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Enhancing degradation and risk management of emerging organic compounds in managed aquifer recharge systems by means of chaotic advection

Total activity: 3
Type of activity
Competitive project
Funding entity
MIN DE ECONOMIA Y COMPETITIVIDAD
Acronym
INDEMNE
Funding entity code
CGL2015-69768-R
Amount
179.080,00 €
Start date
2016-01-01
End date
2019-06-30
Keywords
artificial recharge, contaminantes emergentes, emerging compounds, geochemical reactions, mezcla, mixing, modelos numéricos, numerical models, reacciones geoquímicas, recarga artificial
Abstract
Managed Artificial Recharge of aquifers (MAR) has been well established as a technology capable of increasing the water resources
storage by enhancing the transfer of water from the ground surface to the underlying aquifer. Moreover, by properly managing the
presence of labile organic carbon, MAR can improve the quality of the mix of recharged and regional groundwater through the enhancing
of reduction-oxidation processes along the infiltration path and in the mixing area. Besides traditional pollutants, Emerging Organic
Compounds (EOCs) have been routinely detected in the recharging water. These compounds are associated with pharmaceutical and
personal care products as well as industrial compounds or pesticides. Importantly, this type of contamination typically consists of a
complex mixture of compounds, each one having a different degradation behavior for a given redox state. In this context, it is necessary to
carefully examine the danger of damaging an aquifer water quality by recharging water containing pollutants (including EOCs). This is
done by properly assessing the risk to sensitive locations. INDEMNE investigates a new strategy aimed to reduce the risk to human health
and ecosystems posed by EOCs in MAR operations. The proposal contends that an engineering sequence of injections and extractions in
the aquifer during MAR operations will increase the contact between the recharging solution and the groundwater, enhancing mixing and
promoting the formation of a broad redox zonation capable to effectively degrade complex mixtures of EOCs. To achieve this, INDEMNE
investigates fundamental processes taking place over multiple scales and develops methods and tools to assess the risk posed by these
contaminants during MAR operations. First, fundamental processes aimed at characterizing the hydro-biochemical processes governing
the fate and transport of EOCs in aquifers will be investigated. In the laboratory, column experiments will be used to analyze processes at
the microscale. The upscaling of processes will be examined by means of intermediate-scale tanks with reconstructed aquifers. This will
allow analyzing the benefits of sequences of injections and extractions under laboratory controlled conditions. Finally, INDEMNE will take advantage of an already equipped field site to assess the new technology in situ. Experimental data will feed mathematical developments
and numerical methods aimed at properly representing hydro-biochemical process of EOCs into reactive transport models. These models
will be incorporated into a new risk-based data driven methodologies that will help decision makers to develop strategies that will minimize
the involved risks to society and environment as well as to reduce the corresponding uncertainties through data acquisition campaigns.
This risk-based framework will allow identifying key factors controlling the risk posed by EOCs and will help analyzing the benefits of
installing a pre-defined optimized sequence of injections and extractions during MAR operations. These risk-based tools will be ultimately
applied in the field to improve the design of a MAR system in the Llobregat Valley.
Scope
Adm. Estat
Plan
Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016
Call year
2016
Funcding program
Programa Estatal de I+D+i Orientada a los Retos de la Sociedad
Funding call
Retos de Investigación: Proyectos de I+D+i
Grant institution
Gobierno De España. Ministerio De Economía Y Competitividad, Mineco

Participants

Scientific and technological production

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