Superfund Innovative Technology Evaluation (SITE)
Note: EPA no longer updates this information, but it may be useful as a reference or resource.
|Biogensis™ Soil Washing
Biogenesis SM developed a soil washing technology that uses patent-pending equipment, surfactants, and water to clean soil, sediment, and sludge contaminated with organic and inorganic constituents. A truck-mounted batch unit processes 20 cubic yards per hour (yds3/hr) of soil particles 10 mesh and larger. A full-scale, mobile, continuous-flow unit cleans sand, silt, clay, and sludge particles smaller than 10 mesh at a rate of 20 to 40 yds3/hr. The process consists of particle sizing equipment, soil and sediment washing units, and water treatment and reconditioning equipment. The sediment washing unit includes a mixing chamber and scrubber to loosen the bonds between pollutants and the particles. Settling tanks and hydrocyclones are used to improve particle separation. Solids are sent to a treated soil pile. Liquids are treated and recycled to the plant for reuse. Equipment configurations vary depending on the soil matrix. The technology extracts inorganics, volatile and non-volatile organic contaminants, PCBs, and pesticides. In November 1992, this technology was demonstrated on weathered crude oil at a refinery site in Minnesota. Approximately 85 percent of the total recoverable hydrocarbons (TRPH) were removed.