| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cleaning contaminated soil, a slurry or the like, capable of desorbing hydrophobic organic matter from solid phase at the normal temperature under atomospheric pressure by reduced energy. SOLUTION: A surfactant is added to a substance to be treated being a solid-liquid mixed phase in a reaction tank l and the substance 2 to be treated is irradiated with ultrasonic waves exerting vibtation and extraction action on the solid phase from the ultrasonic transmitter 11 arranged in the tank and the hydrophobic organic matter is transferred from the solid phase to the liquid phase by the vibtation and extraction action to be desorbed from the solid phase and, in such a state that the re-adsorption of the hydrophobic organic matter by the solid phase is prevented by the bonding of the surfactant with the hydrophobic organic matter, the substance 2 to be treated is subjected to solid-liquid separation treatment by the immersion type membrane separator 7 immersed in the tank to take the hydrophobic organic matter out of the tank along with a filtrate and a slurry containing the solid phase from which the hydrophobia organic matter is desorbed is taken out of the tank as a treated slurry.
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