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Title: The Carver-Greenfield Process: dehydration/solvent extraction technology for waste treatment

Abstract

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 economicsmore » 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.« less

Authors:
;  [1]
  1. Dehydro-Tech Corp., East Hanover, NJ (United States)
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
482269
Resource Type:
Journal Article
Journal Name:
Environmental Progress
Additional Journal Information:
Journal Volume: 15; Journal Issue: 3; Other Information: PBD: Fal 1996
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; INDUSTRIAL WASTES; WASTE PROCESSING; SOLID WASTES; SEPARATION PROCESSES; LIQUID WASTES; PETROLEUM REFINERIES; WASTE MANAGEMENT; DEHYDRATION; DISTILLATION; SOLVENT EXTRACTION; SEWAGE; SLUDGES; HAZARDOUS MATERIALS; CHEMICAL PLANTS

Citation Formats

Trowbridge, T D, and Holcombe, T C. The Carver-Greenfield Process: dehydration/solvent extraction technology for waste treatment. United States: N. p., 1996. Web. doi:10.1002/ep.670150323.
Trowbridge, T D, & Holcombe, T C. The Carver-Greenfield Process: dehydration/solvent extraction technology for waste treatment. United States. doi:10.1002/ep.670150323.
Trowbridge, T D, and Holcombe, T C. Tue . "The Carver-Greenfield Process: dehydration/solvent extraction technology for waste treatment". United States. doi:10.1002/ep.670150323.
@article{osti_482269,
title = {The Carver-Greenfield Process: dehydration/solvent extraction technology for waste treatment},
author = {Trowbridge, T D and Holcombe, T C},
abstractNote = {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.},
doi = {10.1002/ep.670150323},
journal = {Environmental Progress},
number = 3,
volume = 15,
place = {United States},
year = {1996},
month = {12}
}