The Carver-Greenfield Process: dehydration/solvent extraction technology for waste treatment
- Dehydro-Tech Corp., East Hanover, NJ (United States)
A combination dehydration/solvent extraction treatment technology, the proprietary Carver-Greenfield (C-G) Process, can be used to separate solid/liquid waste materials into three separate product streams convenient for reuse or disposal: (1) clean, dry solids suitable for fixation of nonhazardous landfilling; (2) water virtually free of solids and oils which can be processed in an industrial or public wastewater treatment facility; and, (3) oil indigenous to the feed, a mixture of extracted hydrocarbon-soluble compounds which typically includes any hazardous contaminants which are present. As normally practices, this dehydration/solvent extraction technology involves slurrying water-wet waste in a hydrocarbon solvent which extracts indigenous oil from contaminated solid particles and concentrates it in the solvent phase. Dehydration also takes place during the treatment; water is evaporated and condensed as a separate product. Dry solids are reslurried in fresh solvent one or more additional times depending on the degree of extraction required. Extracted solids are centrifuged away from the solvent and residual solvent in the centrifuge cake vaporized off the final product solids stream in a desolventizer. Indigenous oil from the waste is separated from the solvent by distillation with recovered solvent being recycled to the process. This paper discusses the C-G Process flexibility and economics as applied to various hazardous waste examples including PCB contaminated sediments, soils and sludges, spent drilling fluids (US EPA SITE Program), refinery wastes, manufactured gas plant (MGP) sites, etc. 8 refs., 1 fig., 9 tabs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 482269
- Journal Information:
- Environmental Progress, Vol. 15, Issue 3; Other Information: PBD: Fal 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Technology-evaluation report: The Carver-Greenfield Process, Dehydro-Tech Corporation
Refinery sludge treatment/hazardous waste minimization viade hydration and solvent extraction