Curbing toxic emissions from remediated substrate
US10751771B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 4, 2018 |
| Grant date | Aug 25, 2020 |
| Priority date | — |
| Expiry date | Dec 4, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB09C2101/00
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A process for curbing of emissions of toxic metals and chelating agent from remediated soils, sediments and other substrates contaminated with toxic metals, said process comprising: (a) remediation of contaminated soil, sediment and other substrate with washing solution, said washing solution comprising EDTA or other chelating agent from the group of aminopolycarboxylic acids and their salts and mixtures thereof; (b) addition of 0.05-5% (w/w, dry weight) of zero-valent Fe or Fe compounds from the group of Fe-oxides and Fe-oxide-hydroxides into the slurry phase of soil, sediment and other substrate; (c) mixing of Fe-amended slurry; (d) separation of solid phase of remediated and Fe-amended soil, sediment and other substrate; (e) ageing of remediated and Fe-amended soil, sediment and other substrate for 0.5-45 days.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.