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18. Radiation Induced Degradation of Organic Pollutants in Waters and Wastewaters

Author

Wojnárovits, László, Takács, Erzsébet, Wong, Wai-Yeung, Editor-in-chief, Olivucci, Massimo, Editor-in-chief, Bayley, Hagan, Series editor, Houk, Kendall N., Series editor, Hughes, Greg, Series editor, Hunter, Christopher A., Series editor, Hwang, Seong-Ju, Series editor, Ishihara, Kazuaki, Series editor, Kirchner, Barbara, Series editor, Krische, Michael J., Series editor, Larsen, Delmar, Series editor, Lehn, Jean-Marie, Series editor, Luque, Rafael, Series editor, Siegel, Jay S., Series editor, Thiem, Joachim, Series editor, Venturi, Margherita, Series editor, Wong, Chi-Huey, Series editor, Wong, Henry N.C., Series editor, Yam, Vivian Wing-Wah, Series editor, Yan, Chunhua, Series editor, You, Shu-Li, Series editor, and D’Angelantonio, Mila, editor

Published
2017
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27. Ionizing Radiation Induced Removal of Ofloxacin, Abatement of Its Toxicity and Antibacterial Activity in Various Water Matrices.

Author

Wojnárovits, László, Homlok, Renáta, Kovács, Krisztina, Bezsenyi, Anikó, and Takács, Erzsébet

Subjects
IONIZING radiation, ANTIBACTERIAL agents, SEWAGE disposal plants, VIBRIO fischeri, DRINKING water, HYDROXYL group
Abstract

The fluoroquinolone-type antibiotic ofloxacin is regularly detected in wastewaters. In this work, its hydroxyl radical (•OH) induced degradation was studied at a concentration of 0.1 mmol dm−3 in three water matrices, pure water, tap water, and purified wastewater (collected from a wastewater treatment plant). •OH was produced by γ-irradiation under conditions when it had a high yield. The •OH dosage dependencies of chemical (COD) and biochemical (BOD) oxygen demands, total organic carbon (TOC) content, oxygen uptake rate (OUR), Microtox® toxicity, and antibacterial activity values were evaluated. •OH effectively oxidized and mineralized ofloxacin; both processes were observed even at the lowest •OH dosage, 0.14 mmol dm−3 (0.5 kGy absorbed dose). When 0.28 mmol dm−3 •OH was introduced into pure or tap water, the antibacterial activity vanished. In purified wastewater, a higher dosage (0.56 mmol dm−3) was required to achieve the same effect as in pure water, due to the organic molecules of the matrix that quenched the •OH radicals. The products did not have antibacterial activity and showed little toxicity toward the test organism Vibrio fischeri. •OH preferentially attacks the pharmacophore part, the 4-quinolone unit of ofloxacin. •OH-induced reactions can be safely applied to destroy the antimicrobial potency of fluoroquinolone-type antibiotics in purified wastewater matrices. [ABSTRACT FROM AUTHOR]

Published
2023
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