Article (Scientific journals)
Hydrochemical changes induced by underground pumped storage hydropower and their associated impacts
Pujades, Estanis; Jurado, Anna; Orban, Philippe et al.
2018In Journal of Hydrology, 563, p. 927-941
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The final published paper is available at https://doi.org/10.1016/j.jhydrol.2018.06.041


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Keywords :
energy storage; UPSH; groundwater interaction; hydrochemistry evolution; underground reservoir; environmental impact; efficiency
Abstract :
[en] Underground pumped storage hydropower (UPSH) using abandoned mines is an alternative system to manage electricity production in flat regions. Water from an underground reservoir is pumped to a surface reservoir to store electricity in the form of potential energy. Later, water is discharged through turbines into the underground reservoir to produce electricity when demand increases. During this operation, the water hydrochemistry continuously evolves. It varies in order to reach chemical equilibrium with the atmosphere (in the surface reservoir) and with the surrounding porous medium and groundwater (in the underground reservoir). The hydrochemical variations may lead to reactions in the reservoirs and in the surrounding porous medium, causing potentially negative consequences for the environment and the system efficiency, especially when pyrite is present in the surrounding porous medium. In this case, pyrite oxidation leads to a decrease in pH and the precipitation of goethite or schwertmannite in the surface reservoir. The decrease in pH is mitigated when calcite is present in the porous medium. However, other concerns may arise, such as slight increases in pH, the precipitation of ferrihydrite and calcite in the surface reservoir, and the oxidation of pyrite and dissolution of calcite in the surrounding porous medium. Understanding the pH variations and the precipitation/dissolution of minerals is of paramount importance in terms of the environmental impacts and system efficiency. For this reason, this work investigates the main hydrochemical changes and their associated consequences when abandoned deep mines are used for UPSH by means of numerical modelling. The main objective is to highlight the importance of considering hydrochemical aspects when designing future UPSH plants.
Research center :
UEE - Urban and Environmental Engineering - ULiège
Disciplines :
Geological, petroleum & mining engineering
Author, co-author :
Pujades, Estanis;  UFZ – Helmholtz Centre for Environmental Research, Leipzig, Germany > Department of Computational Hydrosystems
Jurado, Anna;  Technische Universität Dresden, Dresden, Germany > Institute for Groundwater Management
Orban, Philippe  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Ayora, Carlos;  CSIC, Barcelona, Spain > Institute of Environmental Assessment & Water Research (IDAEA) > GHS
Poulain, Angélique;  Université de Mons - UMONS > Geology and Applied Geology
Goderniaux, Pascal;  Université de Mons - UMONS > Geology and Applied Geology
Brouyère, Serge  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Dassargues, Alain  ;  Université de Liège - ULiège > Département ArGEnCo > Hydrogéologie & Géologie de l'environnement
Language :
English
Title :
Hydrochemical changes induced by underground pumped storage hydropower and their associated impacts
Publication date :
04 June 2018
Journal title :
Journal of Hydrology
ISSN :
0022-1694
eISSN :
1879-2707
Publisher :
Elsevier, Netherlands
Volume :
563
Pages :
927-941
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 600405 - BEIPD - Be International Post-Doc - Euregio and Greater Region
Name of the research project :
SMARTWATER
Funders :
University of Liège and the EU through the Marie Curie BeIPD-COFUND postdoctoral fellowship programme (2014-2016 and 2015-2017 “Fellows from FP7-MSCA-COFUND, 600405”
Public Service of Wallonia – Department of Energy and Sustainable Building through the Smartwater project
CE - Commission Européenne [BE]
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since 24 July 2018

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