Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

Erschienen in: Bulletin of Engineering Geology and the Environment 2/2021

02.10.2020 | Original Paper

A chemo-geotechnical approach to obtain optimal mixtures of zeolite-bentonite as heavy metal adsorbents

verfasst von: Elahe Karimdad, Mohammad Bashirgonbadi, Ebrahim Rahimi

Erschienen in: Bulletin of Engineering Geology and the Environment | Ausgabe 2/2021

Einloggen, um Zugang zu erhalten
share
TEILEN

Abstract

The removal or reduction of heavy metal leakage from waste leachates into the soil and aquatic environment has been of interest for many years. A suitable solution is to enclose wastes in the impermeable, adsorbent, and durable layers that tolerate different ambient conditions. This indicates the need to consider geotechnical parameters along with the adsorption behavior of the adsorbents. In routine practice, a mixture of bentonite clay, zeolite, and geo-synthetics is used. This study aims to introduce suitable mixtures of zeolite and bentonite as natural adsorbents for sealing/adsorption of heavy metals in liner systems. Various mixtures of bentonite and zeolites of clinoptilolite and clinoptilolite-heulandite types were examined. Twenty-three mixed and non-mixed samples were prepared and tested. Once the soil index and soil compaction parameters were determined, an experiment program was designed to evaluate the cracking potential related to the freeze-drying process, as well as the adsorption potential of the samples at different ambient conditions (i.e., temperature and pH). It is observed that increasing the temperature up to 40 °C increases the adsorption potential. According to the results, the optimal adsorbents were found in the mixtures of zeolite/bentonite with the ratio of 4:1 in the first place and zeolite/bentonite with a ratio of 3:1 in the second, under various conditions.
Literatur
Zurück zum Zitat Chamberlain EJ, Iskander I, Hunsiker SE Effect of freeze–thaw on the permeability and macrostructure of soils. In: Proceedings of the International Symposium on Frozen Soil Impacts on Agriculture, Range, and Forest Lands. Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire, U.S.A, 1990. vol 1. pp 145–155 Chamberlain EJ, Iskander I, Hunsiker SE Effect of freeze–thaw on the permeability and macrostructure of soils. In: Proceedings of the International Symposium on Frozen Soil Impacts on Agriculture, Range, and Forest Lands. Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire, U.S.A, 1990. vol 1. pp 145–155
Zurück zum Zitat Mumpton FA (1975) Commercial uses of natural zeolites. In: Industrial minerals and rocks Mumpton FA (1975) Commercial uses of natural zeolites. In: Industrial minerals and rocks
Metadaten
Titel
A chemo-geotechnical approach to obtain optimal mixtures of zeolite-bentonite as heavy metal adsorbents
verfasst von
Elahe Karimdad
Mohammad Bashirgonbadi
Ebrahim Rahimi
Publikationsdatum
02.10.2020
Verlag
Springer Berlin Heidelberg
Erschienen in
Bulletin of Engineering Geology and the Environment / Ausgabe 2/2021
Print ISSN: 1435-9529
Elektronische ISSN: 1435-9537
DOI
https://doi.org/10.1007/s10064-020-01984-8

Weitere Artikel der Ausgabe 2/2021

Bulletin of Engineering Geology and the Environment 2/2021 Zur Ausgabe