Effects of bentonite and polymer soil amendment on contaminant transport parameters

Pandey, MR and Badiger, S and Babu, GLS (2019) Effects of bentonite and polymer soil amendment on contaminant transport parameters. In: Journal of Hazardous, Toxic, and Radioactive Waste, 23 (1).

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Abstract

The contaminant transport parameters such as hydraulic conductivity and diffusion coefficient are determined and compared for barrier composed of (1) soil, (2) soil-bentonite (SB), and (3) soil-polymer (SP) mixes. Chloride (Cl-) is taken as the contaminant of interest because it is nonreactive. Sodium bentonite (NaB) and super-absorbent polymer (SAP) which is an anionic polyelectrolyte, is used for the study. Addition of NaB reduced the hydraulic conductivity of the soil and the diffusive transport through the soil barrier. Soil mixed with SAP was found to be more efficient in containing contaminants. The values of hydraulic conductivity and diffusion coefficient for SP mixes were lower than those observed for SB mixes. Low values of hydraulic conductivity and diffusion coefficient are attributed to the decrease of free channels for the contaminant transport and increase in the immobile water in the mix along with the increase in effective length. Microanalyses show that the addition of polymer causes the dispersion of soil particles which is similar to the observations from previous studies.

Item Type:	Journal Article
Publication:	Journal of Hazardous, Toxic, and Radioactive Waste
Publisher:	American Society of Civil Engineers (ASCE)
Additional Information:	The copyright for this article belongs to the American Society of Civil Engineers (ASCE).
Keywords:	Absorption; Additives; Bentonite; Chlorine compounds; Contamination; Diffusion; Hydraulic conductivity; Polyelectrolytes; Sodium compounds, Addition of polymer; Anionic poly-electrolytes; Contaminant transport; Diffusive transport; Immobile water; Sodium bentonite; Soil bentonite; Superabsorbent polymer, Impurities, bentonite; diffusion; hydraulic conductivity; parameterization; pollutant transport; polymer; soil amendment
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	15 Nov 2022 09:37
Last Modified:	15 Nov 2022 09:37
URI:	https://eprints.iisc.ac.in/id/eprint/78045

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