High vacuum extraction of soil contaminants along preferential flow paths
US5655852A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1996 |
| Grant date | Aug 12, 1997 |
| Priority date | — |
| Expiry date | Nov 18, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB09C2101/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed is a process and apparatus for removing contaminants from a contaminated area of the ground, the ground having a plurality of paths of preferential flow at different depths, which process comprises providing a borehole in the contaminated area to intersect at least a first path of preferential flow and a second path of preferential flow; placing in the borehole a first vacuum extraction pipe having a bottom opening situated within the first path of preferential flow and a second vacuum extraction pipe having a bottom opening situated within the second path of preferential flow; isolating the first path of preferential flow from the second path of preferential flow so that a vacuum applied to the first vacuum extraction pipe will extract gases and liquids from only the first path of preferential flow, and a vacuum applied to the second vacuum extraction pipe will extract gases and liquids from only the second path of preferential flow; applying a vacuum to at least one of the vacuum extraction pipes to draw gases and liquid from at least one of the paths of preferential flow into a vacuum extraction pipe and transport the gases and liquid to the surface as a common stream;…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.