Study on a three-dimensional testing method coupling with a leaching behavior model for solidified waste matrix

Abstract

The objective of this study was to develop a three-dimensional leaching method to understand the diffusion behavior of a solidified waste matrix. A cylindrical solidified waste matrix with isotope lead compounds used as a tracer was used to demonstrate the diffusion phenomenon. The leaching test method was coupled with the mathematical diffusion model derived from Duhamel's theorem to control the time-dependent conditions and compute the mass diffusivity and mass generation rate constant of the target pollutants and also simulate the pollutants leached from solidified waste matrix. The simulation value is in fair agreement with experiment.

Keywords:

• Isotope
• diffusion model
• lead
• fly ash
• solidification

Acknowledgment

The authors wish to thank Institute of Nuclear Energy Research Atomic Energy Council, Executive Yuan, Taoyuan County, Taiwan for experimental support.