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Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD

Waste rocks (WRs) from a lignite-producing coalfield and fly ash (FA) produced from the same lignite have been investigated in this study with a primary objective to determine the potential for co-disposal of WRs and FA to reduce the environmental contamination. Mixing WRs with FA and covering WRs w...

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Autores principales: Qureshi, Asif, Maurice, Christian, Öhlander, Björn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8410730/
https://www.ncbi.nlm.nih.gov/pubmed/33928498
http://dx.doi.org/10.1007/s11356-021-13500-w
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author Qureshi, Asif
Maurice, Christian
Öhlander, Björn
author_facet Qureshi, Asif
Maurice, Christian
Öhlander, Björn
author_sort Qureshi, Asif
collection PubMed
description Waste rocks (WRs) from a lignite-producing coalfield and fly ash (FA) produced from the same lignite have been investigated in this study with a primary objective to determine the potential for co-disposal of WRs and FA to reduce the environmental contamination. Mixing WRs with FA and covering WRs with FA have been investigated. Particle size effect caused ≤2 mm particles to produce low pH (~2) and metal-laden leachates, indicating higher sulphide minerals’ reactivity compared to larger particles (≤10 mm, pH ~ 4). Co-disposal of FA as mixture showed an instantaneous effect, resulting in higher pH (~3–6) and better leachate quality. However, acidity produced by secondary mineralisation caused stabilisation of pH at around 4.5–5. In contrast, the pH of the leachates from the cover method gradually increased from strongly acidic (pH ~ 2) to mildly acidic (pH ~ 4–5) and circumneutral (pH ~ 7) along with a decrease in EC and elemental leaching. Gradually increasing pH can be attributed to the cover effect, which reduces the oxygen diffusion, thus sulphide oxidation. FA cover achieved the pH necessary for secondary mineralisation during the leaching experiment. The co-disposal of FA as cover and/or mixture possesses the potential for neutralisation and/or slowing down AMD and improving leachate quality.
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spelling pubmed-84107302021-09-22 Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD Qureshi, Asif Maurice, Christian Öhlander, Björn Environ Sci Pollut Res Int Research Article Waste rocks (WRs) from a lignite-producing coalfield and fly ash (FA) produced from the same lignite have been investigated in this study with a primary objective to determine the potential for co-disposal of WRs and FA to reduce the environmental contamination. Mixing WRs with FA and covering WRs with FA have been investigated. Particle size effect caused ≤2 mm particles to produce low pH (~2) and metal-laden leachates, indicating higher sulphide minerals’ reactivity compared to larger particles (≤10 mm, pH ~ 4). Co-disposal of FA as mixture showed an instantaneous effect, resulting in higher pH (~3–6) and better leachate quality. However, acidity produced by secondary mineralisation caused stabilisation of pH at around 4.5–5. In contrast, the pH of the leachates from the cover method gradually increased from strongly acidic (pH ~ 2) to mildly acidic (pH ~ 4–5) and circumneutral (pH ~ 7) along with a decrease in EC and elemental leaching. Gradually increasing pH can be attributed to the cover effect, which reduces the oxygen diffusion, thus sulphide oxidation. FA cover achieved the pH necessary for secondary mineralisation during the leaching experiment. The co-disposal of FA as cover and/or mixture possesses the potential for neutralisation and/or slowing down AMD and improving leachate quality. Springer Berlin Heidelberg 2021-04-29 2021 /pmc/articles/PMC8410730/ /pubmed/33928498 http://dx.doi.org/10.1007/s11356-021-13500-w Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Research Article
Qureshi, Asif
Maurice, Christian
Öhlander, Björn
Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD
title Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD
title_full Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD
title_fullStr Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD
title_full_unstemmed Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD
title_short Co-disposal of lignite fly ash and coal mine waste rock for neutralisation of AMD
title_sort co-disposal of lignite fly ash and coal mine waste rock for neutralisation of amd
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8410730/
https://www.ncbi.nlm.nih.gov/pubmed/33928498
http://dx.doi.org/10.1007/s11356-021-13500-w
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