Feasibility of soil washing agents to remove fluoride and risk assessment of fluoride-contaminated soils

Ahn, Yongtae; Pandi, Kalimuthu; Cho, Dong-Wan; Choi, Jaeyoung

doi:10.1007/s11368-020-02808-8

Cited by 11 publications

(7 citation statements)

References 34 publications

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“…The properties of the natural fluorine-enriched soil used in this study are presented in Tables A1 and A2. The total fluorine concentration in the soil samples (<2 mm) was found to be 1078 ± 178 mg/kg, which exceeds the soil contamination criterion of Korea (Area 2: 400 mg/kg) [25]. Thus, these data confirmed that an appropriate remediation technique was required for this natural fluorine-enriched soil.…”

Section: Characteristics Of Fluorine-natural Enriched Soilsupporting

confidence: 56%

Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica

et al. 2021

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High levels of fluorine in soil may pose health risks and require remediation. In this study, the feasibility of using a practical chemical washing method for the removal of fluorine from an enriched soil was evaluated. The chemical washing procedures were optimized through experimental analyses of various washing solutions and washing conditions (i.e., washing solution concentration, solid–liquid ratio, agitation speed, and reaction time). Additionally, the effects of techniques for improving the washing efficiency, such as ultrasonic washing, aeration, and multi-stage washing, were evaluated. Herein, among all applied methodologies, the maximum washing efficiency achieved for the total fluorine present in soil was only 6.2%, which indicated that chemical washing was inefficient in remediating this particular soil. Further sequential extraction analysis showed that the fluorine in this soil was present in a chemically stable form (residual fraction), possibly because of the presence of mica minerals. It was demonstrated that chemical washing may not be effective for remediating soils containing such chemically stable forms of fluorine. In these cases, other physical-based remediation technologies or risk management approaches may be more suitable.

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Section: Characteristics Of Fluorine-natural Enriched Soilsupporting

confidence: 56%

Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica

et al. 2021

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“…The two important and widely used soil remediation techniques are soil washing and immobilization. Diluted acids such as hydrochloric acid (HCl) and ethylenediamine tetra acetic acid (EDTA) can be used for soil washing treatment [10][11][12][13][14]. The soil washing technique is effective for granular soils as the textutre of the soil is more permeable.…”

Section: Introductionmentioning

confidence: 99%

Design of Soil Remediation Techniques from Column Leaching Test Results

L¹,

Sumalatha

Sunagar

et al. 2022

IJE

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T he soil remediation at a contaminated site requires knowledge of contaminant transport parameters and processes. T his paper presents the determination of transport parameters from column leaching tests in context with two soil remediation techniques i.e., soil washing and immobilization. To evaluate the soil washing technique, t he column leaching tests on the polluted soil were conducted with diluted acid solutions of hydrochloric acid, ethylene diamine tetraacetic acid and ferric chloride to evaluate the leaching efficiencies of the selected leaching solutions. It was observed that the efficiency of diluted ferric chloride solution was higher as it removed the higher percentage of metals from the soil. From these test results, the contaminant transport parameters i.e., retardation factor and dispersion coefficient were determined which are useful to calculate the volume of leaching solut ion that will be required for soil washing at a site. As part of immobilization study on this soil, the soil was mixed with the selected amendments (lime, sodium hydroxide and cement) to increase the pH of the soil to 10 and the retardation factors were estimated through batch leaching test results. The retardation factors of different metals obtained with lime addition were found higher than the other amendments.To analyze the long-term stability of the amended mixtures, the leaching tests were conducted on amended soil samples and the immobilization efficiencies were estimated. It was found that the immobilization efficiencies were higher with lime addition and also concluded that the immobilization effiencies are directly related to retardation factors.

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“…Typical methods for treating F-contaminated soil (i.e., removing F from soil) include soil washing and electrokinetic remediation [18][19][20][21][22][23][24]. Soil washing removes F by leaching it entrapped in, and/or adsorbed on, the soil particles using an acidic or basic washing solution.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, 3 M HCl exhibited the highest removal efficiency (approximately 97%). Meanwhile, Ahn et al [18] reported that 1 M H 2 SO 4 showed the highest removal efficiency (26.7%) in the treatment of F-contaminated soil. The form of F in the soil is believed to have caused the reduced removal efficiency compared to that reported by Moon et al [21].…”

Section: Introductionmentioning

confidence: 99%

Froth-Flotation Separation as an Alternative for the Treatment of Soil Enriched with Fluorine Derived from Mica

Cho

Jung

Lee³

et al. 2022

IJERPH

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Fluorine (F) enrichment originating from natural sources is difficult to remove using chemical washing methods due to the large chemical-resistant residual fraction. This study evaluates the feasibility of using a froth-flotation separation method to remediate soil with a high F concentration caused by mica weathering, and it investigates the optimal conditions for this process, including pH of the slurry, collector dosage, and sample mechanical preparation strategy. The established optimum conditions are pH 3.5, 300 mg/kg collector dosage (tallow amine acetate), which can effectively separate quartz and mica, and a sieving-and-milling strategy that involves discarding particles of size < 0.05 mm, milling those in the range of 0.5–2.0 mm (until < approx. 0.3 mm), and mixing particles with sizes in the range of 0.05–0.5 mm. The target contamination level of 400 mg/kg for the test soil was not met after the first flotation separation process. However, after milling the residue of the first process and subjecting it to a second flotation separation process, the required contamination level was achieved. Consequently, the proposed froth-flotation separation process can be used as a successful alternative technique to remediate F-enriched soils from natural origin that have highly chemical-resistant forms.

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Feasibility of soil washing agents to remove fluoride and risk assessment of fluoride-contaminated soils

Cited by 11 publications

References 34 publications

Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica

Feasibility of a Chemical Washing Method for Treating Soil Enriched with Fluorine Derived from Mica

Design of Soil Remediation Techniques from Column Leaching Test Results

Froth-Flotation Separation as an Alternative for the Treatment of Soil Enriched with Fluorine Derived from Mica

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