Waste characterization by leaching and extraction procedures

摘要

Laboratory leaching tests may be used for source term determination as a basis for risk assessment for soil-groundwater pathway. From the results the decision can be taken whether a material is suitable for utilization or not. In order to evaluate different leaching procedures, batch extraction tests and percolation tests were performed using three reference materials produced from contaminated soil, demolition waste and municipal solid waste incinerator bottom ash. Emphasis was placed on the investigation of the leachability of the heavy metals copper and chromium, polycyclic aromatic hydrocarbons (PAHs) and the anions chloride and sulfate. Significant discrepancies between column experiments and batch extraction tests were found for the release of PAHs and to a lesser extent for the heavy metals Cu and Cr.The results from the experimental work will help establish standardized and feasible laboratory procedures as basis for substance specific risk assessment of contaminated sites and will be applied for execution of the planned German Ordinance on Utilization of Mineral Waste Materials.