Hydrochemical characterization of a mine water geothermal energy resource in NW Spain

Loredo, C., Ordóñez, A., Garcia-Ordiales, E., Álvarez, R., Roqueñi, N., Cienfuegos, P., Peña, A. and Burnside, N.M. (2017) Hydrochemical characterization of a mine water geothermal energy resource in NW Spain. Science of the Total Environment, 576, pp. 59-69. (doi:10.1016/j.scitotenv.2016.10.084) (PMID:27780100)

[img]
Preview
Text
133059.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

1MB

Abstract

Abandoned and flooded mine networks provide underground reservoirs of mine water that can be used as a renewable geothermal energy source. A complete hydrochemical characterization of mine water is required to optimally design the geothermal installation, understand the hydraulic behavior of the water in the reservoir and prevent undesired effects such as pipe clogging via mineral precipitation. Water pumped from the Barredo-Figaredo mining reservoir (Asturias, NW Spain), which is currently exploited for geothermal use, has been studied and compared to water from a separate, nearby mountain mine and a river that receives mine water discharge and partially infiltrates into the mine workings. Although the hydrochemistry was altered during the flooding process, the deep mine waters are currently near neutral, net alkaline, high metal waters of Na-HCO3 type. Isotopic values suggest that mine waters are closely related to modern meteoric water, and likely correspond to rapid infiltration. Suspended and dissolved solids, and particularly iron content, of mine water results in some scaling and partial clogging of heat exchangers, but water temperature is stable (22 °C) and increases with depth, so, considering the available flow (> 100 L s− 1), the Barredo-Figaredo mining reservoir represents a sustainable, long-term resource for geothermal use.

Item Type:Articles
Additional Information:his work was funded as part of the Low-Carbon After-Life (LoCAL) project under the European Commission Research Fund for Coal and Steel (RFCR-CT-2014-00001). Isotopic analysis was carried out by Adrian Boyce and Alison McDonald at the NERC supported ICSF within the SUERC (NERC Facility contract F14/G6/11/01).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Burnside, Dr Neil
Authors: Loredo, C., Ordóñez, A., Garcia-Ordiales, E., Álvarez, R., Roqueñi, N., Cienfuegos, P., Peña, A., and Burnside, N.M.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Science of the Total Environment
Publisher:Elsevier
ISSN:0048-9697
ISSN (Online):1879-1026
Published Online:22 October 2016
Copyright Holders:Copyright © 2016 Elsevier
First Published:First published in Science of the Total Environment 576:56-69
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

University Staff: Request a correction | Enlighten Editors: Update this record