Full-scale soil washing/TERRAMET{reg_sign} soil leaching
- COGNIS, Inc., Santa Rosa, CA (United States)
COGNIS TERRAMET{reg_sign} soil leaching and Bescorp soil washing systems have been successfully combined to remediate an ammunition test burn area at the Twin Cities Army Ammunition Plant (TCAAP), New Brighton, MN. This cleanup is the first in the country to combine these two technologies, and this approach offers a permanent remedial solution. In Fall 1993, 1,600 tons of soil were remediated with an additional 10,000+ tons treated in 1994. The cleaned soil remained on-site, and the heavy metal contaminants were removed, recovered, and recycled. Eight heavy metals were removed from the contaminated soil achieving the very stringent cleanup criteria of <175 ppm for residual lead and achieving background concentrations for seven other heavy metals (antimony, cadmium, chromium, copper, mercury, nickel, and silver). In addition, both live and spent ordnance had to be removed in the soil treatment plant to meet the cleanup criteria. No hazardous waste requiring landfill disposal was generated during the entire operation. At TCAAP the Bescorp soil washing system separated the feed soil into three fractions: oversize, sand, and fines. The oversize fraction was clean and discharged from the plant for redeposition on-site after removal of the live and spent ammunition. The sand fraction contained sand-sized fragments of lead and copper and was subjected to density separation techniques to remove the majority of these metal fragments. Both the fines and density-pretreated sand streams were then leached in two parallel leaching circuits. The COGNIS TERRAMET heavy metal extraction process leached and recovered heavy metals, and particularly lead and copper, from contaminated soil with a proprietary aqueous leaching solution. Only by combining both the metal fragment removal and leaching did the soil meet the stringent cleanup criteria.
- OSTI ID:
- 96666
- Report Number(s):
- CONF-9504134-; TRN: 95:005315-0015
- Resource Relation:
- Conference: HAZMACON `95: hazardous materials management conference and exhibition, San Jose, CA (United States), 4-6 Apr 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of HAZMACON `95: Hazardous materials management conference and exhibition; Bursztynsky, T.; Loss, M.L.; PB: 790 p.
- Country of Publication:
- United States
- Language:
- English
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