Sources and remediation techniques for mercury contaminated soil

Xu, Jia‐Zhuang; Bravo, Andrea G.; Lagerkvist, Anders; Bertilsson, Stefan; Sjöblom, Rolf; Kumpienė, Jūratė

doi:10.1016/j.envint.2014.09.007

Cited by 242 publications

(111 citation statements)

References 118 publications

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“…This is in accordance with Peters et al [56]. Otherwise, no relevant reduction in organo-Hg-complexes was found due to the interference of organic matter with MGDA chelant action [50].…”

Section: Hg Removal Kinetics In Enhanced Treatmentssupporting

confidence: 80%

“…A corresponding strong reduction of all Hg fractions investigated was also observed (Table 5). A probable reason is the improvement of the Hg chelant action of MGDA due to the specific action of the surfactant on the removal of organic matter and F4 fraction (Table 5), which are known to reduce the chelant action [50,58]. Chelating agents were shown to be very good synergists in combined use with surfactants.…”

Section: Hg Removal Kinetics In Enhanced Treatmentsmentioning

confidence: 99%

“…The relatively low removals achievable at the end of the unenhanced MW treatment mainly depended on the high percentage of carbonates, organic matter and sulphides ( (Table 5). Hg(II) forms extremely strong complexes with organic matter adsorbed onto the sediment surface [50] and reduced sulphur [14], affecting Hg transport and removal mechanisms.…”

Section: Hg Removal Kinetics In Unenhanced Treatmentsmentioning

confidence: 99%

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Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH)

Falciglia

Malarbì

Maddalena

et al. 2017

Chemical Engineering Journal

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This version is available at https://strathprints.strath.ac.uk/60331/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. AbstractThe aim of this work was to investigate Hg removal ability of a novel microwave heating (MWH) treatment for marine sediment remediation enhanced by the application of several agents, biodegradable complexing agent (methylglycinediacetic acid, MGDA), surfactant (Tween ® 80), and citric acid. Main results revealed that MWH allowed a very rapid heating (~450 °C in 7 min) of the irradiated medium. However, without the addition of enhancing agents, a maximum Hg removal of ~72% can be achieved. The application of MGDA led to a higher contaminant removal of ~87% (residual concentration = 5.4 mg kg -1 ). For the treatment including the simultaneous addition of both chelating agent and surfactant, their synergetic action and stripping processes resulted in a very high Hg removal of ~99% for an irradiation time of 7 min, corresponding to a residual concentration of 0.56 mg kg -1 , which is lower than the Italian regulatory limit of 1 mg kg -1 . The use of citric acid resulted in a shortening of the removal kinetics, which allowed the successful application of a shorter remediation time of 5 min. The observed strong passive ability of sediments to convert a microwave irradiation energy into a rapid and large temperature increase undoubtedly represents a key factor in the whole remediation process, making the studied treatment an excellent choice. Kinetic data are suitable for a preliminarily assessment of the effectiveness of clean-up activities, and as basis for future scaling-up studies on MWH of Hgcontaminated sediments.

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“…This is in accordance with Peters et al [56]. Otherwise, no relevant reduction in organo-Hg-complexes was found due to the interference of organic matter with MGDA chelant action [50].…”

Section: Hg Removal Kinetics In Enhanced Treatmentssupporting

confidence: 80%

Section: Hg Removal Kinetics In Enhanced Treatmentsmentioning

confidence: 99%

Section: Hg Removal Kinetics In Unenhanced Treatmentsmentioning

confidence: 99%

See 1 more Smart Citation

Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH)

Falciglia

Malarbì

Maddalena

et al. 2017

Chemical Engineering Journal

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“…Studies on Hg mobility have been carried out in order to proceed with soil-remediation techniques in mining areas, e.g. [61] and references therein. [62] assessed that adsorpion/desorption processes control the behavior of Hg in the soil, suggesting that mercury can be occurring in dissolved, non-specifically and/or specifically adsorbed, chelated or precipitated forms.…”

Section: Total and Leached Mercury Concentrations In The Building Andmentioning

confidence: 99%

Gaseous Elemental Mercury and Total and Leached Mercury in Building Materials from the Former Hg-Mining Area of Abbadia San Salvatore (Central Italy)

