Patent ID: 7674946
Filing Date: 2010-03-09
Classification: B09C,F23G

Abstract:
1. A method of remediating a soil contaminated with polyhalogenated hydrocarbons, comprising the steps of: (a) removing and sieving said soil to remove stones and gravel; (b) regulating the moisture content of said sieved soil to a value of 10-30%; (c) feeding a continuous stream of said soil into a turbo-heater (T) comprising a cylindrical tubular body closed by end walls at its opposite ends, provided with a heating jacket, at least one inlet opening, at least one outlet opening and an inner wall, and onto the interior of which a coaxial bladed rotor is rotatably supported, the temperature of the inner wall being 250°-290° C., (d) subjecting the soil stream to the mechanical action of said bladed rotor rotated at a speed of at least 200 rpm, with the consequent centrifugation of said soil against said heated wall, which determines the instantaneous generation of a steam stream, and conveyance of said soil and steam streams towards said at least one outlet opening, and (e) continuously discharging a soil stream having a moisture content of less than 1% and substantially free of said polyhalogenated hydrocarbons.