Effects of colloidal particles on the results and reproducibility of batch leaching tests for heavy metal-contaminated soil

Yasutaka, Tetsuo; Imoto, Yukari; Kurosawa, Akihiko; Someya, Masayuki; Higashino, Kazuo; Kalbe, Ute; Sakanakura, Hirofumi

doi:10.1016/j.sandf.2017.08.014

Cited by 22 publications

(4 citation statements)

References 10 publications

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“…Importantly, these results confirm previous reports that the 0.45 µm filter is not sufficient to completely remove suspended particles, which affects evaluations of the mobility of certain toxic elements such as Pb (e.g., Yasutaka et al 2017;Imoto et al 2018;Ito et al 2018).…”

Section: Factors Controlling the Dissolved Concentrations Of Toxic Elsupporting

confidence: 89%

Leaching characteristics of naturally derived toxic elements in the alluvial marine clay layer beneath Osaka Plain, Japan: implications for the reuse of excavated soils

2019

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Section: Factors Controlling the Dissolved Concentrations Of Toxic Elsupporting

confidence: 89%

Leaching characteristics of naturally derived toxic elements in the alluvial marine clay layer beneath Osaka Plain, Japan: implications for the reuse of excavated soils

2019

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“…Colloids could have passed through the filter during the liquid-solid separation step, and so may have affected the measured concentrations in the eluate [ 28 , 29 , 30 ]. To confirm the effect of colloids, eluates obtained using a 0.45 μm pore size filter (0.45 MF) were refiltered using a 0.1 μm pore size filter.…”

Section: Resultsmentioning

confidence: 99%

Determining Adsorption Parameters of Potentially Contaminant-Releasing Materials Using Batch Tests with Differing Liquid-Solid Ratios

et al. 2021

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Adsorption parameters such as the distribution coefficient are required to predict the release behavior of contaminants using advection-dispersion models. However, for potentially contaminant-releasing materials (PCMs) such as dredged sludge and coal ash, these parameters cannot be obtained by conventional adsorption tests. This study developed a method to determine adsorption parameters for PCMs from a set of batch tests conducted in parallel as a function of the liquid-solid ratio (LS-parallel test). This LS-parallel test was performed on sandy soil derived from marine sediment using liquid-solid ratios from 1 to 300 L/kg. The water-contact time was also changed from 10 min to 28 d to elucidate the kinetics or equilibrium of contaminants released from the sample. Adsorption parameters were successfully obtained if the substance was under adsorption control. A column percolation test was performed to confirm the effectiveness of the obtained parameters. Good agreements were observed for SO42− and B, but discrepancies remained for other substances such as F− and as suggesting that improvements are necessary in both the LS-parallel test procedure and the advection-dispersion model.

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“…A 10.0 g sample is mixed with 25 mL deionized (DI) water via magnetic stirring for 1 h. Then, the pH of solutions is determined with a pH meter. To analyze the HM concentration in RM, 250 mL 1 M HCl was mixed with 7.50 g dry RM at 200 rpm for 2 h. − Moreover, based on Japan standard leaching test (JSLT), 100 mL DI water and 10.0 g dry RM were mixed at 200 rpm for 6 h to examine its HM leaching concentration . The obtained leachates were tested by inductively coupled plasma–mass spectrometry.…”

Section: Methodsmentioning

confidence: 99%

Dual Ions Neutralized and Stabilized Red Mud for Chromium(VI) Polluted Soil Remediation

et al. 2022

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Both alkaline heavy metal (HM) contaminated red mud (RM) recycling and Cr(VI) polluted soil remediation are severe hazardous environmental problems. Herein, we developed a novel integrated approach to neutralize and stabilize the hazardous RM via the introduction of Ca2+ and Cl– dual ions. When 3% CaCl2·2H2O is added, the pH of RM is reduced from 11.0 to 8.9, and the Pb, Cr, Zn, Cu, and As leaching concentrations from RM are suppressed lower than the environmental standards of China and the World Health Organization (Pb, Cr, Zn, Cu < 0.50 mg/L; As < 10 μg/L). Detailed mechanism studies reveal that the pH neutralization is attributed to the novel OH– flocculation effect ascribing to Ca2+ charge neutralization and Cl– promoted proton neutralization. Furthermore, as the pH decreases, the HM adsorption capacity of RM is enhanced, achieving stable HM immobilization. The treated RM can be further employed to remediate Cr(VI) contaminated soil (Cr concentration 570 ppm; treated RM weight percentage in soil 5.0%), which can suppress 56.0% Cr mobility in soil and 68.4% bioaccumulated Cr in the harvested vegetables. Overall, this work demonstrates an ecofriendly “waste-to-soil remediation” strategy to solve both the solid waste and soil pollution problems.

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Effects of colloidal particles on the results and reproducibility of batch leaching tests for heavy metal-contaminated soil

Cited by 22 publications

References 10 publications

Leaching characteristics of naturally derived toxic elements in the alluvial marine clay layer beneath Osaka Plain, Japan: implications for the reuse of excavated soils

Leaching characteristics of naturally derived toxic elements in the alluvial marine clay layer beneath Osaka Plain, Japan: implications for the reuse of excavated soils

Determining Adsorption Parameters of Potentially Contaminant-Releasing Materials Using Batch Tests with Differing Liquid-Solid Ratios

Dual Ions Neutralized and Stabilized Red Mud for Chromium(VI) Polluted Soil Remediation

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