Abstract
This paper reports an experimental degradation study of nineteen multi-class pharmaceutical products present in the influent wastewater arriving at the Daugavgriva wastewater treatment plant. Collected wastewater samples were filtered and irradiated by electron beam and gamma radiation both generated from a 5 MeV linear particle accelerator. The samples were exposed to ten absorbed doses (0.5–25 kGy) produced at high dose rates (600 and 1200 kGy h−1 for accelerated electrons, as well as 22.5 and 37.5 kGy h−1 for gamma radiation). The analysis by a sensitive liquid chromatography–mass spectrometry method indicated that the initial concentrations of pharmaceutical residues were effectively reduced by up to 90–100% in eighty per cent of the cases when samples were exposed to 0.5–5 kGy of electron beam or gamma radiation treatment. Higher doses (>5 kGy) were needed to decompose macrolide antibiotics. The use of electron beam radiation showed some advantages due to the reduced exposure time, thus enabling a more energy efficient treatment resulting in the degradation of pharmaceutical residues comparable to that achieved by gamma irradiation. Microbiological studies indicated the pronounced degradation effect on bacterial contamination of wastewater, which was successfully eliminated upon increasing the radiation, dose up to 7–12 kGy.
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04 April 2017
An erratum to this article has been published.
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Acknowledgements
The presented work has received funding from the project “Establishing of the scientific capacity for the management of pharmaceutical products residues in the environment of Latvia and Norway”, co-funded by the Norwegian Financial Mechanism 2009–2014, Contract No. NFI/R/2014/010.
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Editorial responsibility: BV Thomas.
An erratum to this article is available at https://doi.org/10.1007/s13762-017-1325-z.
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Reinholds, I., Pugajeva, I., Perkons, I. et al. Decomposition of multi-class pharmaceutical residues in wastewater by exposure to ionising radiation. Int. J. Environ. Sci. Technol. 14, 1969–1980 (2017). https://doi.org/10.1007/s13762-017-1290-6
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DOI: https://doi.org/10.1007/s13762-017-1290-6