Browsing by ORCID "0000-0001-5630-3965"

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    Efficacy of radiation technologies in reducing microbial contamination in hospital wastewater
    (Springer, 2026-02-14) Genç, Ayşenur; Ergun, Ece; İnce, Elif; İnce, Mahir; Kantoğlu, Ömer
    This study evaluates the effectiveness of ionizing radiation in reducing the microbial loads of hospital wastewater, comparing to on-site hospital treatment plant and membrane bioreactor system. The gamma irradiation above 2 kGy significantly outperformed other processes. Gamma treatment at 4.5 kGy provided more efficient treatment with a 4 log reduction in total aerobic mesophilic bacteria, compared to 1.4 and 2.9 log reductions for the on-site and combined on-site/membrane treatment systems. Enterococcus faecium was identified as the most radio-resistant strain. The investigation of dose rate effect on E. faecium inactivation revealed that the D10 value decreased (2.17, 1.49, and 0.76 kGy) with an increase in dose rate (257 Gy/h for gamma-ray, 1087 Gy/h for gamma-ray, and 2500 Gy/s for e-beam). These findings demonstrate that radiation processing offers a robust solution for reducing global health risks associated with hospital wastewater.
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    EXPERIMENTAL AND THEORETICAL ASSESSMENT OF SELECTED POLLUTANTS TREATED WITH GAMMA RADIATION AND HYDROGEN PEROXIDE
    (Türkiye Enerji, Nükleer ve Maden Araştırma Kurumu (TENMAK), 2024-11-28) Genç, Ayşenur; Ergun, Ece; Fitoz, Alper; Kantoğlu, Ömer; İnce, Mahir; Acar, Orhan
    Degradation of ibuprofen, triclosan, diclofenac, and ketoprofen in real wastewater effluent by gamma radiation/hydrogen peroxide was investigated on the basis of removal efficiencies, G-values, and kinetics. Gamma irradiation was performed using a 60Co source irradiator in the presence of different concentrations of hydrogen peroxide. The analyses of the pollutants were performed before and after irradiation treatment using a Liquid Chromatography-Mass Spectrometry (LC-MS) system. The addition of 0.5% hydrogen peroxide resulted in an enhanced removal efficiency of the target pollutants (93.92% for ibuprofen, 99.47% for triclosan, 86.65% for diclofenac, and 86.32% for ketoprofen) compared with the performance of the gamma irradiation process alone. The rate constants (k) of ibuprofen, triclosan, diclofenac, and ketoprofen increased by 1.42, 2.38, 1.38, and 3.37 times with 0.5% hydrogen peroxide addition, respectively. Moreover, the 90% decomposition of the target pollutants was achieved at lower doses in the gamma-ray/hydrogen peroxide system in comparison with the gamma treatment without hydrogen peroxide. Fukui functions and dual descriptor were calculated using density functional theory (DFT) to investigate the sensitivity of the target pollutants to hydroxyl radical attacks, to identify the initial reaction pathway, and to predict the degradation by-products. The findings were consistent with literature mechanisms and observed by-products.
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    Experimental and theoretical assessment of selected pollutants treated with gamma radiation and hydrogen peroxide
    (ELSEVIER, 2024-12-15) Genç, Ayşenur; Ergun, Ece; Fitoz, Alper; Kantoğlu, Ömer; İnce, Mahir; Acar, Orhan
    Degradation of ibuprofen, triclosan, diclofenac, and ketoprofen in real wastewater effluent by gamma radiation/ hydrogen peroxide was investigated on the basis of removal efficiencies, G-values, and kinetics. Gamma irradiation was performed using a60Co source irradiator in the presence of different concentrations of hydrogen peroxide. The analyses of the pollutants were performed before and after irradiation treatment using a Liquid Chromatography-Mass Spectrometry (LC-MS) system. The addition of 0.5% hydrogen peroxide resulted in an enhanced removal efficiency of the target pollutants (93.92% for ibuprofen, 99.47% for triclosan, 86.65% for diclofenac, and 86.32% for ketoprofen) compared with the performance of the gamma irradiation process alone. The rate constants (k) of ibuprofen, triclosan, diclofenac, and ketoprofen increased by 1.42, 2.38, 1.38, and 3.37 times with 0.5% hydrogen peroxide addition, respectively. Moreover, the 90% decomposition of the target pollutants was achieved at lower doses in the gamma-ray/hydrogen peroxide system in comparison with the gamma treatment without hydrogen peroxide. Fukui functions and dual descriptor were calculated using density functional theory (DFT) to investigate the sensitivity of the target pollutants to hydroxyl radical attacks, to identify the initial reaction pathway, and to predict the degradation by-products. The findings were consistent with literature mechanisms and observed by-products.