Method of soil remediation by concurrent removal of hydrocarbons and fixation of heavy metals
US5882429A · kind A · utility
6Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 25, 1997 |
| Grant date | Mar 16, 1999 |
| Priority date | — |
| Expiry date | Jul 25, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB09C1/08
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
The invention disclosed relates to an improved solvent extraction/soil remediation process for the concurrent removal of hydrocarbon contaminants, and fixation of heavy metals. The improvements include selecting the metal fixation agent for improved hydrocarbon extraction efficiency, and reducing the number of extraction stages to four or five by breaking down and reforming the soil agglomerates between stages,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.