Long-term leaching prediction of constituents in coal bottom ash used as a structural fill material

Lee, Hosub; Yu, Gihyeon; Choi, Yongju; Jho, Eun Hea; Nam, Kyoungphile

doi:10.1007/s11368-017-1709-1

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…To this end, Reference [ 9 ] reviewed numerical models of the release of contaminants from PCMs. The single-mode first-order decay model [ 10 , 11 , 12 ] is the simplest model in which the outlet eluate concentration decreases exponentially. Non-precipitating and non-adsorbing substances can be applied to this model, assuming that the total amount of a substance is dissolved in a complete mixing box simulating pore water, and that it is gradually diluted and flows out along with freshwater inflow.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…It is known that the short-term leaching can over- or under-estimate the potential leaching of contaminants, which might provide the misled information for the decision makers. 15 Thus, the long-term leaching test is extremely needed to be conducted in this study. To date, multiple leaching protocols have been proposed to evaluate the leaching characteristics of the building and waste materials.…”

Section: Introductionmentioning

confidence: 99%

Long-term leaching behaviours of cement composites prepared by hazardous wastes

Yang

Liu

et al. 2018

RSC Adv.

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Prediction of long-term heavy metal leaching from dredged marine sediment applied inland as a construction material

Kim

Yang

Nam

et al. 2018

Environ Sci Pollut Res

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Column leaching studies have been suggested as a reference for site-specific prediction of the long-term leaching characteristics of trace constituents in granular materials used as construction materials. In this study, the concept of the long-term leaching prediction using column studies is applied for dredged marine sediment impacted by heavy metals. The column studies show tailing of the liquid to solid ratio-dependent heavy metal leaching for sediment after heavy metal treatment by acid washing. A dual-mode first-order decay model, applied for the first time in this study for column leaching studies, is able to reproduce the leaching characteristics observed. A procedure for long-term leaching prediction using the dual-mode model is developed and applied to a virtual field scenario for which the sediment is beneficially used as a construction material. The prediction results show that by more accurately reproducing the column study results, the dual-mode model generally predicts greater long-term heavy metal loading to the underlying soil layer and longer duration of leaching than the single-mode model. The heavy metal leaching observed in the columns does not show any correlation with the sequential extraction procedure and toxicity characteristic leaching procedure (TCLP) results, suggesting that the column leaching test should be considered to be independent of such batch test procedures.

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Long-term leaching prediction of constituents in coal bottom ash used as a structural fill material

Cited by 9 publications

References 22 publications

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

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

Long-term leaching behaviours of cement composites prepared by hazardous wastes

Prediction of long-term heavy metal leaching from dredged marine sediment applied inland as a construction material

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