System for recovering organic solvent in soil

A system for recovering an organic solvent contaminant in a soil, comprising:

• means for sucking a gas containing the organic solvent contaminant from the soil contaminated by the organic solvent, comprising a solvent collecting tube inserted into the soil and a vacuum device connected to the solvent collecting tube for vacuum sucking the gas containing the organic solvent from the soil;
• and
• a gas treating apparatus connected to a discharge side of the vacuum device through a connection line for adsorbing and recovering the organic solvent in the gas,
• said gas treating apparatus comprising:
• an adsorption unit connected to the vacuum device and provided with a multistage fluidized bed of activated carbon for adsorbing the organic solvent in the gas;
• a desorption unit arranged side by side with the adsorption unit and provided with a moving bed of the activated carbon for desorbing the organic solvent from the activated carbon, said desorption unit being further provided with a heating means for heating the activated carbon of the moving bed and a gas supply means for supplying a carrier gas for carrying away a desorbed solvent gas out of the moving bed;
• a first transfer means having one end connected to a bottom portion of the adsorption unit and another end connected to an upper portion of the desorption unit for transferring the activated carbon from the adsorption unit to the desorption unit;
• and
• a second transfer means having one end connected to a bottom portion of the desorption unit and another end connected to an upper portion of the adsorption unit for transferring the activated carbon from the desorption unit to the adsorption unit, wherein the activated carbon is circulated between said adsorption unit and said desorption unit through said first and second transfer means.