Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes

Abstract Urban streams receive increasing loads of organic micropollutants from treated wastewaters. A comprehensive understanding of the in-stream fate of micropollutants is thus of high interest for water quality management. Bedforms induce pumping effects considerably contributing to whole stream...

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Autores principales:	Anna Jaeger, Malte Posselt, Jonas L. Schaper, Andrea Betterle, Cyrus Rutere, Claudia Coll, Jonas Mechelke, Muhammad Raza, Karin Meinikmann, Andrea Portmann, Phillip J. Blaen, Marcus A. Horn, Stefan Krause, Jörg Lewandowski
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c3e1cf3652f449958b510ea2d863f00e
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spelling	oai:doaj.org-article:c3e1cf3652f449958b510ea2d863f00e2021-12-02T17:14:24ZTransformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes10.1038/s41598-021-91519-22045-2322https://doaj.org/article/c3e1cf3652f449958b510ea2d863f00e2021-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-91519-2https://doaj.org/toc/2045-2322Abstract Urban streams receive increasing loads of organic micropollutants from treated wastewaters. A comprehensive understanding of the in-stream fate of micropollutants is thus of high interest for water quality management. Bedforms induce pumping effects considerably contributing to whole stream hyporheic exchange and are hotspots of biogeochemical turnover processes. However, little is known about the transformation of micropollutants in such structures. In the present study, we set up recirculating flumes to examine the transformation of a set of micropollutants along single flowpaths in two triangular bedforms. We sampled porewater from four locations in the bedforms over 78 days and analysed the resulting concentration curves using the results of a hydrodynamic model in combination with a reactive transport model accounting for advection, dispersion, first-order removal and retardation. The four porewater sampling locations were positioned on individual flowpaths with median solute travel times ranging from 11.5 to 43.3 h as shown in a hydrodynamic model previously. Highest stability was estimated for hydrochlorothiazide on all flowpaths. Lowest detectable half-lives were estimated for sotalol (0.7 h) and sitagliptin (0.2 h) along the shortest flowpath. Also, venlafaxine, acesulfame, bezafibrate, irbesartan, valsartan, ibuprofen and naproxen displayed lower half-lives at shorter flowpaths in the first bedform. However, the behavior of many compounds in the second bedform deviated from expectations, where particularly transformation products, e.g. valsartan acid, showed high concentrations. Flowpath-specific behavior as observed for metformin or flume-specific behavior as observed for metoprolol acid, for instance, was attributed to potential small-scale or flume-scale heterogeneity of microbial community compositions, respectively. The results of the study indicate that the shallow hyporheic flow field and the small-scale heterogeneity of the microbial community are major controlling factors for the transformation of relevant micropollutants in river sediments.Anna JaegerMalte PosseltJonas L. SchaperAndrea BetterleCyrus RutereClaudia CollJonas MechelkeMuhammad RazaKarin MeinikmannAndrea PortmannPhillip J. BlaenMarcus A. HornStefan KrauseJörg LewandowskiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-18 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Anna Jaeger Malte Posselt Jonas L. Schaper Andrea Betterle Cyrus Rutere Claudia Coll Jonas Mechelke Muhammad Raza Karin Meinikmann Andrea Portmann Phillip J. Blaen Marcus A. Horn Stefan Krause Jörg Lewandowski Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
description	Abstract Urban streams receive increasing loads of organic micropollutants from treated wastewaters. A comprehensive understanding of the in-stream fate of micropollutants is thus of high interest for water quality management. Bedforms induce pumping effects considerably contributing to whole stream hyporheic exchange and are hotspots of biogeochemical turnover processes. However, little is known about the transformation of micropollutants in such structures. In the present study, we set up recirculating flumes to examine the transformation of a set of micropollutants along single flowpaths in two triangular bedforms. We sampled porewater from four locations in the bedforms over 78 days and analysed the resulting concentration curves using the results of a hydrodynamic model in combination with a reactive transport model accounting for advection, dispersion, first-order removal and retardation. The four porewater sampling locations were positioned on individual flowpaths with median solute travel times ranging from 11.5 to 43.3 h as shown in a hydrodynamic model previously. Highest stability was estimated for hydrochlorothiazide on all flowpaths. Lowest detectable half-lives were estimated for sotalol (0.7 h) and sitagliptin (0.2 h) along the shortest flowpath. Also, venlafaxine, acesulfame, bezafibrate, irbesartan, valsartan, ibuprofen and naproxen displayed lower half-lives at shorter flowpaths in the first bedform. However, the behavior of many compounds in the second bedform deviated from expectations, where particularly transformation products, e.g. valsartan acid, showed high concentrations. Flowpath-specific behavior as observed for metformin or flume-specific behavior as observed for metoprolol acid, for instance, was attributed to potential small-scale or flume-scale heterogeneity of microbial community compositions, respectively. The results of the study indicate that the shallow hyporheic flow field and the small-scale heterogeneity of the microbial community are major controlling factors for the transformation of relevant micropollutants in river sediments.
format	article
author	Anna Jaeger Malte Posselt Jonas L. Schaper Andrea Betterle Cyrus Rutere Claudia Coll Jonas Mechelke Muhammad Raza Karin Meinikmann Andrea Portmann Phillip J. Blaen Marcus A. Horn Stefan Krause Jörg Lewandowski
author_facet	Anna Jaeger Malte Posselt Jonas L. Schaper Andrea Betterle Cyrus Rutere Claudia Coll Jonas Mechelke Muhammad Raza Karin Meinikmann Andrea Portmann Phillip J. Blaen Marcus A. Horn Stefan Krause Jörg Lewandowski
author_sort	Anna Jaeger
title	Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
title_short	Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
title_full	Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
title_fullStr	Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
title_full_unstemmed	Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
title_sort	transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c3e1cf3652f449958b510ea2d863f00e
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Transformation of organic micropollutants along hyporheic flow in bedforms of river-simulating flumes

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