Verteilung anthropogen eingetragener Stoffe im Grundwasser: Ein Fallbeispiel aus der Nordschweiz

Moeck, Christian; Radny, Dirk; Huggenberger, Peter; Affolter, Annette; Auckenthaler, Adrian; Hollender, Juliane; Berg, Michael; Schirmer, Mario

doi:10.1007/s00767-018-0403-6

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…Compounds with chlorine atoms are among the more toxic organic compounds frequently appearing in soil and groundwater [6,7]. Between these chlorinated organic compounds (COCs), chlorobenzenes (nCBs, (n = mono, di, tri, tetra)) are commonly chlorinated pollutants in soil and groundwater [8].…”

Section: Introductionmentioning

confidence: 99%

Wet Peroxide Oxidation of Chlorobenzenes Catalyzed by Goethite and Promoted by Hydroxylamine

et al. 2019

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In this work, the abatement of several chlorobenzenes commonly found as pollutants in the aqueous phase has been carried out by catalytic wet peroxide oxidation using goethite as the catalyst and hydroxylamine as the promotor. Spiked water with monochlorobenzene and different positional isomers of dichlorobenzene, trichlorobenzene, and tetrachlorobenzene, at concentrations ranging from 0.4 to 16.9 mg L−1 was treated. Runs were carried out batch-way, at room conditions, without headspace. The heterogeneous catalyst was commercial goethite, with a specific surface area (SBET) of 10.24 m2 g−1 and a total iron content of 57.3 wt%. Iron acts as a catalyst of hydrogen peroxide decomposition to hydroxyl radicals. Hydroxylamine (in a range from 0 to 4.9 mM) was added to enhance the iron redox cycle from Fe (III) to Fe (II), remarkably increasing the radical production rate and therefore, the conversion of chlorobenzenes. Iron was stable (not leached to the aqueous phase) even at the lowest pH tested (pH = 1). The effect of pH (from 2 to 7), hydrogen peroxide (from 1 to 10 times the stoichiometric dosage), hydroxylamine, and catalyst concentration (from 0.25 to 1 g/L) was studied. Pollutant removal increased with hydroxylamine and hydrogen peroxide concentration. An operating conditions study demonstrated that the higher the hydroxylamine and hydrogen peroxide concentrations, the higher the removal of pollutants. The optimal pH value and catalyst concentration was 3 and 0.5 g L−1, respectively. Operating with 2.4 mM of hydroxylamine and 10 times the stoichiometric H2O2 amount, a chlorobenzenes conversion of 90% was achieved in 2.5 h. Additionally, no toxic byproducts were obtained.

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Section: Introductionmentioning

confidence: 99%

Wet Peroxide Oxidation of Chlorobenzenes Catalyzed by Goethite and Promoted by Hydroxylamine

et al. 2019

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“…Morphologically, the carbonate units on the edges of the Rhine Valley within the Tabular Jura represent the recharge area of the basin. Although many aspects of the system dynamics at different scales are not yet well understood, several projects, which have focused on groundwater management and quality issues within the karst and shallow alluvial aquifer systems, offer some insight into the complexity of the multi-scale flow systems (Huggenberger et al 2010;Moeck et al 2018;Spottke et al 2005;Zechner et al 2011).…”

Section: Geological Setting and Aquifer Unitsmentioning

confidence: 99%

Regional groundwater flow and karst evolution–theoretical approach and example from Switzerland

et al. 2021

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In regional scale aquifers in the Rhine Valley and Tabular Jura east of Basel (Switzerland), the groundwater circulation was investigated using regional-scale geological and hydraulic 3D models. The main aquifers in the area comprise the Quaternary aquifer of unconsolidated gravel deposits along the River Rhine and its tributaries, as well as the regional scale karst aquifer within the Upper Muschelkalk. Land subsidence, a process likely associated with salt solution mining, indicates further subordinate groundwater bearing segments and complex groundwater interactions along fault zones. In the aquifer systems we investigated, regional-scale groundwater circulation was simulated and visualized in relation to the geological settings. Lithostratigraphic units and fault structures were parameterized and analyzed, including the sensitivity of hydraulic properties and boundaries. Scenario calculations were used to investigate the sensitivity that the aquifer systems had to hydraulic parameter changes during Quaternary aggradation and degradation in the main valley. Those calculations were also done for base-level changes in the Rivers Rhine and Birs. For this purpose, this study considered probable historic base-levels before river regulation occurred, and before river dams and power plants were constructed. We also focused on scenarios considering increased groundwater recharge rates, e.g. due to exceptional long-lasting precipitation, or heavy rainfall events in the catchment area. Our results indicate that increased groundwater recharge rates in the catchment areas during such events (or periods) are associated with orders of magnitude increases of regional inflow into the Upper Muschelkalk karst aquifer. Furthermore, the groundwater fluctuations and groundwater saturated regions within the karst aquifer shift to places where high densities of sinkholes are documented. When the surface water base-levels adapt to probable historic levels, it leads to increased hydraulic gradients (i.e. local lowering of the groundwater level by up to 7 m). Those increased gradients are associated with increased groundwater flow within some aquifer regions that are particularly prone to karst development.

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Eine Echtzeit-Online-Methode zur Beurteilung der künstlichen Grundwasseranreicherung und Grundwasserentnahme

Moeck

Merk

Radny

et al. 2022

Grundwasser - Zeitschrift der Fachsektion Hydrogeologie

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ZusammenfassungEine nachhaltige Wasserversorgung in urbanen Gebieten stellt aufgrund des Nutzungsdrucks sowie vielfältiger anthropogener Einträge eine große Herausforderung dar. Künstliche Grundwasseranreicherung hat das Potenzial, den Wasserbedarf zu decken und ggf. vorhandene Schadstoffkonzentrationen zu verdünnen. Durch hohe Infiltrationsraten kann zudem eine hydraulische Barriere gegenüber Schadstoffen aus anliegenden Nutzungsflächen entstehen. Grundvoraussetzung, um diese Barriere so effektiv wie möglich nutzen zu können, ist die genaue Beschreibung der räumlichen und zeitlichen Verteilung der Schutzfunktion. Im geschilderten Fallbeispiel für ein Trinkwassergewinnungsgebiet in der Nordschweiz präsentieren wir ein einfaches Online-Werkzeug. Es wird genutzt, um die große Menge der erhobenen Daten zu digitalisieren sowie um die Interpretation von Konturenkarten zu ergänzen, indem es die Auswertung erhobener Daten vereinfacht und Grundwasserfließrichtungen und -magnituden visualisiert. Die Ergebnisse können zur Beschreibung komplexerer Fließsysteme genutzt werden, was zu einer effizienteren Grundwasserbeobachtung führt.

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Verteilung anthropogen eingetragener Stoffe im Grundwasser: Ein Fallbeispiel aus der Nordschweiz

Cited by 4 publications

References 30 publications

Wet Peroxide Oxidation of Chlorobenzenes Catalyzed by Goethite and Promoted by Hydroxylamine

Wet Peroxide Oxidation of Chlorobenzenes Catalyzed by Goethite and Promoted by Hydroxylamine

Regional groundwater flow and karst evolution–theoretical approach and example from Switzerland

Eine Echtzeit-Online-Methode zur Beurteilung der künstlichen Grundwasseranreicherung und Grundwasserentnahme

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