Stabilization of lead contaminated soil with traditional and alternative binders

Contessi, Silvia; Calgaro, Loris; Dalconi, Maria Chiara; Bonetto, Alessandro; Bellotto, M.; Ferrari, Giorgio; Marcomini, Antonio; Artioli, Gilberto

doi:10.1016/j.jhazmat.2019.120990

Cited by 71 publications

(24 citation statements)

References 60 publications

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“…Previous works (Calgaro et al, 2021; Contessi, Calgaro, et al, 2020; Contessi, Dalconi, et al, 2020) highlighted the presence of serious heavy metals' contamination in the industrial site of Bagnolo Mella located in Italy. In some detail, a soil sample was collected from the surface of a selected area to 1.5‐m depth, showing both heavy metals' content (i.e., Pb, As, Se, Hg, and Sb), exceeding the Italian regulations for industrial use of soils and sediments (EMD, 2006), and the presence of mineralogical phases derived from anthropogenic activities (i.e., gypsum, anglesite, lithargite, jarosite, hematite, and amorphous iron oxides).…”

Section: Resultsmentioning

confidence: 94%

“…There is an agrarian consortium producing fertilizers near the SW border of the City, close to various smelting and steel manufacturing plants. The site includes installations dedicated to different industrial activities, from sulfuric acid production through pyrite roasting (lead chambers process) to fuel and mineral oil storage (Calgaro et al, 2021; Contessi, Calgaro, et al, 2020; Contessi, Dalconi, et al, 2020).…”

Section: Methodsmentioning

confidence: 99%

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A multitechnique approach for the identification of multiple contamination sources near a polluted industrial site

et al. 2022

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Degraded land requires rapid and suitable remedial actions, thus appropriate and fast methodological approaches for estimating the spatial distribution of contaminants are needed. In this context, a methodological approach combining isotopic measurements, heavy metals concentrations mapping, X‐ray diffraction, and cluster analysis, was applied to characterize a polluted industrial site where the contamination due to improper waste disposal could have spread also into the surrounding fields. This approach was applied to a set of representative topsoil (from 15 to 30 cm depth) and subsoil (from 130 to 150 cm depth) samples, selected either inside or outside the contaminated site. The X‐ray diffraction analysis highlighted that only the mineralogy of the subsoil below the buried waste was noticeably altered, while the concentration mapping highlighted that the levels of several heavy metals on the edge of the contaminated site, at both depths, were very similar to those found in the samples from the outside. Based on these findings, Pb was used as a tracer for heavy metal pollution by its stable isotopes' analysis. The cluster analysis of the isotopic measurements revealed that only the contamination detected inside the industrial site could be attributed to the pollutants migration from the buried waste. Conversely, the contaminants concentrations found in the topsoil samples taken outside the site could be ascribed to contamination sources other than the polluted waste present inside the site.

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Section: Resultsmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

A multitechnique approach for the identification of multiple contamination sources near a polluted industrial site

et al. 2022

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“…Formation of CSH gel-like, which is characterized by high specific surface area, is responsible of the adsorption of several contaminants. Contessi et al (2020) [70] highlighted the formation layers of CHS containing high concentrations of Pb during the stabilization of a Pb-contaminated materials stabilization. Fixation of contaminants by CSH phase is pH dependent.…”

Section: I)mentioning

confidence: 99%

Stabilization/solidification of sediments: challenges and novelties

Elghali¹,

Benzaazoua

Couvidat

et al. 2022

Low Carbon Stabilization and Solidification of Hazardous Wastes

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“…Toxic heavy metals in contaminants can be slowly released by weathering and thereby co-precipitate metals as hydroxides and the occurrence of oxides of metals, such as Fe, Ti and Mn. Fe-bearing mineral phases are transformed into secondary metals species by the redox potential of the soil environment, Fe oxide is present in various forms such as hydrous oxides (e.g., ferrihydrite, hydrohematite, and maghemite), and oxyhydroxides (e.g., goethite, lepidocrocite, and feroxyhyte) [ 11 , 12 , 13 ]. In addition, the Fe oxide phase plays a key role in the amorphous toxic heavy metals sorption process because of their reactivity, surface area, and surface charge.…”

Section: Introductionmentioning

confidence: 99%

Remediation of Toxic Heavy Metal Contaminated Soil by Combining a Washing Ejector Based on Hydrodynamic Cavitation and Soil Washing Process

Kim

Cho

Purev

et al. 2022

IJERPH

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Based on the features of hydrodynamic cavitation, in this study, we developed a washing ejector that utilizes a high-pressure water jet. The cavitating flow was utilized to remove fine particles from contaminated soil. The volume of the contaminants and total metal concentration could be correlated to the fine-particle distribution in the contaminated soil. These particles can combine with a variety of pollutants. In this study, physical separation and soil washing as a two-step soil remediation strategy were performed to remediate contaminated soils from the smelter. A washing ejector was employed for physical separation, whereas phosphoric acid was used as the washing agent. The particles containing toxic heavy metals were composed of metal phase encapsulated in phyllosilicates, and metal phase weakly bound to phyllosilicate surfaces. The washing ejector involves the removal of fine particles bound to coarse particles and the dispersion of soil aggregates. From these results we determined that physical separation using a washing ejector was effective for the treatment of contaminated soil. Phosphoric acid (H3PO4) was effective in extracting arsenic from contaminated soil in which arsenic was associated with amorphous iron oxides. Thus, the obtained results can provide useful information and technical support for field soil washing for the remediation of soil contaminated by toxic heavy metals through emissions from the mining and ore processing industries.

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Stabilization of lead contaminated soil with traditional and alternative binders

Cited by 71 publications

References 60 publications

A multitechnique approach for the identification of multiple contamination sources near a polluted industrial site

A multitechnique approach for the identification of multiple contamination sources near a polluted industrial site

Stabilization/solidification of sediments: challenges and novelties

Remediation of Toxic Heavy Metal Contaminated Soil by Combining a Washing Ejector Based on Hydrodynamic Cavitation and Soil Washing Process

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