Slide 1

Redox gradients in natural & technical systems: Population structure and

physiological properties (H4)

Integral modelling approach for flow and reactive transport at surface

water-groundwater interfaces (N7+H2)

Retention of trace organics in urban hyporheic bioreactors (H1)

Abiotic transformation of organic trace compounds (H3)

Schaper et al. (2018), Water Research 140, 158-166

Broecker et al. (2018), Limnologia 68, 46-68

El-Athman et al. (2018), Environmental Science & Technology, submitted

oxygen freereducedspezies e.g. deiodinated compoundsreduced

e-shuttle

oxidizedspezies

e.g. iodinated compouds

splitting off I

I I

R

R RFe Mn S

corrinoids,humic-, fulvic acids quinones, porhyrins

oxidizede-shuttle

Common topic: Interface urban hyporheic zones

Slide 2

• Attenuation of trace organics (TrOCs) is more efficient in hyporheic zone than surface water

• DOM composition and c(TrOCs) correlate in hyporheic zone, not in surface water

• Lower c(TrOCs) and removal efficiency in summer than in winter

H1: BirgitField sampling campaigns at River Erpe

Results so far:

Overall aim: Keeping/restoring intact hyporheic zone important for attenuation of TrOCs

Seasonality needs to be considered for analyzing whole year removal of TrOCs

Slide 3

H2 + N7: Vahid and TabeaIntegral model for groundwater-surface water interactions

Overall aim: To better understand prevailing flow and transport processes in the interface domain including the exchange processes between the compartments using high resolution simulation

To further develop an integral solver and apply it to cases where interfacial exchanges are crucial (e.g. HZ, coastal engineering) after careful validation using experimental data

To provide new modelling capabilities for questions with combined free and porous media flow as an alternative to coupling of models

Slide 4

• Flow processes in and around chironomid burrow (H2) collaboration with Lewandowski (H1), Nützmann (N6)

H2: VahidIntegral model for groundwater-surface water interactions

Research:

Slide 5

• Flow and transport processes at rippled streambeds (N7) collaboration with Nützmann (N6), Lewandowski (H1)

N7: TabeaIntegral model for groundwater-surface water interactions

Research:

Slide 6

• deiodination under anoxic/anaerobic conditions• the number of cleaved iodine atoms defines the

further behaviour of the TPs e.g. different aerobic biological transformation pathways and sorption to soil, which is also effected by the soil composition (%C-Org, %Clay content)

H3: YukiTransformation and behaviour of iodinated compounds during bank filtration

Results so far:

Overall aim: prediction of contaminant and TPs fate during infiltration (e.g. bank filtration, HZ)

TPs characterization concerning adsorption by soil and during subsequent drinking water treatment

Hypothetical further IOP TP pathway

Slide 7

• Bacterial community in lab-based bioreactors with sediment from hyporheic zone able to transform iopromide under controlled conditions

• Mono-, di- and tri- deiodinated transformation products of the tri-iodinated Iopromide have been detected in outflow suggesting anaerobic microbial transformations

• The transformation of iopromide was shown to be dependent on concentration of organic carbon source suggesting a co-metabolic process

H4: NiranjanRedox gradients in urban water systems: population structure and physiological properties

Results so far:

Overall aim: Exploring the microbial transformation of iopromide by gradient biofilms in lab-scale sediment reactors

Slide 8

Which measurements are conducted where and when?

Surface and pore water (25 cm depth or profiles): Vast sampling campaigns in Sept-Oct 2018, Jan-Feb 2019

and Jul-Aug 2019 19 TrOCs, DOM composition, major cations & anions,

oxygen, temperature, water level, discharge, electric conductivity

Birgit @ Erpe side channel

Yuki @ Lake Tegel & Treatment plant RuhlebenCore samples of 30-40 m depth (Oct 2018): Adsorption tests with ICM Organic content, CNS, XRD, grain size distribution, pHFilter sand of waterworks Tegel (Nov 2019): Batch and column tests with ICMActivated sludge (Apr 2019) Zahn-Wellens-test with ICM

Niranjan @ Erpe side channelSediment samples from the hyporheic zone, 30-40cm (Mar&Apr 2019): Column tests with iopromide

Slide 9

KEY PROCESSESWATER BALANCE

COMPONENT

WHO USED MODEL

Surface runoff H2+N7 OpenFOAM

Infiltration H2+N7 OpenFOAM

Groundwater recharge H2+N7 OpenFOAM

Contaminations H2+N7 OpenFOAM

Which models are used to represent which water balance component?

