Apparatus and method for low temperature thermal stripping of volatile organic compounds from soil with non-oxidative cross-sweep gases
US5072674A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1990 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Dec 13, 2010 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF23G2201/50
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A method and apparatus for removing volatile organic contaminants from soil including removing contaminated soil from the earth; transporting and placing the contaminated soil into a soil hopper, the hopper being substantially sealed from the atmosphere to prevent fugitive emissions of the contaminants from escaping into the atmosphere; conveying the soil under sealed conditions into a heated vapor stripping conveyor having moving flights; conveying the soil under sealed conditions along the vapor stripping conveyor and in close contact with the flights to heat the soil to a temperature below the boiling temperatures of the contaminants, thereby causing moisture in the soil and the contaminants to be stripped from the soil; streaming non-oxidizing gases having a greater than ambient temperature across the surface of the soil to carry the contaminants and moisture across and away from the soil; and maintaining the rate of flow and temperature of the gases to prevent undue surface drying of the soil as the soil passes through the conveyor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.