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<p>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&#xa0;kGy significantly outperformed other processes. Gamma treatment at 4.5&#xa0;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. <i>Enterococcus faecium</i> was identified as the most radio-resistant strain. The investigation of dose rate effect on <i>E. faecium</i> inactivation revealed that the D<sub>10</sub> value decreased (2.17, 1.49, and 0.76&#xa0;kGy) with an increase in dose rate (257&#xa0;Gy/h for gamma-ray, 1087&#xa0;Gy/h for gamma-ray, and 2500&#xa0;Gy/s for e-beam). These findings demonstrate that radiation processing offers a robust solution for reducing global health risks associated with hospital wastewater.</p>

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Efficacy of radiation technologies in reducing microbial contamination in hospital wastewater

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Ayşenur Genç,
  • Ece Ergun,
  • Elif İnce,
  • Mahir İnce,
  • Ömer Kantoğlu,
  • Hilal Halkman

摘要

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.