Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings

Abstract In this work, we assess the self-sealing and swelling ability of the compacted granular bentonite (GB) under an inorganic salt environment and induced overburden stresses from the landfill waste. The laboratory permeation tests with high ionic strength salt solutions reveal that the GB fail...

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Autores principales:	Partha Das, Tadikonda Venkata Bharat
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5a6a23b2dab04f839db8ca8d5dbaaeb4
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spelling	oai:doaj.org-article:5a6a23b2dab04f839db8ca8d5dbaaeb42021-12-02T15:55:18ZKaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings10.1038/s41598-021-89787-z2045-2322https://doaj.org/article/5a6a23b2dab04f839db8ca8d5dbaaeb42021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89787-zhttps://doaj.org/toc/2045-2322Abstract In this work, we assess the self-sealing and swelling ability of the compacted granular bentonite (GB) under an inorganic salt environment and induced overburden stresses from the landfill waste. The laboratory permeation tests with high ionic strength salt solutions reveal that the GB fails to seal and exhibits a significant mechanical collapse under different applied stresses. The applicability of GB in the form of geosynthetic clay liners as the bottom liner facilities in landfills that produce high ionic strength salt leachates, therefore, remains a serious concern. We propose an additional barrier system based on kaolin, for the first time, to address this problem. The proposed kaolin-GB layered system performs satisfactorily in terms of its sealing and swelling ability even in adverse saline conditions and low overburden stresses. The kaolin improves the osmotic efficiency of the self and also helps the underlying GB layer to seal the inter-granular voids. The estimated design parameters by through-diffusion test suggest that the kaolin-GB layered system effectively attenuates the permeant flux and suitable as a landfill liner.Partha DasTadikonda Venkata BharatNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Partha Das Tadikonda Venkata Bharat Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
description	Abstract In this work, we assess the self-sealing and swelling ability of the compacted granular bentonite (GB) under an inorganic salt environment and induced overburden stresses from the landfill waste. The laboratory permeation tests with high ionic strength salt solutions reveal that the GB fails to seal and exhibits a significant mechanical collapse under different applied stresses. The applicability of GB in the form of geosynthetic clay liners as the bottom liner facilities in landfills that produce high ionic strength salt leachates, therefore, remains a serious concern. We propose an additional barrier system based on kaolin, for the first time, to address this problem. The proposed kaolin-GB layered system performs satisfactorily in terms of its sealing and swelling ability even in adverse saline conditions and low overburden stresses. The kaolin improves the osmotic efficiency of the self and also helps the underlying GB layer to seal the inter-granular voids. The estimated design parameters by through-diffusion test suggest that the kaolin-GB layered system effectively attenuates the permeant flux and suitable as a landfill liner.
format	article
author	Partha Das Tadikonda Venkata Bharat
author_facet	Partha Das Tadikonda Venkata Bharat
author_sort	Partha Das
title	Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
title_short	Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
title_full	Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
title_fullStr	Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
title_full_unstemmed	Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
title_sort	kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/5a6a23b2dab04f839db8ca8d5dbaaeb4
work_keys_str_mv	AT parthadas kaolinbasedprotectivebarrierinmunicipallandfillsagainstadversechemomechanicalloadings AT tadikondavenkatabharat kaolinbasedprotectivebarrierinmunicipallandfillsagainstadversechemomechanicalloadings
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Kaolin based protective barrier in municipal landfills against adverse chemo-mechanical loadings

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