 | Claim Listing
If this is your listing you must be registered and logged in to claim. If you are logged in you will see an icon similar to this  to the left that you will click to claim the listing. Once a listing has been claimed it can be edited. You must be logged in to edit a listing. |
| Environmental Technology Listing |
Title of Listing: | | Alternative Remedial Technologies, Inc. (ART) - Soil Washing |
Category: | | Treatment Technologies |
Subcategory: | * | Soil, All Listings |
Media: | | Soil, Sediment |
Contaminants: | | Organics, SVOCs, PNAs, Pesticides, PCBs, Chlorinated Hydrocarbons, Inorganics, Heavy Metals, Cyanides, Radioactive Materials |
Web Site: | | http://www.gmgw.com/ART |
Email: | | mimann@aol.com |
Technology Description: | |
Soil washing is a physical/chemical process to remove contaminants that reside in specific grain-size domains. It is a batch process and separates the wastestream into "cuts" and focuses on treatment appropriate to the contaminant/grain-size relationship.
Prior to treatment, oversize materials are separated from the contaminated soil with a series of vibrating screens. Wet screening is then applied to form a slurry which is pumped to the hydrocyclones. The hydrocyclones mechanically separate the slurry into two streams, the underflow and the overflow. The underflow, which contains the coarse-grained material, is directed to the froth flotation cells where it is washed with surfactants. The flotation cells are mechanically aerated and the combined effects of aeration and surfactant washing generate a heavy froth that floats to the top of the cells. The overflow (the fines and water) is treated like an industrial effluent. The waste stream is directed to a sludge basin where solids are allowed to settle. The resulting sludge is dewatered using a belt filter press and may then be further treated or disposed.
The advantages of using the Alternative Remedial Technologies, Inc. (ART) soil washing system over more conventional cleanup methods are many. The system is exceptionally cost-effective since treatment is focused on the contaminated fraction only, thus minimizing the volume of material to be disposed of off-site. Of the total volume of feed material, only 5-8 percent will require disposal at a treatment, storage, and disposal facility. Typically, approximately 85 percent of the feed material can be returned to the site as clean. It is a true volume reduction option and directly supports the recycle and reuse of site materials.
A wide spectrum of contaminants can be treated with this soil washing system, including semivolatile organics, polynuclear aromatics (PNA), pesticides, polychlorinated biphyenyls (PCB), chlorinated hydrocarbons, and inorganics such as heavy metals, cyanides, and radioactively contaminated materials. The system can effectively treat both organics and inorganics in the same treatment process.
The system is modular and transportable and can be set up on a site in two weeks. Only water and electricity are required. There is no effluent water to be treated as all water is recycled to the wet scrubber. The plant is relatively easy to operate, and its flexibility is such that it does not need to be kept running 24 hours per day, as is the case with an incinerator, for example. If required, the plant can operate on a 7 days per week/24 hours per day schedule.
ART has performed treatability studies on soils contaminated with PCBs, VOCs, mercury, lead, pesticides, TPH, PAH, PNA, arsenic, and chromium. Permitting is not usually required for field operations.
In 1992, the firms of Geraghty & Miller, Inc. (USA) and Heidemij Realisatie (The Netherlands) formed a joint venture and were incorporated as Alternative Remedial Technologies, Inc. (ART) to bring the Heidemij soil washing system to the U.S.
|
| | |
Performance Status/
Limitations: | |
This method of treatment is most economically effective on soils that are no more than 30 percent clay or silt. As the proportion of the fine-grained material increases, the wastestream becomes more difficult to process, which adds to the cost. Full-scale soil washing is competitive with other remediation technologies on projects that require cleanup of more than 20,000 tons. Smaller volumes of soil can be processed with ARTs 5-10 tons per hour pilot plant.
Volatile organics will normally be removed prior to introduction of the soil into the treatment unit.
|
Topics
Technologies, Characterization
Additional Topics/Tags/Keywords
Soil Washing, Soils, Particle Separation, Mobile System, Organics, Inorganics, Surfactants |
Organization: | | Alternative Remedial Technologies, Inc. |
Address: | | 14497 North Dale Mabry Highway
Suite 240 | Phone: | Description | Number |
City: | | Tampa | | Primary | (813) 264-3506 |
State/Province/Territory: | | FL | 2. | | |
Zip/Postal Code: | | 33618 | 3. | | |
Country: | | United States | 4. | Fax: | (813) 962-0867 |
Branch Locations: | |
|
|
|