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Environmental Technology Listing
Title of Listing:
Carver-Greenfield Process
Category:
Treatment Technologies
Subcategory:
 *Water, Waste, Soil, All Listings
Media:
Sludges, Solids, Liquids
Contaminants:
Semivolatiles, Oils
Web Site:
Email:
Technology Description:

SOLVENT EXTRACTION

          The Carver-Greenfield (C-G) Process is an innovative, well-proven process which can be applied at Superfund sites for cleanup of hazardous sludges, contaminated solids, or other industrial wastes. This unique process efficiently separates hazardous solid/liquid feed materials into three product streams convenient for disposal: (1) a clean, dry solid, (2) a water product virtually free of solids and oils, and (3) a concentrated mixture of the extracted compounds. The first step in the process involves slurrying the feed with a recirculating water-immiscible solvent at a ratio of 5-10 pounds solvent/pound solids. The slurry is then circulated through an energy-efficient evaporator system to evaporate virtually all of the water. After drying, the slurry is sent to a centrifuge to separate most of the solvent from the solids. The solids are reslurried with clean solvent one or more times, as required, to achieve the required degree of extraction of the hazardous compounds.

          After final centrifugation, residual solvent is removed from the solids by evaporation and stripping. The hazardous constituents are removed from the solvent by distillation and can be incinerated or reclaimed. In some cases, heavy metals in the solids may be solubilized by additives in the solvents and can subsequently be extracted by the solvent. The recovered solvent is reused in the process. The full-scale system is normally continuous, but can be operated in a batch or semicontinuous mode depending on the particular process/capacity requirements.
Performance Status/
Limitations:

Performance Status:

          In the last 30 years, over 80 commercial C-G Process facilities have been licensed in a dozen countries to solve waste disposal problems in a wide variety of fields. More than half of the plants were designed to dry and remove oil from slaughterhouse wastes (rendering plants). The other units are used to evaporate water and extract indigenous oil-soluble compounds from a broad spectrum of materials, including municipal and industrial sewage sludges, wool scouring wastes, petrochemical sludges, wood pulp wastes, pharmaceutical wastes, dairy and food products, textile and dye wastes, animal manure, etc.

          A successful pilot plant demonstration under the SITE Program was carried out in summer 1991 to separate oily drilling muds into their constituent oil, water, and solid phases. Other soil remediation tests have also been carried out.

          Limitations:

          Feeds to the process must include solids (5 to 95 percent), water (5 to 95 percent) and oil soluble contaminants (percentage level to over 75 percent) to maximize its capability. While volatile organics (boiling points below 350 degrees Fahrenheit) can be processed and recovered, the technology is more appropriate for semivolatile boiling points above 350 degrees F) and non-volatile organics. Note that the technology separates and concentrates feeds into solids, water and oil-soluble streams but does not destroy them. The separation reduces volume and facilitates further treatment/disposal.
Topics
Technologies, Treatment/Remediation
Additional Topics/Tags/Keywords
Chemical Extraction/Separation, Oils, Organics

Organization:
DEHYDRO-TECH CORPORATION
Address:
6 Great Meadow Lane
Phone:
DescriptionNumber
City:
East Hanover
1.
Primary (201) 887-2182
State/Province/Territory:
NJ
2.
Zip/Postal Code:
07936
3.
Country:
United States
4.
Fax:(201) 887-2548
Branch Locations: