Sediment–Water Distribution and Benthic Boundary Layer Fluxes of Pharmaceuticals and Personal Care Products near Wastewater Discharge into a Tidal River Shoal

Pharmaceuticals and personal care products (PPCPs) were measured in porewater, sediment, and surface water at three sites near wastewater treatment plant (WTP) discharge along a 2 km downstream transect in a tributary shoal embayment (Alexandria, VA) of the tidal Potomac River. A benthic diffusion l...

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Veröffentlicht in:ACS ES&T water 2021-06, Vol.1 (6), p.1447-1455
Hauptverfasser: Foster, Gregory D, Leahigh, Arion
Format: Artikel
Sprache:eng
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Zusammenfassung:Pharmaceuticals and personal care products (PPCPs) were measured in porewater, sediment, and surface water at three sites near wastewater treatment plant (WTP) discharge along a 2 km downstream transect in a tributary shoal embayment (Alexandria, VA) of the tidal Potomac River. A benthic diffusion layer model evaluated water-only, dissolved organic carbon (DOC)-associated, and bioturbation mass transport pathways. Fluxes of 17 PPCPs nearest the WTP were all in the direction of surface water to sediment porewater (negative) with magnitudes of −0.0016 to −7.4 ng m–2 s–1. At the next downstream site, fluxes of seven PPCPs were bidirectional (negative and positive) and ranged from −4.8 × 10–4 to 0.0051 ng m–2 s–1. The furthest site downstream yielded fluxes of six PPCPs that were predominantly sediment to water (positive), ranging in magnitude from −0.0020 to 7.0 × 10–4 ng m–2 s–1. The bioturbation and water-only mass transport coefficients contributed most to fluxes for PPCPs. The DOC-associated mass transport term was negligible. The fluxes indicated sediments will continue serve as a source of PPCPs 2 km downstream from WTP discharge.
ISSN:2690-0637
2690-0637
DOI:10.1021/acsestwater.1c00028