Effect of interface equilibrium in a semi-dynamic leaching test of geomaterials
Effect of interface equilibrium in a semi-dynamic leaching test of geomaterials
A good understanding of the leaching mechanisms of potentially toxic substances released from recycled geomaterials is crucial for estimating their environmental impact. Semi-Dynamic Leaching Tests (SDLTs) such as ANS 16.1, NEN 7375, and prEN 16637-2 are serial batch-type leaching tests with repeated replacements of the entire liquid phase according to a programmed schedule. This study discusses several issues of leaching behavior in SDLTs. In addition to the monolith specimen, granules and clays that have low diffusion coefficients can indicate diffusion-controlled release. However, the leaching mechanisms observed in SDLTs are not necessarily diffusion-controlled. To explain the unidentified leaching mechanisms, we used a model that linked solid-liquid interface equilibrium and intra-solid diffusion. The model could reproduce various leaching behaviors, suggesting the need for further attention to the interface equilibrium in the field of leaching research.
Hirofumi Sakanakura; Y. Imoto; Shoji Ogawa; S. Inoba
9th International Congress on Environmental Geotechnics (ICEG2023)
Contaminant Fate and Transport
Soil Dynamics, Geoenvironmental Engineering
https://doi.org/10.53243/ICEG2023-386
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