Suspended solids moderate the degradation and sorption of waste water-derived pharmaceuticals in estuarine waters

Type Article
Date 2018-01
Language English
Author(s) Aminot YannORCID1, Fuster Laura1, Pardon Patrick1, Le Menach Karyn1, Budzinski Helene1
Affiliation(s) 1 : Univ Bordeaux, EPOC, UMR 5805, LPTC, 351 Cours Liberat, F-33400 Talence, France.
Source Science Of The Total Environment (0048-9697) (Elsevier Science Bv), 2018-01 , Vol. 612 , P. 39-48
DOI 10.1016/j.scitotenv.2017.08.162
WOS© Times Cited 26
Keyword(s) Pharmaceuticals, Degradation, Persistence, Wastewater, Estuarine waters, Adsorption

This study focuses on the fate of pharmaceuticals discharged into an estuarine environment, particularly into the Turbidity Maximum Zone (TMZ). Batch experiments were set up to investigate the factors regulating the degradation of 53 selected pharmaceuticals. Treated effluents from Bordeaux city (France) were mixed with water from the estuarine Garonne River during 4 weeks under 6 characterized conditions in order to assess the influence of suspended particulates, sterilization, untreated wastewater input and dilution on the degradation kinetics. Of the 53 pharmaceuticals monitored, 43 were quantified at the initial time. Only 7 exhibited a persistent behavior (e.g. carbamazepine, meprobamate) while biotic degradation was shown to be the main attenuation process for 38 molecules (e.g. abacavir, ibuprofen highly degradable). Degradation was significantly enhanced by increasing concentrations of suspended solids. A persistence index based on the half-lives of the compounds has been calculated for each of the 43 pharmaceuticals to provide a practical estimate of their relative stability. The stability of pharmaceuticals in estuarine environments is likely to be highly variable and attenuated primarily by changes in suspended solid concentration.

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