Vaselli¹,

Nisi²,

Rappuoli³

et al. 2017

Preprint

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Mercury has a strong environmental impact since both its organic and inorganic forms are toxic and it represents a pollutant of global concern. Liquid Hg is highly volatile and it can be released during natural and anthropogenic processes in the hydrosphere, biosphere and atmosphere. In this study the distribution of Gaseous Elemental Mercury (GEM) and the total and leached mercury concentrations on paints, plasters, roof tiles, concretes, metals, dust and wood structures were determined in the main buildings and structures of the former Hg-mining area of Abbadia San Salvatore (Siena, Central Italy). The mining complex (divided into 7 units) covers a surface of about 65 ha and contains mining structures and managers and workers buildings. In this work, nine surveys of GEM measurements were carried out from July 2011 to August 2015 for the buildings and structures located in the units 2, 3 and 6. Moreover, detailed measurements were performed in February, April, July, September and December 2016 in the edifices and mining structures of Unit 6. GEM concentrations showed a strong variability in terms of space and time mostly depending on the distance from the building hosting driers, furnaces and condensers and ambient temperature, respectively. In the Unit 2 surveys carried out in the hotter period (from June to September) showed GEM concentrations up to 27,500 ng m −3 , while in the Unit 6 they were on average much higher and occasionally they saturated the GEM measurement device (>50,000 ng m −3 ). Concentrations of total (in mg kg −1 ) and leached (in μg L −1 ) mercury measured in different building materials (up to 46,580 mg kg −1 and 4,470 mg L −1 for total and leached mercury, respectively) showed for the same type of material highly variable values in dependence on the edifice or mining structure from which they were collected. The results obtained in this study are of relevant interest for the operational cleanings to be carried out during the reclamation activities.

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“…Actualmente han aumentado las concentraciones de Hg en suelos debido principalmente a la quema de combustibles fósiles combinados con procesos de transporte atmosférico de largo alcance. Otras fuentes como las plantas de cloro-álcali, la minería del oro y la producción de cemento también pueden ser significativas, al menos a nivel local (Xu et al 2015). Se observa que el sitio donde se encontraron los valores más altos de Hg-t (>10 μg/g) en suelo en el municipio de SML coincide con el sitio donde Olivero-Verbel et al (2014) reportaron concentraciones de Hg-t en aire superiores a 200 ng/m 3 .…”

Section: Discussionunclassified

Impacto De La Minería Del Oro Asociado Con La Contaminación Por Mercurio en Suelo Superficial De San Martín De Loba, Sur De Bolívar (Colombia)

Rocha-Román

Olívero-Verbel

Caballero-Gallardo

2018

Rev. Int. Contam. Ambie.

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Palabras clave: toxicidad, ambiente, actividades antrópicas, salud humana RESUMEN Las actividades humanas han aumentado la contaminación por mercurio (Hg) en los ambientes terrestres, especialmente en áreas de minería de oro. El objetivo de este estudio fue evaluar las concentraciones de mercurio total (Hg-t) en muestras de suelo superficial de San Martin de Loba, sur de Bolívar (Colombia), así como determinar el nivel de contaminación en el suelo. Un total de 202 muestras de suelo superficial fueron colectadas en San Martín de Loba. Los niveles de Hg-t fueron medidos por atomización electrotérmica y espectroscopia de absorción atómica. Las concentraciones de Hg-t variaron de 0.002 a 23.83 μg/g, con un valor medio de 3.40 ± 0.36 μg/g, el cual es ligeramente más alto que para el Hg en suelo a nivel mundial. El índice de geo-acumulación (Igeo) para suelo alcanzó valores superiores a 5, indicando una contaminación extrema (Clase 6) en el 17 % de las muestras, mientras que el 70 % fueron Clase 5 (fuertemente a extremadamente contaminado). Este estudio también ofrece un mapa de riesgos para evaluar las posibles repercusiones negativas. En conclusión, el municipio de San Martín de Loba puede considerarse una zona fuertemente contaminada con alto contenido de Hg. La tecnología utilizada para extraer oro a lo largo de los procesos de amalgamación provoca un alto grado de contaminación por Hg en torno a esta área de minería de oro. Por lo tanto, deben considerarse métodos alternativos de extracción para reducir los niveles de Hg que pueden liberarse al ambiente y afectar la salud humana.Key words: toxicity, environment, anthropogenic activities, human health ABSTRACT Human activities have increased mercury (Hg) contamination of terrestrial environments, especially gold mining areas. The aim of this study was to evaluate total Hg concentrations (T-Hg) in surface soil samples of San Martín de Loba, south of Bolívar (Colombia), to determine their Hg contamination level. For that purpose, 202 surface soil samples were collected. T-Hg levels were measured by electrothermal atomization and atomic absorption spectroscopy. The T-Hg surface soil concentrations ranged between 0.002 and 23.83 μg/g, with a median value of 3.40 ± 0.36 μg/g, which is

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Sources and remediation techniques for mercury contaminated soil

Cited by 242 publications

References 118 publications

Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH)

Remediation of Hg-contaminated marine sediments by simultaneous application of enhancing agents and microwave heating (MWH)

Gaseous Elemental Mercury and Total and Leached Mercury in Building Materials from the Former Hg-Mining Area of Abbadia San Salvatore (Central Italy)

Impacto De La Minería Del Oro Asociado Con La Contaminación Por Mercurio en Suelo Superficial De San Martín De Loba, Sur De Bolívar (Colombia)

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