Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
|Mobile Volume Reduction
Unit at the Escambia Superfund Site
RREL's VRU is a pilot scale, mobile soil washing system designed to remove organic contaminants from soil through particle size separation and solubilization. The VRU can process 100 pounds of soil (dry weight) per hour. The process subsystems include soil handling and conveying, soil washing and coarse screening, fine particle separation, flocculation/clarification, water treatment, and utilities. The VRU is controlled and monitored with conventional industrial process instrumentation and hardware. The VRU can treat soils that contain organics such as pentachlorophenol, pesticides, and polynuclear aromatic hydrocarbons. A SITE demonstration of the VRU was conducted in November 1992 at the Escambia Wood Treating Company in Pensacola, Florida. During the demonstration, the VRU operated at a feed rate of approximately 100 pounds per hour and a wash water-to-feed ratio of about 6 to 1. In the last test condition which had surfactant added and temperature and pH adjusted, average PCP and PAH removal was 97% and 96%, respectively. Feed soil returned as washed soil was 81%. Mass balance of total mass, PCPs and PAHs were 98%, 24%, and 17%, respectively.
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