title: Temperature dependent redox zonation and attenuation of wastewater-derived organic micropollutants in the hyporheic zone.
abstract: The hyporheic zone - a spatially fluctuating ecotone connecting surface water and groundwater - is considered to be highly reactive with regard to the attenuation of organic micropollutants. In the course of the presented study an undisturbed sediment core was taken from the infiltration zone of a bank filtration site in Berlin and operated under controlled laboratory conditions with wastewater-influenced surface water at two different temperatures, simulating winter and summer conditions. The aim was to evaluate the fate of site-relevant micropollutants, namely metoprolol, iopromide, diclofenac, carbamazepine, acesulfame, tolyltriazole, benzotriazole, phenazone and two phenazone type metabolites, within the first meter of infiltration dependent on the prevailing temperature. A change in temperature resulted in a development of significantly distinct redox conditions. Both temperature dependencies and related redox dependencies were identified for all micropollutants except for benzotriazole and carbamazepine, which behaved persistent under all conditions. For the remaining compounds degradation rate constants generally decreased from warm and oxic/penoxic/suboxic over cold and oxic/penoxic to warm and manganese reducing (transition zone). Individual degradation rate constants ranged from 0 (e.g. diclofenac, acesulfame and tolyltriazole in the transition zone) to 1.4×10(-4)s(-1) for metoprolol under warm conditions within the oxic to suboxic zone.
authors.affiliation: Carl von Ossietzky University of Oldenburg, Department of Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111 Oldenburg, Germany. Electronic address: victoria.burke@uni-oldenburg.de.
authors.forename: Victoria
authors.initials: V
authors.lastname: Burke
authors.affiliation: Carl von Ossietzky University of Oldenburg, Department of Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111 Oldenburg, Germany.
authors.forename: Janek
authors.initials: J
authors.lastname: Greskowiak
authors.affiliation: Carl von Ossietzky University of Oldenburg, Department of Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111 Oldenburg, Germany.
authors.forename: Tina
authors.initials: T
authors.lastname: Asmuß
authors.affiliation: Carl von Ossietzky University of Oldenburg, Department of Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111 Oldenburg, Germany.
authors.forename: Rebecca
authors.initials: R
authors.lastname: Bremermann
authors.affiliation: Freie Universität Berlin, Institute of Geological Sciences, Malteserstr. 74-100, 12249 Berlin, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Taute
authors.affiliation: Carl von Ossietzky University of Oldenburg, Department of Biology and Environmental Sciences, Working Group Hydrogeology and Landscape Hydrology, D-26111 Oldenburg, Germany.
authors.forename: Gudrun
authors.initials: G
authors.lastname: Massmann
mesh_terms: D001604:Berlin; D004784:Environmental Monitoring; D060587:Groundwater / Q000737:chemistry; D010084:Oxidation-Reduction; D045483:Rivers / Q000737:chemistry; D012621:Seasons; D013696:Temperature; D062065:Wastewater / Q000032:analysis*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Bank filtration; Biodegradation; Column experiments; Industrial agents; Pharmaceuticals; Redox conditions