = 0.55 min-1) > bottled water (kapp = 0.26 min-1) > humic acid solution (kapp = 0.05 min-1) > wastewater effluents (kapp = 0.03 min-1). Inherent pH conditions (i.e. pH 8) yielded an increased ERY degradation rate, compared to that observed at pH 3 and 5. The contribution of hydroxyl and sulfate radicals (HO and SO ) on ERY degradation was found to be ca. 37% and 63%, respectively. Seven transformation products 4 (TPs) were tentatively elucidated during ERY oxidation, with the 14-membered lactone ring of the ERY molecule being intact in all cases. The observed phytotoxicity against the tested plant species can potentially be attributed to the dissolved effluent organic matter (dEfOM) present in wastewater effluents and its associated-oxidation products and not to the TPs generated from the oxidation of ERY. This study evidences the potential use of the UV-C/SPS process in producing a final treated effluent with lower phytotoxicity (<10%) compared to the untreated wastewater. Finally, under the optimum experimental conditions, the UV-C/SPS process resulted in total inactivation of ERY-resistant Escherichia coli within 90 min.
- This work was prepared in the framework of the ΚΟYLΤΟYРА/ ВЕNS/0412/24 research project 'Closing Gaps of Knowledge with respect to Advanced Chemical Oxidation Processes for the Removal of Contaminants of Emerging Concern (GAPS)', implemented within the national framework program for research, technological development and innovation 'DESMH 2009-2010'. Nireas-IWRC (NЕА YPΟDΟМН/SΤРАΤН/0308/09) is co-financed by the Republic of Cyprus and the European Regional Development Fund through the Research Promotion Foundation of Cyprus. The authors would like to acknowledge the COST-European Cooperation in Science and Technology Action ES1403: New and emerging challenges and opportunities in wastewater reuse (NEREUS), for stimulating the work implemented in the manuscript.