Comparative hydrochemical analysis of the formation of the mining lakes of As Pontes and Meirama (Spain)

Juncosa, Ricardo; Delgado, J.; Cereijo, José Luis; García, David Granado; Muñóz, A.

doi:10.1007/s10661-018-6880-3

Cited by 10 publications

(1 citation statement)

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“…Lignite mining generated a 2.2-km-long and 1-km-wide water-lled hole sized approximately 146 hm 3 . The maximum depth measured in the lake was 205 m (Juncosa et al, 2018). The lake is the rst mining hole in the world rehabilitated as a water supply reservoir for a large population (Hrdinka, 2005;McCullough and Van Etten, 2011;Vanderberg et al, 2011;World Bank, 2005).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the reduction processes at the bottom of Lake Meirama

Juncosa

Delgado

Cereijo

et al. 2022

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The formation of natural lakes is a process that takes place over thousands of years, although the volumetric formation depends on hydrological and climatological phenomena, reaching a stationary hydraulic regime, the evolution of hydrochemistry is more complex and obeys not only phenomena of stoichiometry and chemical kinetics, but also diffusion processes. Depending on the depth of the lakes, the anoxisation process originating from the bottom is the first phase of the lake's methanogenesis. For this, the course of many thousands of years is necessary, so the studies carried out in the lakes are limited to the current knowledge of the state in which they are, without being able to have real information in this process of methanogenesis. There are no data available on the generation process of a natural lake in its primary stages. In this case, taking advantage of the rehabilitation of the old open-pit mining of Meirama (Northwest Spain), consisting of the controlled flooding of the hole by groundwater, by stopping the perimeter pumping, and the derivation of the nearby streams, whose contribution was the majority with respect to the subterranean contribution, there has been the opportunity to physically and chemically monitor the complete filling of said hole. The present study focuses on the analysis of the evolution of the different processes initiated in the methanogenesis of the lake bottom identified in the well-known Redox ladder: obtaining oxygen from the reduction of nitrogenous compounds and metallic oxides, from the reduction of the sulfate and the generation of methane from carbon compounds, the latter phase without reaching. Although the methanization process is very slow, we have had the opportunity to know the formation of a lake at its origin, from the hydrochemical point of view.

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Section: Introductionmentioning

confidence: 99%