Mudstones as Landfill Liner Material for Heavy Metal Removal: Equilibrium and Dynamic Sorption Study

Clay materials used as low-permeability barriers at landfill sites can also chemically attenuate inorganic contaminants (heavy metals) in leachate. In this study, Cu(II) removal capacity from aqueous media of a raw calcareous mudstone, used as a liner material, was evaluated through both batch and c...

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Bibliographic Details
Published in:	Water, air, and soil pollution Vol. 233; no. 4
Main Authors:	Musso, Telma Belen, Carlos, Luciano, Parolo, Maria Eugenia, Francisca, Franco Matías, Pettinari, Gisela, Giuliano, Valeria, Ruffato, Marianerla
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-04-2022 Springer Springer Nature B.V
Subjects:	Adsorption Anions Aqueous solutions Atmospheric Protection/Air Quality Control/Air Pollution Bentonite Calcite Capacity Carbonates Clay Clay liners Climate Change/Climate Change Impacts Composition effects Contaminants Copper Dynamical systems Earth and Environmental Science Environment Environmental monitoring Heavy metals Humic acid Humic acids Hydrogeology Inorganic contaminants Landfill Landfills Leachates Machining Metals Mudstone Organic compounds Permeability pH effects Phenols Porous media Refuse and refuse disposal Removal Soil Science & Conservation Sorbents Sorption Surface active agents Tests Uptake Waste disposal sites Water Quality/Water Pollution Precipitation Clay liners Adsorption Calcite Leachate Heavy metal
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Summary:	Clay materials used as low-permeability barriers at landfill sites can also chemically attenuate inorganic contaminants (heavy metals) in leachate. In this study, Cu(II) removal capacity from aqueous media of a raw calcareous mudstone, used as a liner material, was evaluated through both batch and column tests. Batch experiments were conducted varying contact time, pH, and Cu(II) concentration. In order to simulate waste leachates composition, the effect of the presence of some organic compounds on Cu(II) uptake was also evaluated. Column tests of compacted calcareous mudstone-sand mixtures were performed to evaluate sorption in dynamic systems. The studied calcareous mudstone exhibited higher removal capacity in a wider pH range than a commercial Na-bentonite, which is a widely used heavy metal sorbent and clay liner. It was evidenced that calcite, an important component of the calcareous mudstone and found as very small and highly porous calcareous nannofossils, contributed to its sorption properties playing a significant role in the Cu(II) removal. The presence of an anionic surfactant or phenol slightly affected the removal of Cu(II). In the clay fraction (< 2 µm), Cu(II) sorption was favored by the presence of humic acids, which add new adsorption sites for this metal. The extremely high retardation factor obtained for the raw calcareous mudstone is in good agreement with the high adsorption capacity experimentally proved in batch tests and demonstrated a great ability of this material to retain heavy metal mass during the transport in solution within porous media.
ISSN:	0049-6979 1573-2932
DOI:	10.1007/s11270-022-05610-z