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Introduction of human pharmaceuticals from wastewater treatment plants into the aquatic environment: a rural perspective

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Abstract

Incomplete removal of pharmaceuticals during wastewater treatment can result in their discharge into the aquatic environment. The discharge of pharmaceuticals in wastewater treatment plant (WWTP) effluents into rivers, lakes and the oceans has led to detectable concentrations of pharmaceuticals in the aquatic environment in many countries. However, to date studies of WWTP discharges into the aquatic environment have largely been confined to areas of relatively high population density, industrial activity or systems impacted on by such areas. In this work, two sites in the far north of Scotland were used to assess whether, and which, pharmaceuticals were being introduced into natural waters in a rural environment with low population density. Samples from two WWTPs (with differing modes of operation), and one receiving water, the River Thurso, were analysed for the presence of 12 pharmaceuticals (diclofenac, clofibric acid, erythromycin, ibuprofen, mefenamic acid, paracetamol, propranolol, sulfamethoxazole, tamoxifen, trimethoprim and dextropropoxyphene). Ten of the 12 pharmaceuticals investigated were detected in at least one of the 40 WWTP effluent samples. Maximum concentrations ranged from 7 ng L−1 (sulfamethoxazole) to 22.8 μg L−1 (paracetamol) with diclofenac and mefenamic acid being present in all of samples analysed at concentrations between 24.2 and 927 ng L−1 and 11.5 and 22.8 μg L−1, respectively. Additionally, the presence of four pharmaceuticals at ng L−1 levels in the River Thurso, into which one of the WWTPs discharges, shows that such discharges result in measurable levels of pharmaceuticals in the environment. This provides direct evidence that, even in rural areas with low population densities, effluents from WWTPs can produce quantifiable levels of human pharmaceutical in the natural aquatic environment. These observations indicate that human pharmaceuticals may be considered as contaminants, with potential to influence water quality, management and conservation not only in urban and industrial regions but also those more rural in nature.

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Authors and Affiliations

  1. Environmental Research Institute, North Highland College, University of the Highlands and Islands, Castle Street, Thurso, Caithness, Scotland, KW14 7JD, UK

    Carolina Nebot, Kenneth G. Boyd & Stuart W. Gibb

  2. Department of Analytical Chemistry, Nutrition and Bromatology, Faculty of Veterinary Medicine, University of Santiago de Compostela, 27002, Lugo, Spain

    Carolina Nebot

  3. University of Portsmouth, University House, Winston Churchill Avenue, Portsmouth, PO1 2UP, UK

    Raquel Falcon

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  1. Carolina Nebot
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  2. Raquel Falcon
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  3. Kenneth G. Boyd
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  4. Stuart W. Gibb
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Correspondence to Carolina Nebot.

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Responsible editor: Leif Kronberg

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Nebot, C., Falcon, R., Boyd, K.G. et al. Introduction of human pharmaceuticals from wastewater treatment plants into the aquatic environment: a rural perspective. Environ Sci Pollut Res 22, 10559–10568 (2015). https://doi.org/10.1007/s11356-015-4234-z

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  • DOI: https://doi.org/10.1007/s11356-015-4234-z

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