초록 ▼

A method for separating volatilizable contaminants from soil by introducing the soil into a rotary aggregate dryer through which a working gas indirectly heated to between 750°F. and 1800°F. is drawn to vaporize the contaminants, and for recovering the contaminants for environmentally sound disposal

A method for separating volatilizable contaminants from soil by introducing the soil into a rotary aggregate dryer through which a working gas indirectly heated to between 750°F. and 1800°F. is drawn to vaporize the contaminants, and for recovering the contaminants for environmentally sound disposal or recycling by downstream treatment of the effluent drawn off from the dryer. The downstream treatment includes cooling the effluent to condense and precipitate out a substantial portion of the contaminants and passing the effluent through activated carbon.

대표청구항 ▼

A method for separating and recovering volatilizable contaminants from soil comprising the steps of: introducing the soil into a rotating aggregate dryer; indirectly heating a working gas to a temperature of between 750°F. and 1800°F. by passing said working gas through a heat exchanger; volatilizin

A method for separating and recovering volatilizable contaminants from soil comprising the steps of: introducing the soil into a rotating aggregate dryer; indirectly heating a working gas to a temperature of between 750°F. and 1800°F. by passing said working gas through a heat exchanger; volatilizing said contaminants and the moisture in the soil by passing said heated working gas through said dryer, whereby said working gas, said volatilized contaminants and moisture, and entrained soil particulates form an effluent; drawing off said effluent from said dryer; filtering said entrained soil particulates from said effluent; subsequently condensing a substantial portion of said volatilized contaminants and moisture from said effluent to form a first liquid waste stream by cooling said effluent; collecting said first liquid waste stream; after condensing a substantial portion of said volatilized contaminants and moisture from said effluent, passing said effluent through activated carbon to remove substantially the remaining volatilized contaminants from said effluent; and after volatilizing said contaminants and moisture in the soil in said dryer, discharging said soil from said dryer.