Soil remediation process and system

Details Soil remediation process and system Soil remediation process and system

B - Operations, Transporting

08

B

B08B 7/00 (2006.01) B09C 1/06 (2006.01) C08L 95/00 (2006.01) C10B 51/00 (2006.01) C10G 1/00 (2006.01) F26B 23/00 (2006.01) F26B 25/00 (2006.01)

Patent

CA 2049947

Process and apparatus for near-zero discharge soil remediation, preferably in conjunction with an asphalt plant, compris- ing heating soil contaminated with up to about 30,000 ppm light hydrocarbons in an inclined, axially-fired rotating separator, and sampling the output soil to determine the remaining contaminants. If below 100 ppm (preferably 10 ppm) it may be reem- placed as clean fill. If it does meet D.O.T./CALTRANS standards and is below about 100 ppm it may be used as roadbed fill. If between about 1000 and 100 ppm and meets standards it may be used as aggregate, being mixed with hot oil to form asphalt. The separator offgases are condensed, the reclaimed liquid hydrocarbons separated and combined with the hot oil. The hot condenser offgases are supplied as secondary air to a main dryer, improving efficiency of operation. A dust/mud blow down system clears the heat exchange plenums with compressed air.

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