Physical and chemical phenomena affecting the leachability of elements in solid wastes

Fluidized-bed column method for automatic dynamic extraction and determination of trace element bioaccessibility in highly heterogeneous solid wastes

“…Therefore, batchwise TCLP does not ensure the quantitative release of trace elements in bottom ash under the action of the extractant. This observation along with the fact that manual leaching tests methods might not reach steady-state conditions at the end of the endorsed stirring time [51] could explain the poor repeatabilities attained. On the contrary, dynamic column extraction is conducted at the nominal pH of the extractant as a result of the steady renewal of the leaching phase, which gives rise to better reproducibility and more accurate quantitation of potentially mobilizable pools of trace elements in worse case scenarios.…”