Pharmaceutical and personal care products in tile drainage following surface spreading and injection of dewatered municipal biosolids to an agricultural field |
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Authors: | M Edwards CD Metcalfe N Gottschall W Curnoe A Beck DR Lapen |
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Affiliation: | a Agriculture and Agri-Food Canada, Ottawa ON, Canada K1A 0C6 b Agriculture and Agri-Food Canada, London ON, Canada N5V 4T3 c Worsfold Water Quality Centre, Trent University, Peterborough, ON, Canada K9J 7B8 d University of Guelph-Kemptville, Kemptville, ON, Canada K0G 1G0 e Ontario Ministry of Agriculture, Food and Rural Affairs, Stratford, ON, Canada N5A 5T8 f Health Canada, New Substances Assessment and Control Bureau, Ottawa ON, Canada K1A 0K9 g Ontario Ministry of the Environment, Toronto, ON, Canada M4V 1M2 |
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Abstract: | Land application of municipal biosolids can be a source of environmental contamination by pharmaceutical and personal care products (PPCPs). This study examined PPCP concentrations/temporally discrete mass loads in agricultural tile drainage systems where two applications of biosolids had previously taken place. The field plots received liquid municipal biosolids (LMB) in the fall of 2005 at an application rate of ∼ 93,500 L ha− 1, and a second land application was conducted using dewatered municipal biosolids (DMB) applied at a rate of ∼ 8 Mt dw ha− 1 in the summer of 2006. The DMB land application treatments consisted of direct injection (DI) of the DMB beneath the soil surface at a nominal depth of ∼ 0.11 m, and surface spreading (SS) plus subsequent tillage incorporation of DMB in the topsoil (∼ 0.10 m depth). The PPCPs examined included eight pharmaceuticals (acetaminophen, fluoxetine, ibuprofen, gemfibrozil, naproxen, carbamazepine, atenolol, sulfamethoxazole), the nicotine metabolite cotinine, and two antibacterial personal care products triclosan and triclocarban. Residues of naproxen, cotinine, atenolol and triclosan originating from the fall 2005 LMB application were detected in tile water nearly nine months after application (triclocarban was not measured in 2005). There were no significant differences (p > 0.05) in PPCP mass loads among the two DMB land application treatments (i.e., SS vs. DI); although, average PPCP mass loads late in the study season (> 100 days after application) were consistently higher for the DI treatment relative to the SS treatment. While the concentration of triclosan (∼ 14,000 ng g− 1 dw) in DMB was about twice that of triclocarban (∼ 8000 ng g− 1 dw), the average tile water concentrations for triclosan were much higher (43 ± 5 ng L− 1) than they were for triclocarban (0.73 ± 0.14 ng L− 1). Triclosan concentrations (maximum observed in 2006 ∼ 235 ng L− 1) in tile water resulting from land applications may warrant attention from a toxicological perspective. |
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Keywords: | PPCP pharmaceutical and personal care products DMB dewatered municipal biosolids LMB liquid municipal biosolids LOD limits of detection LOQ limits of quantitation SS surface spreading of DMB plus subsequent soil incorporation DI direct injection of DMB WWTP waste water treatment plant |
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