An Experimental Study of Sand–Clay Mixtures Contaminated with Lead and Zinc Heavy Metals

Abstract This study aims to investigate the geotechnical and chemical properties of sand–clay mixtures contaminated with lead and zinc. To prepare the specimens, two kinds of mixtures were studied. Sand–kaolinite and sand–bentonite with different clay fractions were investigated through consistency...

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Published in:Journal of hazardous, toxic and radioactive waste toxic and radioactive waste, 2021-10, Vol.25 (4)
Main Authors: Nikkhah Nasab, Saeid, Keykha, Hamed A
Format: Article
Language:English
Subjects:
Acidity
Adsorption
Bentonite
Chemical properties
Clay
Compression
Compression tests
Contaminants
Electrical resistivity
Friction
Hazardous materials
Heavy metals
Kaolinite
Lead
Metals
pH effects
Sand
Sediment pollution
Shear tests
Soil contamination
Soil pollution
Soils
Technical Papers
Zinc
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creator Nikkhah Nasab, Saeid
Keykha, Hamed A
description Abstract This study aims to investigate the geotechnical and chemical properties of sand–clay mixtures contaminated with lead and zinc. To prepare the specimens, two kinds of mixtures were studied. Sand–kaolinite and sand–bentonite with different clay fractions were investigated through consistency limits, pH measurement, direct shear test, unconfined compression test, batch adsorption experiment, and electrical resistivity. The heavy metal contaminants were lead nitrate and zinc nitrate hexahydrate, and contaminated specimens were prepared in the laboratory with desired concentrations (i.e., 1.5% and 3% by weight of the dry soil). Based on the obtained results, the presence of kaolinite in specimens decreased the angle of friction. On the other hand, the presence of bentonite in mixtures increased the friction angle. Moreover, sand mixtures including bentonite showed a better capability to adsorb heavy metals than sand–kaolinite mixtures. The electrical resistivity of all the sand–clay mixtures decreased with the increase of concentration. Owing to the acidity feature of heavy metals, the pH of the contaminated soil solutions decreased. Moreover, the adsorption of heavy metals in soils including bentonite was more than that of sand with kaolinite.
doi_str_mv 10.1061/(ASCE)HZ.2153-5515.0000631
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To prepare the specimens, two kinds of mixtures were studied. Sand–kaolinite and sand–bentonite with different clay fractions were investigated through consistency limits, pH measurement, direct shear test, unconfined compression test, batch adsorption experiment, and electrical resistivity. The heavy metal contaminants were lead nitrate and zinc nitrate hexahydrate, and contaminated specimens were prepared in the laboratory with desired concentrations (i.e., 1.5% and 3% by weight of the dry soil). Based on the obtained results, the presence of kaolinite in specimens decreased the angle of friction. On the other hand, the presence of bentonite in mixtures increased the friction angle. Moreover, sand mixtures including bentonite showed a better capability to adsorb heavy metals than sand–kaolinite mixtures. The electrical resistivity of all the sand–clay mixtures decreased with the increase of concentration. Owing to the acidity feature of heavy metals, the pH of the contaminated soil solutions decreased. 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To prepare the specimens, two kinds of mixtures were studied. Sand–kaolinite and sand–bentonite with different clay fractions were investigated through consistency limits, pH measurement, direct shear test, unconfined compression test, batch adsorption experiment, and electrical resistivity. The heavy metal contaminants were lead nitrate and zinc nitrate hexahydrate, and contaminated specimens were prepared in the laboratory with desired concentrations (i.e., 1.5% and 3% by weight of the dry soil). Based on the obtained results, the presence of kaolinite in specimens decreased the angle of friction. On the other hand, the presence of bentonite in mixtures increased the friction angle. Moreover, sand mixtures including bentonite showed a better capability to adsorb heavy metals than sand–kaolinite mixtures. The electrical resistivity of all the sand–clay mixtures decreased with the increase of concentration. Owing to the acidity feature of heavy metals, the pH of the contaminated soil solutions decreased. 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source American Society Of Civil Engineers ASCE Journals
subjects Acidity
Adsorption
Bentonite
Chemical properties
Clay
Compression
Compression tests
Contaminants
Electrical resistivity
Friction
Hazardous materials
Heavy metals
Kaolinite
Lead
Metals
pH effects
Sand
Sediment pollution
Shear tests
Soil contamination
Soil pollution
Soils
Technical Papers
Zinc
title An Experimental Study of Sand–Clay Mixtures Contaminated with Lead and Zinc Heavy Metals
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