Dep. Explotación y Prospección de Minas, University of Oviedo, Independencia, 13, 33004 Oviedo, Asturias, Spain.
Dep. Explotación y Prospección de Minas, University of Oviedo, Independencia, 13, 33004 Oviedo, Asturias, Spain.
Sci Total Environ. 2017 Jan 15;576:59-69. doi: 10.1016/j.scitotenv.2016.10.084. Epub 2016 Oct 22.
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-HCO 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 (>100Ls), the Barredo-Figaredo mining reservoir represents a sustainable, long-term resource for geothermal use.
废弃和淹没的矿山网络提供了矿山水的地下水库，可以将其用作可再生地热能资源。需要对矿山水进行全面的水化学特征描述，以优化地热能装置的设计，了解水库中水体的水力行为，并防止因矿物沉淀而导致的不良影响，如管道堵塞。目前正在开采的西班牙西北部阿斯图里亚斯地区的巴雷多-菲格雷多（Barredo-Figaredo）采矿水库中的水已被抽取出来进行研究，并与来自附近另一个矿山和一条接收矿山排水并部分渗透到矿山作业区的河流的水进行了比较。尽管在洪水过程中水质发生了变化，但深部矿山水目前接近中性，呈净碱性，属于 Na-HCO3 型高金属水。同位素值表明，矿山水与现代大气水密切相关，可能对应于快速渗透。矿山水中的悬浮固体和溶解固体，特别是铁含量，导致了一些热交换器的结垢和部分堵塞，但水的温度稳定（22°C），并随深度增加而升高，因此，考虑到可用的流量（>100Ls），巴雷多-菲格雷多采矿水库是一种可持续的、长期的地热能资源。
