Remediation of metal-contaminated urban soil using flotation technique

Dermont, Gérald; Bergeron, Mario; Richer-Laflèche, Marc; Mercier, Guy

doi:10.1016/j.scitotenv.2009.11.036

Cited by 54 publications

(29 citation statements)

References 24 publications

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“…Furthermore, in the present study, the general order of transition metal recovery with pH was Zn = Cu > Pb. These results are consistent with those reported by Cauwenberg and Dermont (Vanthuyne et al, 2002;Dermont et al, 2010). The precipitation flotation of heavy metals increased with the enhancement of ventilation velocity (Fig.…”

Section: Precipitation Flotation Of Heavy Metals In the Residual Slurrysupporting

confidence: 93%

“…When large particles are consumed, the particle spacing is increased and reduces the collision between fine particles, which may further reduce the recovery efficiency (Vanthuyne et al, 2002). Furthermore, in a late reaction process, an insufficiency of the collector can produce a slow reaction; this is consistent with the literature (Dermont et al, 2010).…”

Section: Precipitation Flotation Of Heavy Metals In the Residual Slurrysupporting

confidence: 85%

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Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Liu

Wei

et al. 2017

Aerosol Air Qual. Res.

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Application of two-step flotation for removing dioxins and heavy metals from hospital solid waste incinerator (HSWI) fly ash was studied. In the first step, decarburization flotation was executed to remove dioxins from raw fly ash. The second step of precipitation flotation was carried out to recycle the toxic metals in the residual slurry. Finally, an acid leachingsulphide precipitation-flotation method was proposed. The results showed that carbon removal rate was 90.7%, and the dioxin removal percentage was 91.0% during decarburization flotation. And Zn, Pb and Cu in residual slurry were acidleached with the removal efficiencies being 91.3%, 79.2% and 85.6%, respectively. The optimum sulphidation condition of heavy metals in the residual slurry were Na 2 S molar ratio of 1.4 and sulphidation time of 30 min. Subsequently, precipitation flotation could recover 49.9% of Zn, 42.0% of Pb and 48.7% of Cu from the raw fly ash. After the two-step flotation, the toxicity of the tailings reduced considerably, and the tailings could be disposed in landfill. Therefore, this twostep flotation treatment of HSWI fly ash may result in both detoxification and potential resource recovery.

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Section: Precipitation Flotation Of Heavy Metals In the Residual Slurrysupporting

confidence: 93%

Section: Precipitation Flotation Of Heavy Metals In the Residual Slurrysupporting

confidence: 85%

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Liu

Wei

et al. 2017

Aerosol Air Qual. Res.

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“…A soil washing procedure via magnetic separation proved effective at removing a significant amount of some of the contaminants present in the soil, affording the recovery of 59.83% Cu, 22.38% Pb, 92.44% Zn, 49.87% As, and 74.17% Fe (Sierra et al, 2014). The combination of soil washing and separation, which recovered 42%-52% of the total metals and reduced soil volume by over 80%, has also received attention by Dermont et al (2010). Based on our work, optimal grading standards and washing times for practical remediation were selected to achieve the goals of high efficiency, reduced energy consumption, and cost-effectiveness, which the original soil should be sieved into three grades (> 2, 2-0.1, and < 0.1 mm) with washing times of 80, 25, and 40 min, respectively.…”

Section: Evaluation Of Soil Washing Combined With Sieving Technologymentioning

confidence: 99%

“…These technologies include sieving, centrifugation, flocculation, hydrocyclone classification, magnetic separation, and flotation. As these technologies concentrate contaminants into smaller volumes, they have been applied in the field of soil remediation in recent years (Dermont et al, 2010;FRTR, 2007). Lin et al (2001) removed 84%-88% Pb from soil by jigging and density separation, and achieved the efficient removal of Pb by soil washing.…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metals and arsenic from a co-contaminated soil by sieving combined with washing process

Liao

Yan

2016

Journal of Environmental Sciences

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Batch experiments were conducted with a heavy metals and arsenic co-contaminated soil from an abandoned mine to evaluate the feasibility of a remediation technology that combines sieving with soil washing. Leaching of the arsenic and heavy metals from the different particle size fractions was found to decrease in the order: < 0.1, 2-0.1, and > 2 mm.With increased contact time, the concentration of heavy metals in the leachate was significantly decreased for small particles, probably because of adsorption by the clay soil component. For the different particle sizes, the removal efficiencies for Pb and Cd were 75%-87%, and 61%-77% for Zn and Cu, although the extent of removal was decreased for As and Cr at <45%. The highest efficiency by washing for Pb, Cd, Zn, and As was from the soil particles >2 mm, although good metal removal efficiencies were also achieved in the small particle size fractions. Through SEM-EDS observations and correlation analysis, the leaching regularity of the heavy metals and arsenic was found to be closely related to Fe, Mn, and Ca contents of the soil fractions. The remediation of heavy metal-contaminated soil by sieving combined with soil washing was proven to be efficient, and practical remediation parameters were also recommended.

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“…There are two possible phenomena: if the result is a dense colloid, it is separated by filtration, or by sedimentation; if the resulting colloid has a density lower than water, it is separated by flotation and the process is called flocculation 16 . Coagulation and flocculation followed by sedimentation, filtration or flotation are employed commonly in wastewater treatment to remove a wide variety of pollutants in industrial and urban waste waters.…”

Section: Coagulation Processesmentioning

confidence: 99%

Bioelectrochemical metal recovery with microbial fuel cells

Motos¹

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Remediation of metal-contaminated urban soil using flotation technique

Cited by 54 publications

References 24 publications

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Two-Step Flotation Treatment for Removal of Toxic Matter from Hospital Solid Waste Incinerator Fly Ash

Removal of heavy metals and arsenic from a co-contaminated soil by sieving combined with washing process

Bioelectrochemical metal recovery with microbial fuel cells

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