The use of soil-flushing to remediate metal contamination in a smelting slag dumping area: Column and pilot-scale experiments

Navarro, Andrés; Martínez, Francisco

doi:10.1016/j.enggeo.2010.07.001

Cited by 36 publications

(17 citation statements)

References 29 publications

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“…1. The efficiency with which water removed heavy metals was related to soil type and heavy metal form (Navarro and Martínez 2010). In our experiment, the removal rates of Pb and Zn by water were only 0.71 % and 1.25 %, respectively.…”

Section: Resultsmentioning

confidence: 88%

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Wang

Jiang

et al. 2015

Environ Sci Pollut Res

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Pb and Zn contamination in agricultural soils has become an important issue for human health and the environment. Washing is an effective method for remediating polluted soil. Here, we compare several washing materials and methods in the treatment of Pb- and Zn-polluted farmland soil. We examined four washing reagents, hydrochloric acid, citric acid, Na2EDTA, and tartaric acid, all of which independently removed Zn at rates >65 %. Combining washing reagents markedly enhanced heavy metal removal, by using Na2EDTA and either tartaric acid or lactate in sequence: Pb and Zn removal rates improved to 84.1 and 82.1 % for Na2EDTA-tartaric acid; and to 88.3 and 89.9 % for Na2EDTA-lactate, respectively. Additionally, combining ultrasound with conventional washing methods markedly improved washing efficiency, by shortening washing duration by 96 %. We achieved similar removal rates using ultrasound for 10 min, compared with traditional mechanical vibration alone for 4 h. We concluded that treating Pb- and Zn-contaminated soil with appropriate washing reagents under optimal conditions can greatly enhance the remediation of polluted farmland soils.

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Section: Resultsmentioning

confidence: 88%

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Wang

Jiang

et al. 2015

Environ Sci Pollut Res

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“…The second case, surfactant-aided soil flushing (SASF), is based on dragging of pollutants through the soil by the movement of a flushing fluid. Two different technologies can be distinguished within this area: conventional soil flushing (SASCF) [5][6][7][8][9][10] and electrokinetic soil flushing (SASEF) [11][12][13][14][15]. The main difference between these approaches is the driving force, which in the first case is the pressure gradient between the injection site of the flushing fluid and the fluid extraction site, and in the second case is a voltage gradient between rows of electrodes located in electrolyte wells in the soil.…”

Section: Introductionmentioning

confidence: 99%

Electrocoagulation of the effluents from surfactant-aided soil-remediation processes

López-Vizcaíno

Sáez

Cañizares

et al. 2012

Separation and Purification Technology

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The work described here concerns the electrochemical coagulation of effluents obtained in a surfactant-aided soil-remediation processes, in which phenanthrene was extracted from a clay soil using a sodium dodecyl sulphate solution as the solubilising fluid. The results show that the efficiency of the processes is largely influenced by the electrode materials employed in the electrocoagulation process and also by the initial pH of the treated effluents. Different cases have been studied, including synthetic effluents from soil-washing and electrokinetic soil-flushing. This technique is particularly effective in the treatment of the strongly acidic effluents arising from electrokinetic surfactant-aided soil-flushing of polluted soils using aluminium electrodes (anodes and cathodes). Under these conditions, in addition to a high level of pollution removal, this technology provides a significant reduction in the conductivity and partial neutralization of the effluent.

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“…Recent studies have shown, however, that foundry slag may be more reactive than previously thought and may be a source of heavy metal contamination in surface water, soil and groundwater [6][7][8].…”

Section: Introductionmentioning

confidence: 97%

Heavy metal leaching of contaminated soils from a metallurgical plant

Desogus

Manca

Orrù

2013

International Journal of Mining, Reclamation and Environment

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Laboratory tests were carried out to determine the primary parameters affecting the efficiency of the process of leaching heavy metals from natural soil collected inside a metallurgical plant in Italy. The soil samples tested consisted primarily of medium density, fine silica sand that had been contaminated with lead and zinc metallurgical wastes by percolating rainwater. Samples were obtained 1-2 m below ground level in an area where the surface consists of artificial strata composed of soil mixed with metallurgical solid waste. The soil layer tested hosts a low-permeability aquifer (at depths generally greater than 10 m below ground level) that is also contaminated by heavy metals. Batch leaching experiments were conducted using acid solutions (acetic, nitric, hydrochloric and sulphuric) as extracting agents. During leaching tests, concentrations of Zn, Pb, Cd, Cu, Mn and Al were monitored. The results indicate that the best leaching solution varies for all analytes and soil samples examined. Statistical analysis was used to identify correlations between efficiency and leaching rate.

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The use of soil-flushing to remediate metal contamination in a smelting slag dumping area: Column and pilot-scale experiments

Cited by 36 publications

References 29 publications

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Removal of Pb and Zn from contaminated soil by different washing methods: the influence of reagents and ultrasound

Electrocoagulation of the effluents from surfactant-aided soil-remediation processes

Heavy metal leaching of contaminated soils from a metallurgical plant

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