Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan

If the excavated underground veins are not backfilled, they may be a factor in the continued outflow of acid mine drainage (AMD). The flow rate of AMD can be reduced by backfilling underground drifts from abandoned mines. In addition, the quality of AMD may be improved as the flow rate of AMD reduce...

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Autores principales:	Kohei Yamaguchi, Shingo Tomiyama, Toshifumi Igarashi, Saburo Yamagata, Masanori Ebato, Masatoshi Sakoda
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	AMD backfilling geochemical analysis pyrite dissolved oxygen Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/ed4fb8f8063a4e579ddc0e715ebdf2ee
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spelling	oai:doaj.org-article:ed4fb8f8063a4e579ddc0e715ebdf2ee2021-11-25T18:26:56ZImprovement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan10.3390/min111112972075-163Xhttps://doaj.org/article/ed4fb8f8063a4e579ddc0e715ebdf2ee2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1297https://doaj.org/toc/2075-163XIf the excavated underground veins are not backfilled, they may be a factor in the continued outflow of acid mine drainage (AMD). The flow rate of AMD can be reduced by backfilling underground drifts from abandoned mines. In addition, the quality of AMD may be improved as the flow rate of AMD reduces. In this paper, the quality of the AMD after backfilling was evaluated by a three-dimensional geochemical analysis model when the groundwater level was recovered after backfilling. The measured dissolved iron (Fe) and sulfate ion (SO<sub>4</sub><sup>2−</sup>) concentrations and pH before backfilling the drift were reproduced by the calibration of the simulation. Using the calibrated model, the pH at the outlet of the drift was changed from about pH 3 before backfilling to about pH 4 to 5 after backfilling. When calcite was contained in the filling materials of the drift, the pH approached neutral. However, when gypsum was formed, the neutralization was inhibited. The Fe concentration discharged from the drift was calculated at approximately 0.002 mol/L before backfilling. The total Fe concentration was calculated at 0.0004 mol/L or less after backfilling, and the dissolved Fe concentration decreased by several orders of magnitude after backfilling. A geochemical model quantitatively evaluated the improvement in water quality after backfilling the drifts. This method can be applied to the other abandoned mines with similar hydrogeological conditions.Kohei YamaguchiShingo TomiyamaToshifumi IgarashiSaburo YamagataMasanori EbatoMasatoshi SakodaMDPI AGarticleAMDbackfillinggeochemical analysispyritedissolved oxygenMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1297, p 1297 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	AMD backfilling geochemical analysis pyrite dissolved oxygen Mineralogy QE351-399.2
spellingShingle	AMD backfilling geochemical analysis pyrite dissolved oxygen Mineralogy QE351-399.2 Kohei Yamaguchi Shingo Tomiyama Toshifumi Igarashi Saburo Yamagata Masanori Ebato Masatoshi Sakoda Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan
description	If the excavated underground veins are not backfilled, they may be a factor in the continued outflow of acid mine drainage (AMD). The flow rate of AMD can be reduced by backfilling underground drifts from abandoned mines. In addition, the quality of AMD may be improved as the flow rate of AMD reduces. In this paper, the quality of the AMD after backfilling was evaluated by a three-dimensional geochemical analysis model when the groundwater level was recovered after backfilling. The measured dissolved iron (Fe) and sulfate ion (SO<sub>4</sub><sup>2−</sup>) concentrations and pH before backfilling the drift were reproduced by the calibration of the simulation. Using the calibrated model, the pH at the outlet of the drift was changed from about pH 3 before backfilling to about pH 4 to 5 after backfilling. When calcite was contained in the filling materials of the drift, the pH approached neutral. However, when gypsum was formed, the neutralization was inhibited. The Fe concentration discharged from the drift was calculated at approximately 0.002 mol/L before backfilling. The total Fe concentration was calculated at 0.0004 mol/L or less after backfilling, and the dissolved Fe concentration decreased by several orders of magnitude after backfilling. A geochemical model quantitatively evaluated the improvement in water quality after backfilling the drifts. This method can be applied to the other abandoned mines with similar hydrogeological conditions.
format	article
author	Kohei Yamaguchi Shingo Tomiyama Toshifumi Igarashi Saburo Yamagata Masanori Ebato Masatoshi Sakoda
author_facet	Kohei Yamaguchi Shingo Tomiyama Toshifumi Igarashi Saburo Yamagata Masanori Ebato Masatoshi Sakoda
author_sort	Kohei Yamaguchi
title	Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan
title_short	Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan
title_full	Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan
title_fullStr	Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan
title_full_unstemmed	Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan
title_sort	improvement in ph and total iron concentration of acid mine drainage after backfilling: a case study of an underground abandoned mine in japan
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ed4fb8f8063a4e579ddc0e715ebdf2ee
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Improvement in pH and Total Iron Concentration of Acid Mine Drainage after Backfilling: A Case Study of an Underground Abandoned Mine in Japan

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