The impact of variably saturated conditions on hydrogeochemical changes during artificial recharge of groundwater

Greskowiak, Janek; Prommer, Henning; Massmann, Gudrun; Johnston, Colin D.; Nützmann, Gunnar; Pekdeger, A.

doi:10.1016/j.apgeochem.2005.03.002

Cited by 107 publications

(94 citation statements)

References 66 publications

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“…Groundwater quality can also be improved when contaminants, such as nitrate, are removed from infiltrating water during MAR (Greskowiak et al, 2005;Schmidt et al, 2011b). Nitrate is a pervasive contaminant in many agricultural basins, yet it is challenging to remove from shallow groundwater (B€ ohlke and Denver, 1995;Fryar et al, 2000;B€ ohlke et al, 2002;Burow et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Coupling distributed stormwater collection and managed aquifer recharge: Field application and implications

Beganskas

Fisher

2017

Journal of Environmental Management

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Section: Discussionmentioning

confidence: 99%

Coupling distributed stormwater collection and managed aquifer recharge: Field application and implications

Beganskas

Fisher

2017

Journal of Environmental Management

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“…Both sites have been previously studied [2,5,16]. The lake sediment cores L1 and L2 were taken from the sandy and non-vegetated riparian zone which is surrounded by trees at a water depth at approximately 0.2 m. A column (acrylic glass, 65 mm inner diameter) was pushed into the sediment and sealed with a plug to remove the core.…”

Section: Sediment Coresmentioning

confidence: 99%

Impacts of Accumulated Particulate Organic Matter on Oxygen Consumption and Organic Micro-Pollutant Elimination in Bank Filtration and Soil Aquifer Treatment

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Jekel

Ruhl

2017

Water

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Bank filtration (BF) and soil aquifer treatment (SAT) are efficient natural technologies in potable water reuse systems. The removal of many organic micro-pollutants (OMPs) depends on redox-conditions in the subsoil, especially on the availability of molecular oxygen. Due to microbial transformation of particulate and dissolved organic constituents, oxygen can be consumed within short flow distances and induce anoxic and anaerobic conditions. The effect of accumulated particulate organic carbon (POC) on the fate of OMPs in BF and SAT systems is not fully understood. Long-term column experiments with natural sediment cores from the bank of Lake Tegel and from a SAT basin were conducted to investigate the impact of accumulated POC on dissolved organic carbon (DOC) release, on oxygen consumption, on mobilization of iron and manganese, and on the elimination of the organic indicator OMPs. The cores were fed with aerated tap water spiked with OMPs to exclude external POC inputs. Complete oxygen consumption within the first infiltration decimeter in lake sediments caused mobilization of iron, manganese, and DOC. Redox-sensitive OMPs like diclofenac, sulfamethoxazole, formylaminoantipyrine, and gabapentin were eliminated by more than 50% in all sediment cores, but slightly higher residual concentrations were measured in effluents from lake sediments, indicating a negative impact of a high oxygen consumption on OMP removal.

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“…Water quality is enhanced during passage through soil (Bouwer, 2002;Greskowiak et al, 2005) because the passage causes reduction not only in turbidity and suspended matter, but also in the concentrations of dissolved organic matter (Vanderzalm et al, 2006), nutrients (Bekele et al, 2011), pathogens , and some trace organic contaminants Hoppe-Jones et al, 2010;Valhondo et al, 2014Valhondo et al, , 2015. The appropriate management of artificial recharge systems requires an understanding of the fate of the potential contaminants.…”

Section: Introductionmentioning

confidence: 99%

Tracer test modeling for characterizing heterogeneity and local-scale residence time distribution in an artificial recharge site

Valhondo

Martinez-Landa

Carrera

et al. 2016

Hydrol. Earth Syst. Sci.

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Abstract. Artificial recharge of aquifers is a technique for improving water quality and increasing groundwater resources. Understanding the fate of a potential contaminant requires knowledge of the residence time distribution (RTD) of the recharged water in the aquifer beneath. A simple way to obtain the RTDs is to perform a tracer test. We performed a pulse injection tracer test in an artificial recharge system through an infiltration basin to obtain the breakthrough curves, which directly yield the RTDs. The RTDs turned out to be very broad and we used a numerical model to interpret them, to characterize heterogeneity, and to extend the model to other flow conditions. The model comprised nine layers at the site scaled to emulate the layering of aquifer deposits. Two types of hypotheses were considered: homogeneous (all flow and transport parameters identical for every layer) and heterogeneous (diverse parameters for each layer). The parameters were calibrated against the head and concentration data in both model types, which were validated quite satisfactorily against 1,1,2-Trichloroethane and electrical conductivity data collected over a long period of time with highly varying flow conditions. We found that the broad RTDs can be attributed to the complex flow structure generated under the basin due to three-dimensionality and time fluctuations (the homogeneous model produced broad RTDs) and the heterogeneity of the media (the heterogeneous model yielded much better fits). We conclude that heterogeneity must be acknowledged to properly assess mixing and broad RTDs, which are required to explain the water quality improvement of artificial recharge basins.

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The impact of variably saturated conditions on hydrogeochemical changes during artificial recharge of groundwater

Cited by 107 publications

References 66 publications

Coupling distributed stormwater collection and managed aquifer recharge: Field application and implications

Coupling distributed stormwater collection and managed aquifer recharge: Field application and implications

Impacts of Accumulated Particulate Organic Matter on Oxygen Consumption and Organic Micro-Pollutant Elimination in Bank Filtration and Soil Aquifer Treatment

Tracer test modeling for characterizing heterogeneity and local-scale residence time distribution in an artificial recharge site

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