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Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions

Generated hazardous or toxic waste posses a serious threat if dumped into ponds or low lying areas which leads to contamination, this necessitates the effective landfill liner system. Mainly compacted clayey soils are used as an engineered barrier. Recently, composite materials have gained popularit...

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Autores principales: Garg, Ankit, Reddy, Narala Gangadhara, Huang, He, Buragohain, Poly, Kushvaha, Vinod
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7347910/
https://www.ncbi.nlm.nih.gov/pubmed/32647117
http://dx.doi.org/10.1038/s41598-020-68198-6
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author Garg, Ankit
Reddy, Narala Gangadhara
Huang, He
Buragohain, Poly
Kushvaha, Vinod
author_facet Garg, Ankit
Reddy, Narala Gangadhara
Huang, He
Buragohain, Poly
Kushvaha, Vinod
author_sort Garg, Ankit
collection PubMed
description Generated hazardous or toxic waste posses a serious threat if dumped into ponds or low lying areas which leads to contamination, this necessitates the effective landfill liner system. Mainly compacted clayey soils are used as an engineered barrier. Recently, composite materials have gained popularity as landfill liner materials, including the use of waste materials amended with low permeable soils. Though, studies on the composite optimum mix and its corresponding thickness are very scarce. Here, we evaluated the unconfined compressive strength and hydraulic conductivity of fly ash–bentonite composites. Efforts were also made to determine the thickness of landfill liner composite using a finite difference method (i.e. MATLAB). The results reveal that composite consists of 30% bentonite and 70% fly ash is suitable for landfill liner, which meets strength and permeability criteria. Numerical simulation for five major contaminants shows that the composite plays a crucial role in reducing the leaching of heavy metals and suggests an optimum thickness in the range of 126–154 cm. Overall, the findings of the study indicate that fly ash–bentonite composite can be used to solve real-life challenges in a sustainable way.
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spelling pubmed-73479102020-07-14 Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions Garg, Ankit Reddy, Narala Gangadhara Huang, He Buragohain, Poly Kushvaha, Vinod Sci Rep Article Generated hazardous or toxic waste posses a serious threat if dumped into ponds or low lying areas which leads to contamination, this necessitates the effective landfill liner system. Mainly compacted clayey soils are used as an engineered barrier. Recently, composite materials have gained popularity as landfill liner materials, including the use of waste materials amended with low permeable soils. Though, studies on the composite optimum mix and its corresponding thickness are very scarce. Here, we evaluated the unconfined compressive strength and hydraulic conductivity of fly ash–bentonite composites. Efforts were also made to determine the thickness of landfill liner composite using a finite difference method (i.e. MATLAB). The results reveal that composite consists of 30% bentonite and 70% fly ash is suitable for landfill liner, which meets strength and permeability criteria. Numerical simulation for five major contaminants shows that the composite plays a crucial role in reducing the leaching of heavy metals and suggests an optimum thickness in the range of 126–154 cm. Overall, the findings of the study indicate that fly ash–bentonite composite can be used to solve real-life challenges in a sustainable way. Nature Publishing Group UK 2020-07-09 /pmc/articles/PMC7347910/ /pubmed/32647117 http://dx.doi.org/10.1038/s41598-020-68198-6 Text en © The Author(s) 2020 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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Garg, Ankit
Reddy, Narala Gangadhara
Huang, He
Buragohain, Poly
Kushvaha, Vinod
Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
title Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
title_full Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
title_fullStr Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
title_full_unstemmed Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
title_short Modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
title_sort modelling contaminant transport in fly ash–bentonite composite landfill liner: mechanism of different types of ions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7347910/
https://www.ncbi.nlm.nih.gov/pubmed/32647117
http://dx.doi.org/10.1038/s41598-020-68198-6
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