Slide 10

Collaborations within HZ group (without first supervisors)

Field workLab analysisShared dataModellingPublication

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123 123

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Slide 11

What we offer!• Help with sample analysis (major cations & anions, trace organic contaminants,

DOC, SAK)• Microbial community analysis (sequencing, photometry, flow cytometry, light-,

fluorescence- and confocal laser scanning microscopy, fluorescence in-situhybridisation, quantitative real time polymerase chain reaction (qPCR))

• Oxygen, temperature, electric conductivity measurement • OpenFOAM introduction, Integral flow and transport model for ground- and

surface water (high resolutions results for pressure distributions, flow paths, tracer concentrations)

• Field work devices and advice

Slide 12

What we need!• Field data for model validation: Flow and transport processes at the

groundwater-surface water interface (including porosities, grain sizes, velocities, tracer concentrations, water levels)

• Iodide/iodine species detection in the range of ng/L to lower µg/L• Heavy/Transition Metal Analysis• Dissolved Oxygen Measurements• Anion analysis DOC measurements

Slide 13

Where can we cooperate better?

• Share more data and publish together• Sharing results

• H3 and H4 collaborate on overlapping points

Slide 14

Common Publications, ConferencesRealized publications:• Broecker, T., Teuber, K., Sobhi Gollo, V., Nützmann, G., Lewandowski, J. & Hinkelmann, R. (2019).

Integral Flow Modelling Approach for Surface Water-Groundwater Interactions along a RippledStreambed. Water, 11(7), 1517.

• Lewandowski, J., Arnon, S., Banks, E., Batelaan, O., Betterle, A., Broecker, T., Coll, C., Drummond, J.D., Gaona Garcia, J., Galloway, J., Gomez-Velez, J., Grabowski, R.C., Herzog, S.P., Hinkelmann, R., Höhne, A., Hollender, J., Horn, M.A., Jaeger, A., Krause, S., Löchner Prats, A., Magliozzi, C., Meinikmann, K., Mojarrad, B.B., Mueller, B.M., Peralta-Maraver, I., Popp, A.L., Posselt, M., Putschew, A., Radke, M., Raza, M., Riml, J., Robertson, A., Rutere, C., Schaper, J.L., Schirmer, M., Schulz, H., Shanafield, M., Singh, T., Ward, A.S., Wolke, P., Wörman, A. & Wu, L. (2019). Is theHyporheic Zone Relevant beyond the Scientific Community? Water, 11(11), 2230

• Sobhi Gollo, V., Broecker, T., Lewandowski, J., Nützmann, G. & Hinkelmann, R. (2019). Comparisonof an integral solver to coupled modelling approach for hydraulic exchange at surface water-groundwater interface along rippled streambed, EGU General Assembly, Vienna, Austria.

Slide 15

Planned publications:• Augustyniak, A., Sikora, P., Grygorcewicz, B., Despot, D., Braun, B., Szewzyk, U.,

Barjenbruch, M., Stephan, D. (in preparation, planned submission July 2020). Biofilms in the gravity sewer interfaces – making a friend from a foe.

• Broecker, T., Sobhi Gollo, V., Fox, A., Lewandowski, J., Nützmann, G. & Hinkelmann, R. Integral, high resolution transport modelling approach for surface water-groundwater interaction (planned submission to Water Resources Research 2020).

• Mueller, B. M., Schulz, H., Putschew A., Danczak, R. E., Lewandowski, J. (planned for 2020). Attenuation of trace organic compounds and dissolved organic matter in the surface water and the hyporheic zone of a lowland river.

• Sobhi Gollo, V., Broecker, T., Lewandowski, J., Nützmann, G. & Hinkelmann, R. Integral modeling of flow in and around a ventilated U-shaped chironomid burrow (planned submission to Water Resources Research 2020).

• Sorgler, Y., Schaper, J., Kerl, C., Putschew, A., Planer-Friedrich, B. (in preparation, planned submission August 2020). Fate and transformation of iodinated compounds in the hyporheic zone.

• UWI conference