Decontamination of sites where organic compound contaminants endanger the water supply
US4892664A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 28, 1987 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Jul 28, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC02F1/645
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method and system for decontaminating water, e.g., groundwater or process effluent, which is contaminated by small concentrations, e.g., in the range of 0.01 to 100 ppm, of dissolved volatile organic compounds (VOCs) includes introducing a flow of the water to an air stripping stage in which the water is directed through a packed column and air is directed through the column to air-strip organic molecules from the contaminated water; releasing the thus decontaminated water substantially free of the compounds to the environment; pretreating the organic compounds-carrying air in the substantial absence of water particles by a preheater; passing the heated air through a catalytic stage that oxidizes the organic compounds, and releasing the gaseous effluent from the catalytic stage to the atmosphere substantially free of organic contaminants. A system for decontaminating water contaminated by small concentrations of dissolved volatile organic compounds is also described, which includes apparatus for retrofitting an existing air stripper for this purpose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.