Temperature-dependent redox zonation, nitrate removal and attenuation of organic micropollutants during bank filtration

Munz, Matthias; Oswald, Sascha E.; Schäfferling, Robin; Lensing, Hermann-Josef

doi:10.1016/j.watres.2019.06.041

Cited by 51 publications

(41 citation statements)

References 40 publications

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“…Last but not least, such quantitative information is also required as the basis to interpret the fate of pollutants, e.g. micropollutants (Munz et al 2019), during bank filtration, including their sensitivity to temperature and travel time distributions.…”

Section: Discussionmentioning

confidence: 99%

“…The potential for attenuation and degradation (removal efficiency) of biodegradable compounds and other DOCs depends on the subsurface temperature, redox state, and the evolving microbial community; all of them are site-specific and strongly vary in time. Especially, temperature is recognized to control microbial processes in saturated sediments (Munz et al 2019;Acuña et al 2008;Thamdrup and Fleischer 1998). The more pronounced temperature variation within the aquifer may thus lead to changes in the redox zonation.…”

Section: Influence Of River Reconstruction On Redox Reactionmentioning

confidence: 99%

“…If the subsurface temperature falls below 14°C, biodegradation has been shown to be strongly constrained (Massmann et al 2006;Prommer and Stuyfzand 2005). At an artificial recharge and bank filtration site at Lake Tegel in Berlin and at the site used for this study in Potsdam, Germany, an aerobic condition develops between the river and the pumping well in winter, while in summertime the oxygen is consumed within the first meter below the riverbed followed by the prevailing anaerobic condition (Munz et al 2019;Gross-Wittke et al 2010;Massmann et al 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the quality of water gained via bank filtration depends on subsurface temperature patterns (Munz et al 2019). Temperature is a key factor controlling redox reactions, enzyme activity and biodegradation of organic substances (Maeng et al 2010;Miettinen et al 1996;Umar et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Impact of river reconstruction on groundwater flow during bank filtration assessed by transient three-dimensional modelling of flow and heat transport

et al. 2019

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Bank filtration (BF) is an established indirect water-treatment technology. The quality of water gained via BF depends on the subsurface capture zone, the mixing ratio (river water versus ambient groundwater), spatial and temporal distribution of subsurface travel times, and subsurface temperature patterns. Surface-water infiltration into the adjacent aquifer is determined by the local hydraulic gradient and riverbed permeability, which could be altered by natural clogging, scouring and artificial decolmation processes. The seasonal behaviour of a BF system in Germany, and its development during and about 6 months after decolmation (canal reconstruction), was observed with a long-term monitoring programme. To quantify the spatial and temporal variation in the BF system, a transient flow and heat transport model was implemented and two model scenarios, ‘with’ and ‘without’ canal reconstruction, were generated. Overall, the simulated water heads and temperatures matched those observed. Increased hydraulic connection between the canal and aquifer caused by the canal reconstruction led to an increase of ~23% in the already high share of BF water abstracted by the nearby waterworks. Subsurface travel-time distribution substantially shifted towards shorter travel times. Flow paths with travel times <200 days increased by ~10% and those with <300 days by 15%. Generally, the periodic temperature signal, and the summer and winter temperature extrema, increased and penetrated deeper into the aquifer. The joint hydrological and thermal effects caused by the canal reconstruction might increase the potential of biodegradable compounds to further penetrate into the aquifer, also by potentially affecting the redox zonation in the aquifer.

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Section: Discussionmentioning

confidence: 99%

Section: Influence Of River Reconstruction On Redox Reactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of river reconstruction on groundwater flow during bank filtration assessed by transient three-dimensional modelling of flow and heat transport

et al. 2019

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“…BF systems have proven to be efficient for the removal of turbidity [6][7][8], pathogens [9][10][11], and organic compounds [12][13][14][15]. The efficiency of BF systems to attenuate contaminants is strongly controlled by travel times [13,16] and redox conditions [17][18][19], which in turn depend on numerous site-specific natural and engineered parameters. Natural parameters include the hydrological and hydrogeological conditions, surface and groundwater quality, and prevailing physico-chemical 2.1.2.…”

Section: Introductionmentioning

confidence: 99%

Anthropic and Meteorological Controls on the Origin and Quality of Water at a Bank Filtration Site in Canada

Masse-Dufresne

Baudron

Barbecot

et al. 2019

Water

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At many bank filtration (BF) sites, mixing ratios between the contributing sources of water are typically regarded as values with no temporal variation, even though hydraulic conditions and pumping regimes can be transient. This study illustrates how anthropic and meteorological forcings influence the origin of the water of a BF system that interacts with two lakes (named A and B). The development of a time-varying binary mixing model based on electrical conductivity (EC) allowed the estimation of mixing ratios over a year. A sensitivity analysis quantified the importance of considering the temporal variability of the end-members for reliable results. The model revealed that the contribution from Lake A may vary from 0% to 100%. At the wells that were operated continuously at >1000 m3/day, the contribution from Lake A stabilized between 54% and 78%. On the other hand, intermittent and occasional pumping regimes caused the mixing ratios to be controlled by indirect anthropic and/or meteorological forcing. The flow conditions have implications for the quality of the bank filtrate, as highlighted via the spatiotemporal variability of total Fe and Mn concentrations. We therefore propose guidelines for rapid decision-making regarding the origin and quality of the pumped drinking water.

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The influence of surface–groundwater interactions on nutrient dynamics in urban in-channel treatment systems

Silveira,

Cochrane,

Bello-Mendoza

et al. 2024

Environ Monit Assess

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In-channel water treatment systems remove excess nutrients through biological, chemical, and physical processes associated with the hyporheic zone. However, the impact of surface and groundwater interactions on these treatment processes is poorly understood. This research aims to assess the influence of varying groundwater conditions (neutral, drainage water, and groundwater seepage) and different bed sediment hydraulic conductivities on nitrogen and phosphorus dynamics in in-channel treatment systems. A flume containing bed sediment was used to study changes in surface water quality under different groundwater and bed sediment conditions. Compared to inlet and outlet concentrations, dissolved reactive phosphorus (DRP) and ammoniacal nitrogen (NH4-N) levels in the surface water increased by 11–65% and 10–51%, respectively, while nitrate (NO3-N) concentrations decreased by 11% under groundwater seepage conditions. The increase in NH4-N was due to ammonification, while the decrease in NO3-N was due to denitrification and mixing and dilution with the groundwater. The upward groundwater flux through the bed sediment transported both DRP and NH4-N into the surface water. Low hydraulic (LH) conductivity sediment led to greater changes in nutrient concentration than high hydraulic (HH) conductivity sediment (DRP increased by 65% and NH4-N by 51% for LH, compared to 11% and 10% for HH, respectively). However, HH conductivity sediment led to greater variations in pH and Eh values. The findings could assist the design and monitoring of in-channel treatment systems where groundwater and surface water interact.

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Temperature-dependent redox zonation, nitrate removal and attenuation of organic micropollutants during bank filtration

Cited by 51 publications

References 40 publications

Impact of river reconstruction on groundwater flow during bank filtration assessed by transient three-dimensional modelling of flow and heat transport

Impact of river reconstruction on groundwater flow during bank filtration assessed by transient three-dimensional modelling of flow and heat transport

Anthropic and Meteorological Controls on the Origin and Quality of Water at a Bank Filtration Site in Canada

The influence of surface–groundwater interactions on nutrient dynamics in urban in-channel treatment systems

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