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| Titel |
Monitoring technologies for the evaluation of a Soil-Aquifer-Treatment system in coastal aquifer environments. |
| VerfasserIn |
Andreas Kallioras, Athanasia Tsertou, Laura Foglia, Jan Bumberger, Thomas Vienken, Peter Dietrich, Christoph Schüth |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250100755
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| Publikation (Nr.) |
 EGU/EGU2014-16748.pdf |
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| Zusammenfassung |
| Artificial recharge of groundwater has an important role to play in water reuse. Treated
sewage effluent can be infiltrated into the ground for recharge of aquifers. As the effluent
water moves through the soil and the aquifer, it undergoes significant quality improvements
through physical, chemical, and biological processes in the underground environment.
Collectively, these processes and the water quality improvement obtained are called
soil-aquifer-treatment (SAT) or geopurification. Recharge systems for SAT can be designed
as infiltration-recovery systems, where all effluent water is recovered as such from the
aquifer, or after blending with native groundwater. SAT typically removes essentially all
suspended solids, biochemical oxygen demand (BOD), and pathogens (viruses, bacteria,
protozoa, and helminthic eggs). Concentrations of synthetic organic carbon, phosphorous,
and heavy metals are greatly reduced.
The pilot site of LTCP will involve the employment of infiltration basins, which will
be using waters of impaired quality as a recharge source, and hence acting as a
Soil-Aquifer-Treatment, SAT, system.
T he LTCP site will be employed as a pilot SAT system complemented by new
technological developments, which will be providing continuous monitoring of the
quantitative and qualitative characteristics of infiltrating groundwater through all
hydrologic zones (i.e. surface, unsaturated and saturated zone). This will be achieved
through the development and installation of an integrated system of prototype sensors,
installed on-site, and offering a continuous evaluation of the performance of the SAT
system.
An integrated approach of the performance evaluation of any operating SAT system
should aim at parallel monitoring of all hydrologic zones, proving the sustainability of
all involved water quality treatment processes within unsaturated and saturated
zone.
Hence a prototype system of Time Domain Reflectometry (TDR) sensors will be
developed, in order to achieve continuous quantitative monitoring of the unsaturated zone
through the entire soil column down to significant depths below the SAT basin. The above
technique will offer continuous monitoring of infiltration rates and possible mechanical
clogging effects. The qualitative monitoring of the unsaturated zone will be achieved
through the installation of appropriate pore-water samplers within a multi-level
basis, ensuring repeatability of sampling of infiltrating water of impaired quality.
This study also involves the qualitative and quantitative assessment of the Lavrion
multi-aquifer system through continuous monitoring of the performance of (i) the
alluvial aquifer and its potential for additional water treatment as well as (ii) the
effects of the SAT system for countermeasuring seawater intrusion in the area of
Lavrion. Additionally, setup and calibration of numerical flow and transport models for
evaluating and optimizing different operational modes of the SAT system within both
saturated and unsaturated zones will be conducted. The monitoring system will be
connected to an ad-hoc wireless network for continuous data transfer within the SAT
facilities.
It is envisaged that the development and combined application of all the above
technologies will provide an integrated monitoring platform for the evaluation of SAT system
performance. |
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