Process for decontamination
AssigneeStadt Wien
InventorsWalter W. Wenzel, Domy C. Adriano
Life of this patent
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Abstract
Material is decontaminated of a pollutant by using perennial woody plants with the ability to accumulate the pollutant in the leaves in high concentrations. The decontamination is based on a combination of phytoextraction, pollutant transport with the falling of the leaves to the material surface, leaching of the pollutant out of the leaves decomposing on the material surface, and (physico-)chemical fixing of the pollutant in a reactive layer which is bounded by geotextiles and which physically and/or chemically binds the pollutant.
Claims33
A process for decontamination of a material loaded with at least one pollutant selected from the group consisting of heavy metals, metalloids, halides and radionuclides, the process comprising the steps of:
- a) positioning roots of woody plants having leaves in the material loaded with the pollutant and removing the pollutant from the material by phytoexraction by the roots of the woody plants extracting the pollutant from the material and transporting the pollutant to the leave of the woody plants;
- b) applying a layer of a substance which chemically and/or physically binds the pollutant on the surface of the material in an area below the leaves of the woody plants;
- c) collecting and composting the leaves containing the pollutant falling and decomposing on the layer;
- d) leaching the pollutant out of the decomposing leaves on the layer;
- e) physically and/or chemically binding the leached pollutant in the layer;
- and
- f) removing the layer containing the bound pollutant after decontaminating the material.
Dependencies are inferred from the claim text.