Vapor collection and treatment of off-gas from an in-situ thermal desorption soil remediation system

Abstract

An in situ thermal desorption system may be used to remove contamination from soil. Off-gas removed from the soil may be transported from the soil to a treatment facility by high temperature hoses and plastic piping. The use of high temperature hose and plastic pipe may reduce the capital cost, installation cost, and operating cost as compared to conventional transport systems from thermal desorption soil remediation systems. The high temperature hose and plastic pipe are highly resistant to corrosion caused by the off-gas. The treatment facility may separate the off-gas into a liquid stream and a vapor stream. The liquid stream and the vapor stream may be processed to reduce contaminants within the liquid stream and vapor stream to acceptable levels.

1 - 32 . (canceled)  
   
   
       33 . A method for treating off-gas from a suction well of a soil vapor extraction system, comprising: 
 condensing the off-gas to form a liquid stream and a vapor stream;    treating the liquid stream; and    treating the vapor stream.    
   
   
       34 . The method of  claim 33 , wherein treating the liquid stream comprises: separating the liquid stream into an aqueous stream and a non-aqueous stream; and passing the aqueous stream through an activated carbon bed to remove contaminants from the aqueous stream.  
   
   
       35 . The method of  claim 34 , further comprising oxidizing contaminants within the non-aqueous stream.  
   
   
       36 . The method of  claim 33 , wherein treating the vapor stream further comprises passing the vapor stream through an activated carbon bed to remove contaminants from the vapor stream.